理学博士, 東京大学

Extreme high vacuum

optical frequency standard

precision measurements

atom interferometer

Bose-Einstein condensation

laser cooling

atom optics

光周波数標準 極高真空

精密計測

原子干渉計

ボーズ・アインシュタイン凝縮

レーザー冷却

原子光学

Natural sciences, Semiconductors, optical and atomic physics

01 Oct. 2010
Institute for Laser Science, University of Electro-Communications, Professor

Mar. 1989
The University of Tokyo, Graduate School, Division of Science, 物理学専攻

Mar. 1986
The University of Tokyo, Graduate School, Division of Science, 物理学専攻

1984
The University of Tokyo, Faculty of Science, Department of Physics

01 Apr. 1977 - 31 Mar. 1980
神奈川県立湘南高等学校

Apr. 2024 - Present
東レ理科教育賞審査委員, 公益財団法人東レ科学振興会, Others

Apr. 2020 - Mar. 2023
編集委員, 応用物理学会 APEX/JJAP 編集委員会, Society

24 Oct. 2017
委員長, 量子慣性センサ研究委員会, Society

06 Aug. 2015
計量単位分科会専門委員, 国際計量研究連絡委員会 計量単位分科会, Others

29 Jan. 2015
電磁波計測小委員会委員, 電気電子工学委員会 URSI 分科会 電磁波計測小委員会, Government

2000 - 2002
誌編集委員, 日本物理学会, Society

1999 - 2002
研究会委員, レーザー学会, Society

1995 - 1997
誌編集委員, 応用物理学会, Society

Mar. 2004
1.55μｍ光通信帯13C2H2光周波数標準の確立の研究
応用物理学会第5回光・量子エレクトロニクス業績賞, 中川賢一;大苗敦
Japan society

1990
応用物理学会賞(論文賞)

Analysis of coherent dynamics of a Rydberg-atom quantum simulator
Hikaru Tamura; Tomotake Yamakoshi; Ken’ichi Nakagawa
Physical Review A, 101, 4, 043421-1-043421-8, 28 Apr. 2020, Peer-reviwed
Scientific journal, English

Optical–optical double-resonance dual-comb spectroscopy with pump-intensity modulation
AKIKO NISHIYAMA; YOSHIAKI NAKAJIMA; KEN’ICHI NAKAGAWA; ATSUSHI ONAE; HIROYUKI SASADA,AND KAORU; MINOSHIMA
Optics Express, Optical Society of America, 27, 37003, 05 Dec. 2019, Peer-reviwed
Scientific journal, English

量子技術のための単一冷却原子・イオンの操作
中川賢一
光学, 日本光学会, 47, 7, 276-282, 10 Jul. 2018, Peer-reviwed, Invited
Scientific journal, Japanese

High-Sensitivity Doppler-Free Optical-Optical Double-Resonance Dual-Comb Spectroscopy
Akiko Nishiyama; Ken'ichi Nakagawa; Hiroyuki Sasada; Atsushi Onae; Yoshiaki Nakajima; Kaoru Minoshima
CLEO:2018, SI, JW2A.156, May 2018, Peer-reviwed
International conference proceedings, English

Precise and highly-sensitive Doppler-free two-photon absorption dual-comb spectroscopy using pulse shaping and coherent averaging for fluorescence signal detection
AKIKO NISHIYAMA; YOSHIAKI NAKAJIMA; KEN’ICHI NAKAGAWA, AND; KAORU MINOSHIMA
Optics Express, Optical Society of America, 26, 8957-8967, 28 Mar. 2018, Peer-reviwed
Scientific journal, English

Developments of high frequency and intensity stabilized lasers for space gravitational wave detector DECIGO/B-DECIGO
Aru Suemasa; Ayumi Shimo-oku; Ken’ichi Nakagawa; Mitsuru Musha
CEAS Space Journal, Springer-Verlag Wien, 9, 4, 485-491, 01 Dec. 2017, Peer-reviwed
Scientific journal, English

Highly frequency-stabilized laser for space gravitational wave detector DECIGO/DPF
Aru Suemasa; Ken'Ichi Nakagawa; Mitsuru Musha
Proceedings of SPIE - The International Society for Optical Engineering, SPIE, 10563, 14 Nov. 2017
International conference proceedings, English

Optical frequency synthesizer for precision spectroscopy of Rydberg states of Rb atoms
Naoto Watanabe; Hikaru Tamura; Mitsuru Musha; Ken’ichi Nakagawa
Japanese Journal of Applied Physics 56, 112401 (2017), The Japan Society of Applied Physics, 56, 11, 112401-1-112401-5, 12 Oct. 2017, Peer-reviwed, We have developed an optical frequency synthesizer for the precision spectroscopy of highly excited Rydberg states of Rb atoms. This synthesizer can generate a widely tunable 480 nm laser light with an optical power of 150 mW and an absolute frequency uncertainty of less than 100 kHz using a high-repetition-rate (325 MHz) Er fiber-based optical frequency comb and a tunable frequency-doubled diode laser at 960 nm. We demonstrate the precision two-photon spectroscopy of the Rydberg states of ⁸⁷Rb atoms by observing the electromagnetically induced transparency in a vapor cell, and measure the absolute transition frequencies of ⁸⁷Rb to nD (n = 53–92) and nS (n = 60–90) Rydberg states with an uncertainty of less than 250 kHz. It is the first direct frequency measurements of these transitions using an optical frequency comb.
Scientific journal, English

Developments of highly frequency and intensity stabilized lasers for space gravitational wave detector decigo/pre-decigo
Aru Suemasa; Ayumi Shimo-Oku; Ken'Ichi Nakagawa; Mitsuru Musha
Proceedings of SPIE - The International Society for Optical Engineering, SPIE, 10562, 25 Sep. 2017, Peer-reviwed
International conference proceedings, English

Developments of highly frequency and intensity stabilized lasers for space gravitational wave detector: DECIGO
Aru Suemasa; Ayumi Shimo-oku; Ken'ichi Nakagawa; Mitsuru Musha
Optics InfoBase Conference Papers, OSA - The Optical Society, 2017, 2017
International conference proceedings, English

Modulation-free frequency-stabilized laser at 1.5 μm using a narrow-linewidth diode laser
Kazumichi Yoshii; Takuya Inamura; Hiroyuki Sagawa; Ken'ichi Nakagawa; Feng-Lei Hong
Optics InfoBase Conference Papers, OSA - The Optical Society, 2017, 2017
International conference proceedings, English

Generation of five phase-locked harmonics in the continuous wave regime and its potential application to arbitrary optical waveform synthesis
N. Sheeda Suhaimi; C. Ohae; T. Gavara; K. Nakagawa; F. -L. Hong; M. Katsuragawa
THIRD INTERNATIONAL CONFERENCE ON APPLICATIONS OF OPTICS AND PHOTONICS, 10453, 2017, Peer-reviwed
International conference proceedings, English

Ultrafast pulse train at a 125-THz repetition rate in the CW regime
C. Ohae; N. S. Suhaimi; T. Gavara; K. Nakagawa; F. L. Hong; K. Minoshima; M. Katsuragawa
Optics InfoBase Conference Papers, OSA - The Optical Society, 2017, 2017, Peer-reviwed
International conference proceedings, English

Doppler-free dual-comb spectroscopy of Rb using optical-optical double resonance technique
Akiko Nishiyama; Satoru Yoshida; Yoshiaki Nakajima; Hiroyuki Sasada; Ken'ichi Nakagawa; Atsushi Onae; Kaoru Minoshima
OPTICS EXPRESS, 24, 22, 25894-25904, Oct. 2016, Peer-reviwed
Scientific journal, English

Highly uniform holographic microtrap arrays for single atom trapping using a feedback optimization of in-trap fluorescence measurements
Hikaru Tamura; Tomoyuki Unakami; Jun He; Yoko Miyamoto; Ken'ichi Nakagawa
OPTICS EXPRESS, 24, 8, 8132-8141, Apr. 2016, Peer-reviwed
Scientific journal, English

Generation and application of five phase-locked harmonics in the continuous wave regime
C. Ohae; S. Suhaimi; T. Gavara; K. Nakagawa; F. -L. Hong; K. Minoshima; M. Katsuragawa
2016 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO), 2016, Peer-reviwed
International conference proceedings, English

Measurement of absolute transition frequencies of ⁸⁷Rb Rydberg states using optical frequency comb
Watanabe Naoto; Naka Nobunaga; Tamura Hikaru; Musha Mitsuru; Nakagawa Ken'ichi
Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 71, 576-576, 2016,

我々は、レーザー冷却の研究で用いるために可視から近赤外領域までの広帯域な光周波数基準光源の開発を行っている。この周波数基準光源はErファイバー光周波数コムを利用して実現をする。実用的な基準光源の一例として、初めに単一^87^Rb原子を用いた量子情報処理の研究のためのリドベルグ状態励起用基準光源の開発を行っている。本発表では、装置の評価のために^87^Rbリドベルグ状態の絶対周波数測定を行い、先行研究の結果と比較を行う。

Japanese

High efficiency loading of an optical microtrap array with single atom per site by using light-assisted collisions
Yamaguchi Yusuke; Tamura Hikaru; Nakagawa Ken'ichi
Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 71, 515-515, 2016,

我々は、光マイクロトラップ内の単一中性原子とリドベルグブロッケード効果を用いて、量子情報処理および量子シミュレーションへの応用に向けた研究を行っている。我々は光マイクロトラップ内への単一原子ローディングの方法として青方離調光による光誘起衝突を利用してきた。本発表では、より高効率にトラップ内に単一原子を用意するために、青方離調光等の各種パラメータの最適化を図った結果を発表する予定である。

Japanese

Generation of five phase-locked harmonics by implementing a divide-by-three optical frequency divider
Nurul Sheeda Suhaimi; Chiaki Ohae; Trivikramarao Gavara; Ken'ichi Nakagawa; Feng Lei Hong; Masayuki Katsuragawa
OPTICS LETTERS, 40, 24, 5802-5805, Dec. 2015, Peer-reviwed
Scientific journal, English

Frequency Division in the Optical Frequency Region and Generation of Phase-locked High Harmonics
Hiaki Ohae; Nurul Sheeda Euhami Trivikramarao Gvara; Ken'ichi Nakagawa; Feng-Lei Hong; Masayuki Katsuragawa
The Review of Laser Engineering, レーザー学会, 43, 8, 517-520, 20 Aug. 2015, Peer-reviwed, Invited
Scientific journal, Japanese

23pDJ-3 Space Gravitational Wave Antenna DECIGO (61) : frequency-stabilized laser
Musha Mitsuru; Suemasa Aru; Nakagawa Ken'ichi; DECCIGO workgroup
Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 70, 461-461, 2015
Japanese

A watt-class narrow-linewidth mofpa system at 813 nm by using a tm3+ -doped fluoride fiber amplifier for the sr optical lattice clock
E. Kajikawa; Y. Takeuchi; K. Kohno; K. Nakagawa; M. Musha
Optics InfoBase Conference Papers, OSA - The Optical Society, 21 Jul. 2014
International conference proceedings, English

1 W single-frequency Tm-doped ZBLAN Fiber MOPA around 810nm
Kenta Kohno; Yu-ichi Takeuchi; Toshiyuki Kitamura; Ken'ichi Nakagawa; Ken-ichi Ueda; Mitsuru Musha
Optics Letter, Optical Society of America, 39, 2191-2193, 31 Mar. 2014, Peer-reviwed
Scientific journal, English

Transverse polarization structure of an optical vortex beam around the unfolding point in a birefringent crystal
Maruthi Manoj Brundavanam; Yoko Miyamoto; Mitsuo Takeda; Ken'ichi Nakagawa
Fringe 2013 - 7th International Workshop on Advanced Optical Imaging and Metrology, springer berlin, 611-615, 2014
International conference proceedings, English

Engineering Transport by concatenated maps
Torben Schell; Mark Sadgrove; Ken'ichi Nakagawa; Sandro Wimberger
Fluctuaion and Noise Letters, 12, 134004, Jul. 2013, Peer-reviwed
Scientific journal, English

Development of an 813-nm Tm-doped ZBLAN fiber amplifier for the Sr optical lattice clock
Yu-ichi Takeuchi; Masanori Uehara; Kenta Kohno; Mitsuru Musha; Ken'ichi Nakagawa; Ken-ichi Ueda
2013 CONFERENCE ON AND INTERNATIONAL QUANTUM ELECTRONICS CONFERENCE LASERS AND ELECTRO-OPTICS EUROPE (CLEO EUROPE/IQEC), 2013, Peer-reviwed
International conference proceedings, English

Engineering quantum correlations to enhance transport in cold atoms
Mark Sadgrove; Torben Schell; Ken'ichi Nakagawa; Sandro Wimberger
PHYSICAL REVIEW A, 87, 1, 013631, Jan. 2013, Peer-reviwed
Scientific journal, English

Phase-selected momentum transport in ultra-cold atoms
Mark Sadgrove; Sandro Wimberger; Ken'ichi Nakagawa
Eur. Phys. J. D, 66, 155, Jul. 2012, Peer-reviwed
Scientific journal, English

Simple and Fast Production of Bose-Einstein Condensate in a 1 μm Cross-beam Dipole Trap
Sanjay Kumar; Shuuichi Hirai; Yuuki Suzuki; Masahide Kachi; Mark Sadgrove; Ken'ichi Nakagawa
J. Phys. Soc. Jpn., 81, 084004, Jul. 2012, Peer-reviwed
Scientific journal, English

Interferometer setup for the observation of polarization structure near the unfolding point of an optical vortex beam in a birefringent crystal
Maruthi M. Brundavanam; Yoko Miyamoto; Rakesh Kumar Singh; Dinesh N. Naik; Mitsuo Takeda; Ken'ichi Nakagawa
OPTICS EXPRESS, 20, 12, 13573-13581, Jun. 2012, Peer-reviwed
Scientific journal, English

Observation of spatial polarization structure near unfolding point of an optical vortex beam using a birefringent Mach-Zehnder interferometer
Maruthi M. Brundavanam; Yoko Miyamoto; Rakesh K. Singh; Dinesh N. Naik; Mitsuo Takeda; Ken'ichi Nakagawa
NATURE OF LIGHT: LIGHT IN NATURE IV, 8480, 2012, Peer-reviwed
International conference proceedings, English

Fast, externally triggered, digital phase controller for an optical lattice
Mark Sadgrove; Ken'ichi Nakagawa
REVIEW OF SCIENTIFIC INSTRUMENTS, 82, 11, 113104, Nov. 2011, Peer-reviwed
Scientific journal, English

Precision timing and Rf signal dissemination for XFEL by delivering optical frequency comb through length-stabilized fiber
Mitsuru Musha; Toshio Ryuo; Ken'ichi Nakagawa; Ken-Ichi Ueda
2011 30th URSI General Assembly and Scientific Symposium, URSIGASS 2011, 2011, Peer-reviwed
International conference proceedings, English

Developments of the light source for DECIGO and DPF
Mitsuru Musha; Ken'Ichi Nakagawa; Ken-Ichi Ueda
2011 International Conference on Space Optical Systems and Applications, ICSOS'11, 378-380, 2011, Peer-reviwed
International conference proceedings, English

Multiparticle entanglement in a one-dimensional optical lattice using Rydberg-atom interactions
Zhanchun Zuo; Ken'ichi Nakagawa
PHYSICAL REVIEW A, 82, 6, 062328, Dec. 2010, Peer-reviwed
Scientific journal, English

Demonstration of Rydberg blockade between atoms in an optical lattice
Zhanchun Zuo; Tomoki Watanabe; Miho Fukusen; Daisuke Okuyama; Shuichi Hirai; Ken'ichi Nakagawa
22nd International Conference on Atomic Physics, 522, Jul. 2010
International conference proceedings, English

Single atom Rydberg excitation in a small dipole trap
Zhanchun Zuo; Miho Fukusen; Yoshihito Tamaki; Tomoki Watanabe; Yusuke Nakagawa; Ken'ichi Nakagawa
OPTICS EXPRESS, 17, 25, 22898-22905, Dec. 2009, Peer-reviwed
Scientific journal, English

Noise-Induced Energy Resonance for Atoms in a Periodic Potential
Mark Sadgrove; Sanjay Kumar; Ken'ichi Nakagawa
PHYSICAL REVIEW LETTERS, 103, 1, 010403, Jul. 2009, Peer-reviwed
Scientific journal, English

Novel applications of atom optics using a Bose-Einstein condensate in a time dependent potential
Mark Sadgrove; Sanjay Kumar; Ken'ichi Nakagawa
The 19th International Conference on Laser Spectroscopy (ICOLS), 1, Jun. 2009
International conference proceedings, English

RABI OSCILLATIONS WITH THE RYDBERG INTERACTIONS OF FEW COLD RB ATOMS IN A DIPOLE TRAP
Zhanchun Zuo; Miho Fukusen; Tomoki Watanabe; Shuichi Hirai; Ken'ichi Nakagawa
The 19th International Conference on Laser Spectroscopy (ICOLS), Kussharo, 2, Jun. 2009
International conference proceedings, English

Signal analysis with atom optics
Mark Sadgrove; Sanjay Kumar; Ken'ichi Nakagawa
PHYSICAL REVIEW A, 79, 5, 053618, May 2009
Scientific journal, English

Measuring frequency of Sr optical lattice clock with 120-km coherent optical transfer
F.-L. Hong; M. Musha; M. Takamoto; H. Inaba; S. Yanagimachi; A. Takamizawa; K. Watabe; T. Ikegami; M. Imae; Y. Fujii; M. Amemiya; K. Nakagawa; K. Ueda; H. Katori
Optics Letters, 34, 2009, Feb. 2009, Peer-reviwed
Scientific journal, English

Frequency Measurement of a Sr Optical Lattice Clock Using a Coherent Optical Link over a 120-km Fiber
F. -L. Hong; M. Musha; M. Takamoto; H. Inaba; S. Yanagimachi; A. Takamizawa; K. Watabe; T. Ikegami; M. Imae; Y. Fujii; M. Amemiya; K. Nakagawa; K. Ueda; H. Katori
2009 CONFERENCE ON LASERS AND ELECTRO-OPTICS AND QUANTUM ELECTRONICS AND LASER SCIENCE CONFERENCE (CLEO/QELS 2009), VOLS 1-5, 305-+, 2009, Peer-reviwed
International conference proceedings, English

Atom interferometer using a free oscillation of Bose-Einstein Condensate on an atom chip
Ken Ichinakagawa; Munekazu Horikoshi
Journal of Physics: Conference Series, Institute of Physics Publishing, 185, 012031, 2009, Peer-reviwed
International conference proceedings, English

Coherent optical frequency transfer over 50-km physical distance using a 120-km-long installed telecom fiber network
Mitsuru Musha; Feng-Lei Hong; Ken'ichi Nakagawa; Ken-ichi Ueda
OPTICS EXPRESS, 16, 21, 16459-16466, Oct. 2008, Peer-reviwed
Scientific journal, English

Enhanced Factoring with a Bose-Einstein Condensate
Mark Sadgrove; Sanjay Kumar; Ken'ichi Nakagawa
PHYSICAL REVIEW LETTERS, 101, 18, 180502, Oct. 2008, Peer-reviwed
Scientific journal, English

Study of the Rydberg state excitation of few cold Rb atoms in a dipole trap
K. Nakagawa; Z. Zuo; M. Fukusen; Y. Tamaki; T. Watanabe
International Conference on Atomic Physics 2008, 111, Jul. 2008
International conference proceedings, English

Fiber length stabilization system for Long-Baseline Phased-array Radio Telescopes (ALMA)
Mitsuru Musha; Ken'ichi Nakagawa; Ken-ichi Ueda; Masato Ishiguiro; Akitoshi Ueda
2008 CONFERENCE ON LASERS AND ELECTRO-OPTICS & QUANTUM ELECTRONICS AND LASER SCIENCE CONFERENCE, VOLS 1-9, 610-+, 2008, Peer-reviwed
International conference proceedings, English

Coherent control of ballistic energy growth for a kicked Bose-Einstein condensate
M. Sadgrove; M. Horikoshi; T. Sekimura; K. Nakagawa
EUROPEAN PHYSICAL JOURNAL D, 45, 2, 229-234, Nov. 2007, Peer-reviwed
Scientific journal, English

Suppression of dephasing due to a trapping potential and atom-atom interactions in a trapped-condensate interferometer
Munekazu Horikoshi; Ken'ichi Nakagawa
PHYSICAL REVIEW LETTERS, 99, 18, 180401, Nov. 2007, Peer-reviwed
Scientific journal, English

Rectified momentum transport for a kicked Bose-Einstein condensate
Mark Sadgrove; Munekazu Horikoshi; Tetsuo Sekimura; Ken'ichi Nakagawa
PHYSICAL REVIEW LETTERS, 99, 4, 043002, Jul. 2007, Peer-reviwed
Scientific journal, English

Bose-Einstein-Condensate Interferometer on an Atom Chip with a Long Coherence Time
Ken'ichi Nakagawa; Munekazu Horikoshi
18th International Conference on Laser Spectroscopy, 111, Jun. 2007
International conference proceedings, English

Practical optical frequency measurement system around 1.5 μm based on an acetylene-stabilized laser-locked optical frequency comb
Mitsuru Musha; Yosuke Tamura; Ken'ichi Nakagawa; Ken-ichi Ueda
Optics Communications, 274, 211-216, Feb. 2007, Peer-reviwed
Scientific journal, English

Results of the search for inspiraling compact star binaries from TAMA300's observation in 2000-2004
Tomomi Akutsu; Tomotada Akutsu; Masaki Ando; Koji Arai; Akito Araya; Hideki Asada; Youichi Aso; Mark A. Barton; Peter Beyersdorf; Youhei Fujiki; Masa-Katsu Fujimoto; Ryuichi Fujita; Mitsuhiro Fukushima; Toshifumi Futamase; Yusaku Hamuro; Tomiyoshi Haruyama; Hideaki Hayakawa; Kazuhiro Hayama; Gerhard Heinzel; Gen'ichi Horikoshi; Hideo Iguchi; Yukiyoshi Iida; Kunihito Ioka; Hideki Ishitsuka; Norihiko Kamikubota; Nobuyuki Kanda; Takaharu Kaneyama; Yoshikazu Karasawa; Kunihiko Kasahara; Taketoshi Kasai; Mayu Katsuki; Keita Kawabe; Mari Kawamura; Seiji Kawamura; Nobuki Kawashima; Fumiko Kawazoe; Yasufumi Kojima; Keiko Kokeyama; Kazuhiro Kondo; Yoshihide Kozai; Hideaki Kudoh; Kazuaki Kuroda; Takashi Kuwabara; Namio Matsuda; Norikatsu Mio; Kazuyuki Miura; Osamu Miyakawa; Shoken Miyama; Shinji Miyoki; Hiromi Mizusawa; Shigenori Moriwaki; Mitsuru Musha; Shigeo Nagano; Yoshitaka Nagayama; Ken'ichi Nakagawa; Takashi Nakamura; Hiroyuki Nakano; Ken-ichi Nakao; Yuhiko Nishi; Kenji Numata; Yujiro Ogawa; Masatake Ohashi; Naoko Ohishi; Akira Okutomi; Ken-ichi Oohara; Shigemi Otsuka; Norichika Sago; Yoshio Saito; Shihori Sakata; Misao Sasaki; Kouichi Sato; Nobuaki Sato; Shuichi Sato; Youhei Sato; Hidetsugu Seki; Aya Sekido; Naoki Seto; Masaru Shibata; Hisaaki Shinkai; Takakazu Shintomi; Kenji Soida; Kentaro Somiya; Toshikazu Suzuki; Hideyuki Tagoshi; Hirotaka Takahashi; Ryutaro Takahashi; Akiteru Takamori; Shuzo Takemoto; Kohei Takeno; Takahiro Tanaka; Keisuke Taniguchi; Shinsuke Taniguchi; Toru Tanji; Daisuke Tatsumi; C. T. Taylor; Souichi Telada; Kuniharu Tochikubo; Masao Tokunari; Takayuki Tomaru; Kimio Tsubono; Nobuhiro Tsuda; Yoshiki Tsunesada; Takashi Uchiyama; Akitoshi Ueda; Ken-ichi Ueda; Fumihiko Usui; Koichi Waseda; Yuko Watanabe; Hiromi Yakura; Akira Yamamoto; Kazuhiro Yamamoto; Toshitaka Yamazaki; Yuriko Yanagi; Tatsuo Yoda; Jun'ichi Yokoyama; Tatsuru Yoshida; Zong-Hong Zhu
PHYSICAL REVIEW D, 74, 12, 122002, Dec. 2006, Peer-reviwed
Scientific journal, English

Dephasing due to atom-atom interaction in a waveguide interferometer using a Bose-Einstein condensate
Munekazu Horikoshi; Ken'ichi Nakagawa
PHYSICAL REVIEW A, 74, 3, 031602(R), Sep. 2006, Peer-reviwed
Scientific journal, English

Joint LIGO and TAMA300 search for gravitational waves from inspiralling neutron star binaries
B. Abbott; R. Abbott; R. Adhikari; A. Ageev; J. Agresti; P. Ajith; B. Allen; J. Allen; R. Amin; S. B. Anderson; W. G. Anderson; M. Araya; H. Armandula; M. Ashley; F. Asiri; P. Aufmuth; C. Aulbert; S. Babak; R. Balasubramanian; S. Ballmer; B. C. Barish; C. Barker; D. Barker; M. Barnes; B. Barr; M. A. Barton; K. Bayer; R. Beausoleil; K. Belczynski; R. Bennett; S. J. Berukoff; J. Betzwieser; B. Bhawal; I. A. Bilenko; G. Billingsley; E. Black; K. Blackburn; L. Blackburn; B. Bland; B. Bochner; L. Bogue; R. Bork; S. Bose; P. R. Brady; V. B. Braginsky; J. E. Brau; D. A. Brown; A. Bullington; A. Bunkowski; A. Buonanno; R. Burgess; D. Busby; W. E. Butler; R. L. Byer; L. Cadonati; G. Cagnoli; J. B. Camp; J. Cannizzo; K. Cannon; C. A. Cantley; J. Cao; L. Cardenas; K. Carter; M. M. Casey; J. Castiglione; A. Chandler; J. Chapsky; P. Charlton; S. Chatterji; S. Chelkowski; Y. Chen; V. Chickarmane; D. Chin; N. Christensen; D. Churches; T. Cokelaer; C. Colacino; R. Coldwell; M. Coles; D. Cook; T. Corbitt; D. Coyne; J. D. E. Creighton; T. D. Creighton; D. R. M. Crooks; P. Csatorday; B. J. Cusack; C. Cutler; J. Dalrymple; E. D'Ambrosio; K. Danzmann; G. Davies; E. Daw; D. DeBra; T. Delker; V. Dergachev; S. Desai; R. DeSalvo; S. Dhurandhar; A. Di Credico; M. Diaz; H. Ding; R. W. P. Drever; R. J. Dupuis; J. A. Edlund; P. Ehrens; E. J. Elliffe; T. Etzel; M. Evans; T. Evans; S. Fairhurst; C. Fallnich; D. Farnham; M. M. Fejer; T. Findley; M. Fine; L. S. Finn; K. Y. Franzen; A. Freise; R. Frey; P. Fritschel; V. V. Frolov; M. Fyffe; K. S. Ganezer; J. Garofoli; J. A. Giaime; A. Gillespie; K. Goda; L. Goggin; G. Gonzalez; S. Gossler; P. Grandclement; A. Grant; C. Gray; A. M. Gretarsson; D. Grimmett; H. Grote; S. Grunewald; M. Guenther; E. Gustafson; R. Gustafson; W. O. Hamilton; M. Hammond; C. Hanna; J. Hanson; C. Hardham; J. Harms; G. Harry; A. Hartunian; J. Heefner; Y. Hefetz; G. Heinzel; I. S. Heng; M. Hennessy; N. Hepler; A. Heptonstall; M. Heurs; M. Hewitson; S. Hild; N. Hindman; P. Hoang; J. Hough; M. Hrynevych; W. Hua; M. Ito; Y. Itoh; A. Ivanov; O. Jennrich; B. Johnson; W. W. Johnson; W. R. Johnston; D. I. Jones; G. Jones; L. Jones; D. Jungwirth; V. Kalogera; E. Katsavounidis; K. Kawabe; W. Kells; J. Kern; A. Khan; S. Killbourn; C. J. Killow; C. Kim; C. King; P. King; S. Klimenko; S. Koranda; K. Koetter; J. Kovalik; D. Kozak; B. Krishnan; M. Landry; J. Langdale; B. Lantz; R. Lawrence; A. Lazzarini; M. Lei; I. Leonor; K. Libbrecht; A. Libson; P. Lindquist; S. Liu; J. Logan; M. Lormand; M. Lubinski; H. Lueck; M. Luna; T. T. Lyons; B. Machenschalk; M. MacInnis; M. Mageswaran; K. Mailand; W. Majid; M. Malec; V. Mandic; F. Mann; A. Marin; S. Marka; E. Maros; J. Mason; K. Mason; O. Matherny; L. Matone; N. Mavalvala; R. McCarthy; D. E. McClelland; M. McHugh; J. W. C. McNabb; A. Melissinos; G. Mendell; R. A. Mercer; S. Meshkov; E. Messaritaki; C. Messenger; E. Mikhailov; S. Mitra; V. P. Mitrofanov; G. Mitselmakher; R. Mittleman; O. Miyakawa; S. Mohanty; G. Moreno; K. Mossavi; G. Mueller; S. Mukherjee; P. Murray; E. Myers; J. Myers; S. Nagano; T. Nash; R. Nayak; G. Newton; F. Nocera; J. S. Noel; P. Nutzman; T. Olson; B. O'Reilly; D. J. Ottaway; A. Ottewill; D. Ouimette; H. Overmier; B. J. Owen; Y. Pan; M. A. Papa; V. Parameshwaraiah; C. Parameswariah; M. Pedraza; S. Penn; M. Pitkin; M. Plissi; R. Prix; V. Quetschke; F. Raab; H. Radkins; R. Rahkola; M. Rakhmanov; S. R. Rao; K. Rawlins; S. Ray-Majumder; V. Re; D. Redding; M. W. Regehr; T. Regimbau; S. Reid; K. T. Reilly; K. Reithmaier; D. H. Reitze; S. Richman; R. Riesen; K. Riles; B. Rivera; A. Rizzi; D. I. Robertson; N. A. Robertson; C. Robinson; L. Robison; S. Roddy; A. Rodriguez; J. Rollins; J. D. Romano; J. Romie; H. Rong; D. Rose; E. Rotthoff; S. Rowan; A. Ruediger; L. Ruet; P. Russell; K. Ryan; I. Salzman; V. Sandberg; G. H. Sanders; V. Sannibale; P. Sarin; B. Sathyaprakash; P. R. Saulson; R. Savage; A. Sazonov; R. Schilling; K. Schlaufman; V. Schmidt; R. Schnabel; R. Schofield; B. F. Schutz; P. Schwinberg; S. M. Scott; S. E. Seader; A. C. Searle; B. Sears; S. Seel; F. Seifert; D. Sellers; A. S. Sengupta; C. A. Shapiro; P. Shawhan; D. H. Shoemaker; Q. Z. Shu; A. Sibley; X. Siemens; L. Sievers; D. Sigg; A. M. Sintes; J. R. Smith; M. Smith; M. R. Smith; P. H. Sneddon; R. Spero; O. Spjeld; G. Stapfer; D. Steussy; K. A. Strain; D. Strom; A. Stuver; T. Summerscales; M. C. Sumner; M. Sung; P. J. Sutton; J. Sylvestre; D. B. Tanner; H. Tariq; M. Tarallo; I. Taylor; R. Taylor; R. Taylor; K. A. Thorne; K. S. Thorne; M. Tibbits; S. Tilav; M. Tinto; K. V. Tokmakov; C. Torres; C. Torrie; G. Traylor; W. Tyler; D. Ugolini; C. Ungarelli; M. Vallisneri; M. van Putten; S. Vass; A. Vecchio; J. Veitch; C. Vorvick; S. P. Vyachanin; L. Wallace; H. Walther; H. Ward; R. Ward; B. Ware; K. Watts; D. Webber; A. Weidner; U. Weiland; A. Weinstein; R. Weiss; H. Welling; L. Wen; S. Wen; K. Wette; J. T. Whelan; S. E. Whitcomb; B. F. Whiting; S. Wiley; C. Wilkinson; P. A. Willems; P. R. Williams; R. Williams; B. Willke; A. Wilson; B. J. Winjum; W. Winkler; S. Wise; A. G. Wiseman; G. Woan; D. Woods; R. Wooley; J. Worden; W. Wu; I. Yakushin; H. Yamamoto; S. Yoshida; K. D. Zaleski; M. Zanolin; I. Zawischa; L. Zhang; R. Zhu; N. Zotov; M. Zucker; J. Zweizig; T. Akutsu; T. Akutsu; M. Ando; K. Arai; A. Araya; H. Asada; Y. Aso; P. Beyersdorf; Y. Fujiki; M. -K. Fujimoto; R. Fujita; M. Fukushima; T. Futamase; Y. Hamuro; T. Haruyama; K. Hayama; H. Iguchi; Y. Iida; K. Ioka; H. Ishitsuka; N. Kamikubota; N. Kanda; T. Kaneyama; Y. Karasawa; K. Kasahara; T. Kasai; M. Katsuki; S. Kawamura; M. Kawamura; F. Kawazoe; Y. Kojima; K. Kokeyama; K. Kondo; Y. Kozai; H. Kudoh; K. Kuroda; T. Kuwabara; N. Matsuda; N. Mio; K. Miura; S. Miyama; S. Miyoki; H. Mizusawa; S. Moriwaki; M. Musha; Y. Nagayama; K. Nakagawa; T. Nakamura; H. Nakano; K. Nakao; Y. Nishi; K. Numata; Y. Ogawa; M. Ohashi; N. Ohishi; A. Okutomi; K. Oohara; S. Otsuka; Y. Saito; S. Sakata; M. Sasaki; N. Sato; S. Sato; Y. Sato; K. Sato; A. Sekido; N. Seto; M. Shibata; H. Shinkai; T. Shintomi; K. Soida; K. Somiya; T. Suzuki; H. Tagoshi; H. Takahashi; R. Takahashi; A. Takamori; S. Takemoto; K. Takeno; T. Tanaka; K. Taniguchi; T. Tanji; D. Tatsumi; S. Telada; M. Tokunari; T. Tomaru; K. Tsubono; N. Tsuda; Y. Tsunesada; T. Uchiyama; K. Ueda; A. Ueda; K. Waseda; A. Yamamoto; K. Yamamoto; T. Yamazaki; Y. Yanagi; J. Yokoyama; T. Yoshida; Z. -H. Zhu
PHYSICAL REVIEW D, 73, 10, 102002, May 2006, Peer-reviwed
Scientific journal, English

Robust and precise fiber length correction system with digital phase-frequency discriminator for distribution of reference signals
Mitsuru Musha; Yohei Sato; Ken'ichi Nakagawa; Ken-ichi Ueda; Akitoshi Ueda; Masato Ishiguro
Applied Physics B, 82, 555-559, Mar. 2006, Peer-reviwed
Scientific journal, English

Developments of a fibre-MOPA system for the light source of the gravitational wave antenna
Mitsuru Musha; Jun-ichi Miura; Ken'ichi Nakagawa; Ken-ichi Ueda
Class. Quantum Grav., 23, S287-292, Mar. 2006, Peer-reviwed
Scientific journal, English

Atom Chip based fast production of Bose-Einstein condensate
Munekazu Horikoshi; Ken'ichi Nakagawa
Applied Physics B, 82, 363-366, Feb. 2006, Peer-reviwed
Scientific journal, English

Atom chip based fast production of Bose-Einstein condensate
M. Horikoshi; K. Nakagawa
Applied Physics B, 2, 362-6, Jan. 2006, Peer-reviwed
Scientific journal, English

Upper limits from the LIGO and TAMA detectors on the rate of gravitational-wave bursts
B Abbott; R Abbott; R Adhikari; A Ageev; J Agresti; P Ajith; B Allen; J Allen; R Amin; SB Anderson; WG Anderson; M Araya; H Armandula; M Ashley; F Asiri; P Aufmuth; C Aulbert; S Babak; R Balasubramanian; S Ballmer; BC Barish; C Barker; D Barker; M Barnes; B Barr; MA Barton; K Bayer; R Beausoleil; K Belczynski; R Bennett; SJ Berukoff; J Betzwieser; B Bhawal; IA Bilenko; G Billingsley; E Black; K Blackburn; L Blackburn; B Bland; B Bochner; L Bogue; R Bork; S Bose; PR Brady; VB Braginsky; JE Brau; DA Brown; A Bullington; A Bunkowski; A Buonanno; R Burgess; D Busby; WE Butler; RL Byer; L Cadonati; G Cagnoli; JB Camp; J Cannizzo; K Cannon; CA Cantley; J Cao; L Cardenas; K Carter; MM Casey; J Castiglione; A Chandler; J Chapsky; P Charlton; S Chatterji; S Chelkowski; Y Chen; Chickarmane, V; D Chin; N Christensen; D Churches; T Cokelaer; C Colacino; R Coldwell; M Coles; D Cook; T Corbitt; D Coyne; JDE Creighton; TD Creighton; DRM Crooks; P Csatorday; BJ Cusack; C Cutler; J Dalrymple; E D'Ambrosio; K Danzmann; G Davies; E Daw; D DeBra; T Delker; Dergachev, V; S Desai; R DeSalvo; S Dhurandhar; A Di Credico; M Diaz; H Ding; RWP Drever; RJ Dupuis; JA Edlund; P Ehrens; EJ Elliffe; T Etzel; M Evans; T Evans; S Fairhurst; C Fallnich; D Farnham; MM Fejer; T Findley; M Fine; LS Finn; KY Franzen; A Freise; R Frey; P Fritschel; VV Frolov; M Fyffe; KS Ganezer; J Garofoli; JA Giaime; A Gillespie; K Goda; L Goggin; G Gonzalez; S Gossler; P Grandclement; A Grant; C Gray; AM Gretarsson; D Grimmett; H Grote; S Grunewald; M Guenther; E Gustafson; R Gustafson; WO Hamilton; M Hammond; C Hanna; J Hanson; C Hardham; J Harms; G Harry; A Hartunian; J Heefner; Y Hefetz; G Heinzel; IS Heng; M Hennessy; N Hepler; A Heptonstall; M Heurs; M Hewitson; S Hild; N Hindman; P Hoang; J Hough; M Hrynevych; W Hua; M Ito; Y Itoh; A Ivanov; O Jennrich; B Johnson; WW Johnson; WR Johnston; DI Jones; G Jones; L Jones; D Jungwirth; Kalogera, V; E Katsavounidis; K Kawabe; W Kells; J Kern; A Khan; S Killbourn; CJ Killow; C Kim; C King; P King; S Klimenko; S Koranda; K Kotter; J Kovalik; D Kozak; B Krishnan; M Landry; J Langdale; B Lantz; R Lawrence; A Lazzarini; M Lei; Leonor, I; K Libbrecht; A Libson; P Lindquist; S Liu; J Logan; M Lormand; M Lubinski; H Luck; M Luna; TT Lyons; B Machenschalk; M MacInnis; M Mageswaran; K Mailand; W Majid; M Malec; Mandic, V; F Mann; A Marin; S Marka; E Maros; J Mason; K Mason; O Matherny; L Matone; N Mavalvala; R McCarthy; DE McClelland; M McHugh; JWC McNabb; A Melissinos; G Mendell; RA Mercer; S Meshkov; E Messaritaki; C Messenger; E Mikhailov; S Mitra; VP Mitrofanov; G Mitselmakher; R Mittleman; O Miyakawa; S Mohanty; G Moreno; K Mossavi; G Mueller; S Mukherjee; P Murray; E Myers; J Myers; S Nagano; T Nash; R Nayak; G Newton; F Nocera; JS Noel; P Nutzman; T Olson; B O'Reilly; DJ Ottaway; A Ottewill; D Ouimette; H Overmier; BJ Owen; Y Pan; MA Papa; Parameshwaraiah, V; C Parameswariah; M Pedraza; S Penn; M Pitkin; M Plissi; R Prix; Quetschke, V; F Raab; H Radkins; R Rahkola; M Rakhmanov; Rao, SR; K Rawlins; S Ray-Majumder; Re, V; D Redding; MW Regehr; T Regimbau; S Reid; KT Reilly; K Reithmaier; DH Reitze; S Richman; R Riesen; K Riles; B Rivera; A Rizzi; DI Robertson; NA Robertson; C Robinson; L Robison; S Roddy; A Rodriguez; J Rollins; JD Romano; J Romie; H Rong; D Rose; E Rotthoff; S Rowan; A Rudiger; L Ruet; P Russell; K Ryan; Salzman, I; Sandberg, V; GH Sanders; Sannibale, V; P Sarin; B Sathyaprakash; PR Saulson; R Savage; A Sazonov; R Schilling; K Schlaufman; Schmidt, V; R Schnabel; R Schofield; BF Schutz; P Schwinberg; SM Scott; SE Seader; AC Searle; B Sears; S Seel; F Seifert; D Sellers; AS Sengupta; CA Shapiro; P Shawhan; DH Shoemaker; QZ Shu; A Sibley; Siemens, X; L Sievers; D Sigg; AM Sintes; Smith, JR; M Smith; MR Smith; PH Sneddon; R Spero; O Spjeld; G Stapfer; D Steussy; KA Strain; D Strom; A Stuver; T Summerscales; MC Sumner; M Sung; PJ Sutton; J Sylvestre; DB Tanner; H Tariq; M Tarallo; Taylor, I; R Taylor; R Taylor; KA Thorne; KS Thorne; M Tibbits; S Tilav; M Tinto; KV Tokmakov; C Torres; C Torrie; G Traylor; W Tyler; D Ugolini; C Ungarelli; M Vallisneri; M van Putten; S Vass; A Vecchio; J Veitch; C Vorvick; SP Vyachanin; L Wallace; H Walther; H Ward; R Ward; B Ware; K Watts; D Webber; A Weidner; U Weiland; A Weinstein; R Weiss; H Welling; L Wen; S Wen; K Wette; JT Whelan; SE Whitcomb; BF Whiting; S Wiley; C Wilkinson; PA Willems; PR Williams; R Williams; B Willke; A Wilson; BJ Winjum; W Winkler; S Wise; AG Wiseman; G Woan; D Woods; R Wooley; J Worden; W Wu; Yakushin, I; H Yamamoto; S Yoshida; KD Zaleski; M Zanolin; Zawischa, I; L Zhang; R Zhu; N Zotov; M Zucker; J Zweizig; T Akutsu; T Akutsu; M Ando; K Arai; A Araya; H Asada; Y Aso; P Beyersdorf; Y Fujiki; MK Fujimoto; R Fujita; M Fukushima; T Futamase; Y Hamuro; T Haruyama; K Hayama; H Iguchi; Y Iida; K Ioka; H Ishizuka; N Kamikubota; N Kanda; T Kaneyama; Y Karasawa; K Kasahara; T Kasai; M Katsuki; S Kawamura; M Kawamura; F Kawazoe; Y Kojima; K Kokeyama; K Kondo; Y Kozai; H Kudoh; K Kuroda; T Kuwabara; N Matsuda; N Mio; K Miura; S Miyama; S Miyoki; H Mizusawa; S Moriwaki; M Musha; Y Nagayama; K Nakagawa; T Nakamura; H Nakano; K Nakao; Y Nishi; K Numata; Y Ogawa; M Ohashi; N Ohishi; A Okutomi; K Oohara; S Otsuka; Y Saito; S Sakata; M Sasaki; N Sato; S Sato; Y Sato; K Sato; A Sekido; N Seto; M Shibata; H Shinkai; T Shintomi; K Soida; K Somiya; T Suzuki; H Tagoshi; H Takahashi; R Takahashi; A Takamori; S Takemoto; K Takeno; T Tanaka; K Taniguchi; T Tanji; D Tatsumi; S Telada; M Tokunari; T Tomaru; K Tsubono; N Tsuda; Y Tsunesada; T Uchiyama; K Ueda; A Ueda; K Waseda; A Yamamoto; K Yamamoto; T Yamazaki; Y Yanagi; J Yokoyama; T Yoshida; ZH Zhu
PHYSICAL REVIEW D, 72, 12, 122004, Dec. 2005, Peer-reviwed
Scientific journal, English

Simple and efficient magnetic transport of cold atoms using moving coils for the production of Bose-Einstein condensation
K. Nakagawa; Y. Suzuki; M. Horikoshi; J. B. Kim
Appl. Phys. B, 81, 791-794, Sep. 2005, Peer-reviwed
Scientific journal, English

Atomic interferometer with cold rubidium atoms for the precision measurements of gravirational acceleration
Ken'ichi Nakagawa; Munekazu Horikoshi; Yusuke Koda
17th International Conference on Laser Spectroscopy, 111, Jun. 2005
International conference proceedings, English

Atom-chip-based fast production of Bose-Einstein condensate atoms
Munekazu Horikoshi; Ken'ichi Nakagawa
17th International Conference on Laser Spectroscopy, 111, Jun. 2005
International conference proceedings, English

Observation results by the TAMA300 detector on gravitational wave bursts from stellar-core collapses
M Ando; K Arai; Y Aso; P Beyersdorf; K Hayama; Y Iida; N Kanda; S Kawamura; K Kondo; N Mio; S Miyoki; S Moriwaki; S Nagano; K Numata; S Sato; K Somiya; H Tagoshi; H Takahashi; R Takahashi; D Tatsumi; Y Tsunesada; ZH Zhu; T Akutsu; T Akutsu; A Araya; H Asada; MA Barton; Y Fujiki; MK Fujimoto; R Fujita; M Fukushima; T Futamase; Y Hamuro; T Haruyama; H Hayakawa; G Heinzel; G Horikoshi; H Iguchi; K Ioka; H Ishitsuka; N Kamikubota; T Kaneyama; Y Karasawa; K Kasahara; T Kasai; M Katsuki; K Kawabe; M Kawamura; N Kawashima; F Kawazoe; Y Kojima; K Kokeyama; Y Kozai; H Kudoh; K Kuroda; T Kuwabara; N Matsuda; K Miura; O Miyakawa; S Miyama; H Mizusawa; M Musha; Y Nagayama; K Nakagawa; T Nakamura; H Nakano; K Nakao; Y Nishi; Y Ogawa; M Ohashi; N Ohishi; A Okutomi; K Oohara; S Otsuka; Y Saito; S Sakata; M Sasaki; K Sato; N Sato; Y Sato; H Seki; A Sekido; N Seto; M Shibata; H Shinkai; T Shintomi; K Soida; T Suzuki; A Takamori; S Takemoto; K Takeno; T Tanaka; K Taniguchi; S Taniguchi; T Tanji; CT Taylor; S Telada; K Tochikubo; M Tokunari; T Tomaru; K Tsubono; N Tsuda; T Uchiyama; A Ueda; K Ueda; F Usui; K Waseda; Y Watanabe; H Yakura; A Yamamoto; K Yamamoto; T Yamazaki; Y Yanagi; T Yoda; J Yokoyama; T Yoshida
PHYSICAL REVIEW D, 71, 8, 082002, Apr. 2005, Peer-reviwed
Scientific journal, English

Modulation-free acetylene-stabilized lasers at 1542nm using a modulation transfer spectroscopy
Ken'ichi Nakagawa; Youhei Sato; Mitsuru Musha; Ken-ichi Ueda
Appl. Phys. B, 80, 479-482, Feb. 2005, Peer-reviwed
Scientific journal, English

Large-mode-area erbium-ytterbium-doped photonic-crystal fiber amplifier for high-energy femtosecond pulses at 1.55 mu m
A Shirakawa; J Ota; M Musha; K Nakagawa; K Ueda; Folkenberg, JR; J Broeng
OPTICS EXPRESS, 13, 4, 1221-1227, Feb. 2005, Peer-reviwed
Scientific journal, English

Robust and precise length correction of 25-km fiber for distribution of local oscillator
M Musha; Y Sato; K Nakagawa; K Ueda; A Ueda; M Ishiguro
2005 Digest of the LEOS Summer Topical Meetings, 123-124, 2005, Peer-reviwed
International conference proceedings, English

An accurate optical frequency measurement system using an optical frequency comb and an acetylene-stabilized laser
Atsushi Onae; Feng-Lei Hong; Ken-Ichro Okumura; Hirokazu Matsumoto; Ken-Ichi Nakagawa; Yoshihiko Tachikawa
IET Conference Publications, Institution of Engineering and Technology, 2005, 502, 389-390, 2005, Peer-reviwed
International conference proceedings, English

Fast and efficient production of Bose-Einstein condensate atoms based on an atom chip
Munekazu Horikoshi; Yusuke Suzuki; KeN'Ich Nakagawa
IQEC, International Quantum Electronics Conference Proceedings, 2005, 1464-1465, 2005, Peer-reviwed
International conference proceedings, English

A highly stable mm-wave synthesizer realized by mixing two lasers locked to an optical frequency comb generator
Mitsuru Musha; Akitoshi Ueda; Munekazu Horikoshi; Ken'ichi Nakagawa; Masato Ishiguro; Ken-ichi Ueda; Hiroshi Ito
Optics Communications, 240, 201-208, Aug. 2004, Peer-reviwed
Scientific journal, English

Frequency stabilization of a 1319-nm Nd : YAG laser by saturation spectroscopy of molecular iodine
RX Guo; FL Hong; A Onae; ZY Bi; H Matsumoto; K Nakagawa
OPTICS LETTERS, 29, 15, 1733-1735, Aug. 2004, Peer-reviwed
Scientific journal, English

Coincidence analysis to search for inspiraling compact binaries using TAMA300 and LISM data
H Takahashi; H Tagoshi; M Ando; K Arai; P Beyersdorf; N Kanda; S Kawamura; N Mio; S Miyoki; S Moriwaki; K Numata; M Ohashi; M Sasaki; S Sato; R Takahashi; D Tatsumi; Y Tsunesada; A Araya; H Asada; Y Aso; MA Barton; MK Fujimoto; M Fukushima; T Futamase; T Haruyama; K Hayama; G Heinzel; G Horikoshi; Y Iida; K Ioka; H Ishitsuka; N Kamikubota; K Kasahara; K Kawabe; N Kawashima; Y Kojima; K Kondo; Y Kozai; K Kuroda; N Matsuda; K Miura; O Miyakawa; S Miyama; M Musha; S Nagano; K Nakagawa; T Nakamura; H Nakano; K Nakao; Y Nishi; Y Ogawa; N Ohishi; A Okutomi; K Oohara; S Otsuka; Y Saito; N Sato; H Seki; N Seto; M Shibata; T Shintomi; K Soida; K Somiya; T Suzuki; A Takamori; S Takemoto; K Takeno; T Tanaka; T Tanji; S Taniguchi; CT Taylor; S Telada; K Tochikubo; T Tomaru; Y Totsuka; K Tsubono; N Tsuda; T Uchiyama; A Ueda; K Ueda; F Usui; K Waseda; Y Watanabe; H Yakura; K Yamamoto; A Yamamoto; T Yamazaki; T Yoda; ZH Zhu
PHYSICAL REVIEW D, 70, 4, 042003, Aug. 2004, Peer-reviwed
Scientific journal, English

Present status of large-scale cryogenic gravitational wave telescope
T Uchiyama; K Kuroda; M Ohashi; S Miyoki; H Ishitsuka; K Yamamoto; H Hayakawa; K Kasahara; MK Fujimoto; S Kawamura; R Takahashi; T Yamazaki; K Arai; D Tatsumi; A Ueda; M Fukushima; S Sato; Y Tsunesada; ZH Zhu; T Shintomi; A Yamamoto; T Suzuki; Y Saito; T Haruyama; N Sato; Y Higashi; T Tomaru; K Tsubono; M Ando; K Numata; Y Aso; KI Ueda; H Yoneda; K Nakagawa; M Musha; N Mio; S Moriwaki; K Somiya; A Araya; A Takamori; N Kanda; S Telada; H Tagoshi; T Nakamura; M Sasaki; T Tanaka; KI Ohara; H Takahashi; S Nagano; O Miyakawa; ME Tobar
CLASSICAL AND QUANTUM GRAVITY, 21, 5, S1161-S1172, Mar. 2004, Peer-reviwed
Scientific journal, English

Optical generation of a highly stable millimeter wave by heterodyning of two phase-locked diode lasers with an optical comb generator
Mitsuru Musha; Ken'ichi Nakagawa; Ken-Ichi Ueda; Akitoshi Ueda; Masato Ishiguro
OSA Trends in Optics and Photonics Series, Optical Society of American (OSA), 96, 593-594, 2004
International conference proceedings, English

Accurate frequency atlas of 1.5 μm band of acetylene measured by a mode-locked fiber laser
A. Onae; K. Okumura; F. L. Hong; H. Matsumoto; K. Nakagawa
CPEM Digest (Conference on Precision Electromagnetic Measurements), 666-667, 2004, Peer-reviwed
International conference proceedings, English

Developments of Optical Frequency Standards for Wavelength-division-multiplexing (WDM) Optical Fiber Communication Systems
Ken'ichi Nakagawa; Atsushi Onae
The transactions of the Institute of Electrical Engineers of Japan.A, 124, 1, 52-55, 2004, Peer-reviwed
Scientific journal, English

Absolute frequency measurement of an acetylene-stabilized laser at 1542 nm
FL Hong; A Onae; J Jiang; RX Guo; H Inaba; K Minoshima; TR Schibli; H Matsumoto; K Nakagawa
OPTICS LETTERS, 28, 23, 2324-2326, Dec. 2003, Peer-reviwed
Scientific journal, English

Current status of large-scale cryogenic gravitational wave telescope
K Kuroda; M Ohashi; S Miyoki; T Uchiyama; H Ishitsuka; K Yamamoto; K Kasahara; MK Fujimoto; S Kawamura; R Takahashi; T Yamazaki; K Arai; D Tatsmui; A Ueda; M Fukushima; S Sato; S Nagano; Y Tsunesada; ZH Zhu; T Shintomi; A Yamamoto; T Suzuki; Y Saito; T Haruyama; N Sato; Y Higashi; T Tomaru; K Tsubono; M Ando; A Takamori; K Numata; Y Aso; KI Ueda; H Yoneda; K Nakagawa; M Musha; N Mio; S Moriwaki; K Somiya; A Araya; N Kanda; S Telada; H Tagoshi; T Nakamura; M Sasaki; T Tanaka; K Oohara; H Takahashi; O Miyakawa; ME Tobar
CLASSICAL AND QUANTUM GRAVITY, 20, 17, S871-S884, Sep. 2003, Peer-reviwed
Scientific journal, English

光通信帯の高精度光周波数標準
中川賢一
レーザー研究, 31, 7, 433-437, Jul. 2003, Peer-reviwed
Scientific journal, Japanese

Frequency stabilization of a Nd: YAG laser at 660 nm
Ruixiang Guo; Zhi-Yi Bi; Jun Ishikawa; Atsushi Onae; Hirokazu Matsumoto; Feng-Lei Hong; Ken'ichi Nakagawa
OSA Trends in Optics and Photonics Series, Optical Society of American (OSA), 88, 2074-2075, 2003
International conference proceedings, English

OPTICAL FREQUENCY STANDARD AT 1.5 μm BASED ON DOPPLER-FREE ACETYLENE ABSORPTION
A. Onae; K. Okumura; K. Sugiyama; F-L. Hong; H. Matsumoto; K. Nakagawa; R. Felder; O. Acef
Proceedings of the 6th Symposium on FREQUENCY STANDARDS AND METROLOGY, World Scientific, 445, 2003, Peer-reviwed
International conference proceedings, English

Stable magnetic trap for the production of 87Rb condensates
Ken'ichi Nakagawa; Munekazu Horikoshi; Takayuki Iio; Yamao Nakajima
ICAP (International Conference on Atomic Physics) 2002, Aug. 2002
English

DEVELOPMENT OF OPTICAL FREQUENCY STANDARDS IN THE 1.5 MICRON REGION FOR WDM OPTICAL COMMUNICATION SYSTEMS
Ken'ichi Nakagawa; Atsushi Onae
URSI (International Union of Radio Science) XXVIIth General Assembly (invited talk), 1, Aug. 2002
International conference proceedings, English

Development of a light source with an injection-locked Nd : YAG laser and a ring-mode cleaner for the TAMA 300 gravitational-wave detector
S Nagano; MA Barton; H Ishizuka; K Kuroda; S Matsumura; O Miyakawa; S Miyoki; D Tatsumi; T Tomaru; T Uchiyama; M Ando; K Arai; K Kawabe; N Ohishi; A Takamori; S Taniguchi; K Tochikubo; K Tsubono; K Yamamoto; MK Fujimoto; M Fukushima; S Kawamura; Y Kozai; S Miyama; M Ohashi; S Sato; R Takahashi; S Telada; T Yamazaki; N Mio; S Moriwaki; G Horikoshi; N Kamikubota; Y Ogawa; Y Saito; T Suzuki; M Musha; K Nakagawa; A Ueda; K Ueda; A Araya; N Kanda; T Nakamura; T Tanaka; M Sasaki; H Tagoshi; T Futamase; N Kawashima; E Mizuno; Y Kojima; N Matsuda; K Oohara; N Tsuda
REVIEW OF SCIENTIFIC INSTRUMENTS, 73, 5, 2136-2142, May 2002, Peer-reviwed
Scientific journal, English

Japanese large-scale interferometers
K Kuroda; M Ohashi; S Miyoki; H Ishizuka; CT Taylor; K Yamamoto; O Miyakawa; MK Fujimoto; S Kawamura; R Takahashi; T Yamazaki; K Arai; D Tatsumi; A Ueda; M Fukushima; S Sato; T Shintomi; A Yamamoto; T Suzuki; Y Saito; T Haruyama; N Sato; Y Higashi; T Uchiyama; T Tomaru; K Tsubono; M Ando; A Takamori; K Numata; KI Ueda; H Yoneda; K Nakagawa; M Musha; N Mio; S Moriwaki; K Somiya; A Araya; N Kanda; S Telada; M Sasaki; H Tagoshi; T Nakamura; T Tanaka; K Ohara
CLASSICAL AND QUANTUM GRAVITY, 19, 7, 1237-1245, Apr. 2002, Peer-reviwed
Scientific journal, English

Optical frequency standard at 1.3 mu m and 659 nm based on an iodine-stabilzed Nd : YAG laser
FL Hong; ZY Bi; RX Guo; J Ishikawa; T Kurosu; A Onae; H Matsumoto; K Nakagawa
2002 CONFERENCE ON PRECISION ELECTROMAGNETIC MEASUREMENTS, CONFERENCE DIGEST, 572-573, 2002, Peer-reviwed
International conference proceedings, English

An accurate optical frequency measurement at telecommunication region
A Onae; K Okumura; K Sugiyama; FL Hong; J Ishikawa; H Matsumoto; K Nakagawa; R Felder; O Acef
2002 CONFERENCE ON PRECISION ELECTROMAGNETIC MEASUREMENTS, CONFERENCE DIGEST, 568-569, 2002, Peer-reviwed
International conference proceedings, English

波長分割多重(WDM)通信用の光周波数基準
中川賢一; 大苗 敦
応用物理, 70, 11, 1332-1333, Nov. 2001, Peer-reviwed
Scientific journal, Japanese

Intensity and frequency noise characteristics of two coherently-added injection-locked Nd : YAG lasers
M Musha; T Kanaya; K Nakagawa; KI Ueda
APPLIED PHYSICS B-LASERS AND OPTICS, 73, 3, 209-214, Sep. 2001
Scientific journal, English

Stable operation of a 300-m laser interferometer with sufficient sensitivity to detect gravitational-wave events within our galaxy
M Ando; K Arai; R Takahashi; G Heinzel; S Kawamura; D Tatsumi; N Kanda; H Tagoshi; A Araya; H Asada; Y Aso; MA Barton; MK Fujimoto; M Fukushima; T Futamase; K Hayama; G Horikoshi; H Ishizuka; N Kamikubota; K Kawabe; N Kawashima; Y Kobayashi; Y Kojima; K Kondo; Y Kozai; K Kuroda; N Matsuda; N Mio; K Miura; O Miyakawa; SM Miyama; S Miyoki; S Moriwaki; M Musha; S Nagano; K Nakagawa; T Nakamura; K Nakao; K Numata; Y Ogawa; M Ohashi; N Ohishi; S Okutomi; K Oohara; S Otsuka; Y Saito; M Sasaki; S Sato; A Sekiya; M Shibata; K Somiya; T Suzuki; A Takamori; T Tanaka; S Taniguchi; S Telada; K Tochikubo; T Tomaru; K Tsubono; N Tsuda; T Uchiyama; A Ueda; K Ueda; K Waseda; Y Watanabe; H Yakura; K Yamamoto; T Yamazaki
PHYSICAL REVIEW LETTERS, 86, 18, 3950-3954, Apr. 2001, Peer-reviwed
Scientific journal, English

First search for gravitational waves from inspiraling compact binaries using TAMA300 data
H Tagoshi; N Kanda; T Tanaka; D Tatsumi; S Telada; M Ando; K Arai; A Araya; H Asada; MA Barton; MK Fujimoto; M Fukushima; T Futamase; G Heinzel; G Horikoshi; H Ishizuka; N Kamikubota; K Kawabe; S Kawamura; N Kawashima; Y Kojima; Y Kozai; K Kuroda; N Matsuda; S Matsumura; S Miki; N Mio; O Miyakawa; S Miyama; S Miyoki; E Mizuno; S Moriwaki; M Musha; S Nagano; K Nakagawa; T Nakamura; K Nakao; K Numata; Y Ogawa; M Ohashi; N Ohishi; A Okutomi; K Oohara; S Otsuka; Y Saito; M Sasaki; S Sato; A Sekiya; M Shibata; K Shirakata; K Somiya; T Suzuki; R Takahashi; A Takamori; S Taniguchi; K Tochikubo; T Tomaru; K Tsubono; N Tsuda; T Uchiyama; A Ueda; K Ueda; K Ueda; K Waseda; Y Watanabe; H Yakura; K Yamamoto; T Yamazaki
PHYSICAL REVIEW D, 63, 6, 062001-1, Mar. 2001, Peer-reviwed
Scientific journal, English

Frequency reproducibility of I-2-stabilized Nd : YAG lasers
FL Hong; Y Zhang; J Ishikawa; Y Bitou; A Onae; J Yoda; H Matsumoto; K Nakagawa
LASER FREQUENCY STABILIZATION, STANDARDS, MEASUREMENT AND APPLICATIONS, 4269, 143-154, 2001, Peer-reviwed
International conference proceedings, English

Coherent addition of two injection-locked Nd : YAG lasers
M Musha; T Kanaya; K Nakagawa; K Ueda
CLEO(R)/PACIFIC RIM 2001, VOL I, TECHNICAL DIGEST, 552-553, 2001, Peer-reviwed
International conference proceedings, English

Development of an acetylene optical frequency standard at 1.5 mu m and its applications
K Nakagawa; A Onae
LASER FREQUENCY STABILIZATION, STANDARDS, MEASUREMENT AND APPLICATIONS, 4269, 41-49, 2001
International conference proceedings, English

Optical frequency link between an acetylene stabilized laser at 1542 nm and an Rb stabilized laser at 778 nm using a two-color mode-locked fiber laser
A Onae; T Ikegami; K Sugiyama; FL Hong; K Minoshima; H Matsumoto; K Nakagawa; M Yoshida; S Harada
OPTICS COMMUNICATIONS, 183, 1-4, 181-187, Sep. 2000, Peer-reviwed
Scientific journal, English

The short- and long-term frequency stabilization of an injection-locked Nd : YAG laser in reference to a Fabry-Perot cavity and an iodine saturated absorption line
M Musha; T Kanaya; K Nakagawa; K Ueda
OPTICS COMMUNICATIONS, 183, 1-4, 165-173, Sep. 2000, Peer-reviwed
Scientific journal, English

原子レーザーを用いたコヒーレント原子光学
中川賢一
レーザー研究, 28, 3, 160-165, Mar. 2000, Peer-reviwed
Scientific journal, Japanese

Frequency uncertainty of I-2-stabilized Nd : YAG lasers
FL Hong; J Ishikawa; A Onae; J Yoda; K Nakagawa
2000 CONFERENCE ON PRECISION ELECTROMAGNETIC MEASUREMENTS DIGEST, 675-676, 2000, Peer-reviwed
International conference proceedings, English

重力波検出用の超高安定化高出力固体レーザーシステム
武者満; 中川賢一; 植田憲一
レーザー研究, The Laser Society of Japan, 27, 7, 84-88, Jul. 1999, Peer-reviwed, A high-power and highly-frequency-stabilized laser has been developed for the laser interferometric gravitational wave detector. Requirements of the light source for this are a single transverseand longitudinal mode with the power and frequency noise of 10W and 10^-6Hz√Hz at 300 Hz, respectively. The frequency of a LD-pumped injection-locked Nd: YAG laser was stabilized to a high finesse Fabry-Perot optical resonator that was isolated from seismic and acoustic noise, which was achieved by controlling master laser light. We evaluated the mechanical and thermal stability of Fabry-Perot cavities of both rigid spacer type and the independently suspended mirrors type. Finally we have achieved the absolute frequency noise of2×10^-2Hz/√ Hz for an injection-locked high-power laser with the output power of 9.8 W.
Scientific journal, Japanese

Phase change of a probe due to oscillation of cold atoms in an optical standing wave
M Kozuma; K Nakagawa; W Jhe; M Ohtsu
PHYSICAL REVIEW A, 57, 1, R24-R27, Jan. 1998, Peer-reviwed
Scientific journal, English

Towards an accurate frequency standard at 1.5 mu m based on the acetylene overtone band transition
A Onae; K Okumura; J Yoda; K Nakagawa; A Yamaguchi; M Kourogi; K Imai
1998 CONFERENCE ON PRECISION ELECTROMAGNETIC MEASUREMENTS DIGEST, 48, 400-401, 1998, Peer-reviwed
International conference proceedings, English

Saturation spectroscopy of an acetylene molecule in the 1550 nm region using an erbium doped fiber amplifier
A Onae; K Okumura; Y Miki; T Kurosawa; E Sakuma; J Yoda; K Nakagawa
OPTICS COMMUNICATIONS, 142, 1-3, 41-44, Oct. 1997, Peer-reviwed
Scientific journal, English

Wideband and high frequency stabilization of an injection-locked Nd:YAG laser to a high-finesse Fabry-Perot cavity
M Musha; K Nakagawa; K Ueda
OPTICS LETTERS, 22, 15, 1177-1179, Aug. 1997, Peer-reviwed
Scientific journal, English

Measurement of frequency noise spectra of frequency-stabilized LD-pumped Nd:YAG laser by using a cavity with separately suspended mirrors
M Musha; S Telada; K Nakagawa; M Ohashi; K Ueda
OPTICS COMMUNICATIONS, 140, 4-6, 323-330, Aug. 1997, Peer-reviwed
Scientific journal, English

Observation of temporal behavior of an atomic wave packet localized in an optical potential - Reply
M Kozuma; K Nakagawa; W Jhe; M Ohtsu
PHYSICAL REVIEW LETTERS, 78, 13, 2677-2677, Mar. 1997, Peer-reviwed
Scientific journal, English

Frequency stabilization of an injection-locked Nd:YAG laser for the gravitational wave detection
Mitsuru Musha; Ken'ichi Nakagawa; Ken ichi Ueda
Pacific Rim Conference on Lasers and Electro-Optics, CLEO - Technical Digest, IEEE, 65-66, 1997
International conference proceedings, English

光ポテンシャル中の極低温原子の運動とその制御
中川賢一; 上妻幹男
日本物理学会誌, 51, 12, 908-911, Dec. 1996, Peer-reviwed
Scientific journal, Japanese

Accurate optical frequency atlas of the 1.5-mu m bands of acetylene
K Nakagawa; M deLabachelerie; Y Awaji; M Kourogi
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, 13, 12, 2708-2714, Dec. 1996
Scientific journal, English

Observation of temporal behavior of an atomic wave packet localized in an optical potential
M Kozuma; K Nakagawa; W Jhe; M Ohtsu
PHYSICAL REVIEW LETTERS, 76, 14, 2428-2431, Apr. 1996
Scientific journal, English

Observation of a transient response of recoil-induced resonance: A method for the measurement of atomic motion in an optical standing wave
M. Kozuma; Y. Imai; K. Nakagawa; M. Ohtsu
Physical Review A, American Physical Society (APS), 52, 5, R3421-R3424, 01 Nov. 1995, Peer-reviwed
Scientific journal

OBSERVATION OF A TRANSIENT-RESPONSE OF RECOIL-INDUCED RESONANCE - A METHOD FOR THE MEASUREMENT OF ATOMIC MOTION IN AN OPTICAL STANDING-WAVE
M KOZUMA; Y IMAI; K NAKAGAWA; M OHTSU
PHYSICAL REVIEW A, 52, 5, R3421-R3424, Nov. 1995
Scientific journal, English

OPTICAL FREQUENCY-MEASUREMENT OF THE (HCN)-C-12-N-14 LAMB-DIP-STABILIZED 1.5-MU-M DIODE-LASER
Y AWAJI; K NAKAGAWA; M DELABACHELERIE; H SASADA
OPTICS LETTERS, 20, 19, 2024-2026, Oct. 1995
Scientific journal, English

SHORT-TERM FREQUENCY STABILIZATION OF DIODE-LASER-PUMPED ND-YAG LASERS USING DOUBLE-PENDULUM SUSPENDED CAVITIES
K NAKAGAWA; T KATSUDA; M OHTSU
APPLIED PHYSICS B-LASERS AND OPTICS, 60, 5, 489-494, May 1995, Peer-reviwed
Scientific journal, English

HIGH-FREQUENCY-STABILITY LASER AT 1.5 MU-M USING DOPPLER-FREE MOLECULAR LINES
M DELABACHELERIE; K NAKAGAWA; Y AWAJI; M OHTSU
OPTICS LETTERS, 20, 6, 572-574, Mar. 1995, Peer-reviwed
Scientific journal, English

HIGHLY PRECISE 1-THZ OPTICAL FREQUENCY-DIFFERENCE MEASUREMENT OF 1.5-MU-M MOLECULAR ABSORPTION-LINES
K NAKAGAWA; M DELABACHELERIE; Y AWAJI; M KOUROGI; T ENAMI; M OHTSU
OPTICS LETTERS, 20, 4, 410-412, Feb. 1995
Scientific journal, English

ABSOLUTE FREQUENCY STABILITY OF A DIODE-LASER-PUMPED ND-YAG LASER STABILIZED TO A HIGH-FINESSE OPTICAL CAVITY
K NAKAGAWA; AS SHELKOVNIKOV; T KATSUDA; M OHTSU
APPLIED OPTICS, 33, 27, 6383-6386, Sep. 1994, Peer-reviwed
Scientific journal, English

FAST FREQUENCY STABILIZATION OF A DIODE-LASER-PUMPED MONOLITHIC ND-YAG LASER WITH AN EXTRA-CAVITY ELECTROOPTIC MODULATOR
K NAKAGAWA; AS SHELKOVNIKOV; T KATSUDA; M OHTSU
OPTICS COMMUNICATIONS, 109, 5-6, 446-450, Jul. 1994, Peer-reviwed
Scientific journal, English

FREQUENCY CHAIN TOWARDS THE CA INTERCOMBINATION LINE BASED ON LASER-DIODES - 1ST STEP
AM AKULSHIN; K NAKAGAWA; M OHTSU
APPLIED PHYSICS B-LASERS AND OPTICS, 58, 6, 529-532, Jun. 1994, Peer-reviwed
Scientific journal, English

ULTRANARROW (C2H2)-C-13 SATURATED-ABSORPTION LINES AT 1.5 MU-M
M DELABACHELERIE; K NAKAGAWA; M OHTSU
OPTICS LETTERS, 19, 11, 840-842, Jun. 1994, Peer-reviwed
Scientific journal, English

HIGHLY SENSITIVE DETECTION OF MOLECULAR ABSORPTION USING A HIGH FINESSE OPTICAL CAVITY
K NAKAGAWA; T KATSUDA; AS SHELKOVNIKOV; M DELABACHELERIE; M OHTSU
OPTICS COMMUNICATIONS, 107, 5-6, 369-372, May 1994, Peer-reviwed
Scientific journal, English

HIGH-POWER DIODE-LASER-PUMPED TWISTED-MODE ND-YAG LASER
K NAKAGAWA; Y SHIMIZU; M OHTSU
IEEE PHOTONICS TECHNOLOGY LETTERS, 6, 4, 499-501, Apr. 1994, Peer-reviwed
Scientific journal, English

DEVELOPMENT OF ALL-SEMICONDUCTOR LASER SOURCES FOR STUDIES OF SR-88(+) IONS CONFINED IN RF TRAP
M MUSHA; A ZVYAGIN; K NAKAGAWA; M OHTSU
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 33, 3B, 1603-1607, Mar. 1994, Peer-reviwed
Scientific journal, English

REFLECTION-RESONANCE-TYPE PHOTON SCANNING TUNNELING MICROSCOPE
SD JIANG; K NAKAGAWA; M OHTSU
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS, 33, 1A, L55-L58, Jan. 1994, Peer-reviwed
Scientific journal, English

PROPOSAL OF A FREQUENCY-SYNTHESIS CHAIN BETWEEN THE MICROWAVE AND OPTICAL FREQUENCIES OF THE CA INTERCOMBINATION LINE AT 657-NM USING DIODE-LASERS
K NAKAGAWA; M KOUROGI; M OHTSU
APPLIED PHYSICS B-PHOTOPHYSICS AND LASER CHEMISTRY, 57, 6, 425-430, Dec. 1993, Peer-reviwed
Scientific journal, English

WIDE-SPAN OPTICAL FREQUENCY COMB GENERATOR FOR ACCURATE OPTICAL FREQUENCY DIFFERENCE MEASUREMENT
M KOUROGI; K NAKAGAWA; M OHTSU
IEEE JOURNAL OF QUANTUM ELECTRONICS, 29, 10, 2693-2701, Oct. 1993, Peer-reviwed
Scientific journal, English

SUB-MHZ DOPPLER-FREE SPECTRAL-LINE OF 5(1)S(0)-5(3)P(1) INTERCOMBINATION TRANSITION IN STRONTIUM
A AKULSHIN; A CELICOV; M OHTSU; K NAKAGAWA; VELICHANSKY, V
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS, 32, 9B, L1356-L1358, Sep. 1993, Peer-reviwed
Scientific journal, English

FREQUENCY CONTROL OF SEMICONDUCTOR-LASERS
M OHTSU; K NAKAGAWA; M KOUROGI; W WANG
JOURNAL OF APPLIED PHYSICS, 73, 12, R1-R17, Jun. 1993, Peer-reviwed
Scientific journal, English

COHERENT ADDITION OF INJECTION-LOCKED HIGH-POWER ALGAAS DIODE-LASERS
W WANG; K NAKAGAWA; S SAYAMA; M OHTSU
OPTICS LETTERS, 17, 22, 1593-1595, Nov. 1992, Peer-reviwed
Scientific journal, English

1.5 MU-M DIODE LASER-BASED NONLINEAR FREQUENCY CONVERSIONS BY USING POTASSIUM TITANYL PHOSPHATE
WZ WANG; K NAKAGAWA; Y TODA; M OHTSU
APPLIED PHYSICS LETTERS, 61, 16, 1886-1888, Oct. 1992, Peer-reviwed
Scientific journal, English

FREQUENCY NOISE-REDUCTION OF A DIODE-LASER BY USING THE FM SIDE-BAND TECHNIQUE
K NAKAGAWA; M KOUROGI; M OHTSU
OPTICS LETTERS, 17, 13, 934-936, Jul. 1992, Peer-reviwed
Scientific journal, English

DIRECT MODULATION OF BLUE RADIATION FROM FREQUENCY-DOUBLED ALGAAS LASER DIODE USING THE ELECTROOPTIC EFFECT IN A KNBO3 NONLINEAR CRYSTAL
T SENOH; Y FUJINO; Y TANABE; M HIRANO; M OHTSU; K NAKAGAWA
APPLIED PHYSICS LETTERS, 60, 10, 1172-1174, Mar. 1992, Peer-reviwed
Scientific journal, English

OBSERVATION AND ANALYSIS OF THE DELTA-UPSILON=5 STRETCH OVERTONE BAND TRANSITION OF (NH3)-N-15
Y MORIWAKI; K NAKAGAWA; T SHIMIZU
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 30, 11A, 2901-2907, Nov. 1991, Peer-reviwed
Scientific journal, English

INJECTION LOCKING OF A HIGHLY COHERENT AND HIGH-POWER DIODE-LASER AT 1.5 MU-M
K NAKAGAWA; M TESHIMA; M OHTSU
OPTICS LETTERS, 16, 20, 1590-1592, Oct. 1991, Peer-reviwed
Scientific journal, English

半導体レーザーの周波数制御とその応用
大津元一; 中川賢一
応用物理, 応用物理学会, 58, 10, 1428-1444, Oct. 1989, Peer-reviwed
Scientific journal, Japanese

OBSERVATION OF THE STARK-EFFECT IN HIGH-OVERTONE BAND TRANSITIONS OF NH3
K NAKAGAWA; Y MORIWAKI; T SHIMIZU
OPTICS LETTERS, 14, 10, 488-490, May 1989, Peer-reviwed
Scientific journal, English

HIGHLY SENSITIVE SPECTROMETER WITH 0.78 MU-M ALGAAS DIODE-LASERS
K NAKAGAWA; T SHIMIZU
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS, 26, 10, L1697-L1700, Oct. 1987, Peer-reviwed
Scientific journal, English

COLLISIONAL RELAXATION AMONG ROTATION-INVERSION LEVELS IN THE HIGHLY EXCITED VIBRATIONAL-STATE OF NH3
Y MATSUO; K NAKAGAWA; T KUGA; T SHIMIZU
JOURNAL OF CHEMICAL PHYSICS, 86, 4, 1878-1882, Feb. 1987, Peer-reviwed
Scientific journal, English

量子慣性センサーの実用化にむけた最近の研究開発動向
中川賢一
Lead, Feb. 2024, OPTRONICS, 43, 506, 96-99, Japanese, Invited, Introduction commerce magazine

リュードベリ原子を用いた量子シミュレーション
中川賢一; 田村光
丸善, 01 May 2018, パリティ, 33, 5, 37-39, Japanese, Peer-reviwed, Invited, Introduction commerce magazine

22pBK-9 Development and frequency control of a mode-locked fiber laser with low repetition frequency
Sugata T; Yamada Y; Okubo S; Kobayashi T; Inaba H; Onae A; Nakagawa K; Yoshii K; Hong F.-L
The Physical Society of Japan, 2016, Meeting Abstracts of the Physical Society of Japan, 71, 0, 834-834, Japanese, 2189-079X, 110010056860, AA12721570

22pBK-8 光周波数分周と位相同期高調波光の生成
大饗 千彰; Suhaimi Nurul Sheeda; Gavara Trivikramarao; 中川 賢一; 洪 鋒雷; 桂川 眞幸
一般社団法人 日本物理学会, 2016, 日本物理学会講演概要集, 71, 0, Japanese, 110010056859

光共振器と結びつく物質波計測
中川賢一
丸善, 01 Jan. 2016, パリティ, 31, 1, 74-75, Japanese, Introduction commerce magazine, 0911-4815, 40020685718, AN10017131

ド・ブロイのものさし
中川賢一
丸善出版, 01 Mar. 2015, パリティ, 30, 3, 14-23, Japanese, Invited, Others, 0911-4815, 40020370561, AN10017131

10aAW-3 Highly sensitive molecular spectroscopy using dual-comb spectrometer
Watanabe Naoto; Musha Mitsuru; Nakagawa Ken'ichi
The Physical Society of Japan (JPS), 22 Aug. 2014, Meeting abstracts of the Physical Society of Japan, 69, 2, 101-101, Japanese, 1342-8349, 110009875536, AA11439205

29pCF-5 Control of the number of atoms using light-assisted collisions in an optical microtrap
Tamura Hikaru; He Jun; Unakami Tomoyuki; Nakagawa Kenichi
The Physical Society of Japan (JPS), 05 Mar. 2014, Meeting abstracts of the Physical Society of Japan, 69, 1, 206-206, Japanese, 1342-8349, 110009834281, AA11439205

Dual-comb spectroscopy using two electro-optic modulator based frequency combs II
Watanabe Naoto; Kitamura Toshiyuki; Terui Rika; Musha Mitsuru; Nakagawa Ken'ichi
The Physical Society of Japan (JPS), 26 Aug. 2013, Meeting abstracts of the Physical Society of Japan, 68, 2, 168-168, Japanese, 1342-8349, 110009754744, AA11439205

27pEE-9 Dual-comb spectroscopy using two electro-optic modulator based frequency combs
Watanabe Naoto; Kitamura Toshiyuki; Musha Mitsuru; Nakagawa Ken'ichi
The Physical Society of Japan (JPS), 26 Mar. 2013, Meeting abstracts of the Physical Society of Japan, 68, 1, 221-221, Japanese, 1342-8349, 110009643209, AA11439205

21pAL-2 High-precision gravimeter based on atom interferometry using cooled Rb atom
Onoda Keigo; Watanabe Naoto; Hori Norimasa; Nakagawa Ken'ichi
The Physical Society of Japan (JPS), 24 Aug. 2012, Meeting abstracts of the Physical Society of Japan, 67, 2, 179-179, Japanese, 1342-8349, 110009601944, AA11439205

レーザー励起リドベルグ原子を用いた量子もつれ状態の生成とその量子情報への応用
Ken'ichi NAKAGAWA
Dec. 2011, レーザー研究, 39, 12, 904-909, Japanese, Peer-reviwed, Introduction other

ボース凝縮原子を用いた素因数分解
中川賢一
Aug. 2009, パリティ, 24, 9, 28-30, Japanese, Introduction other

20pZA-3 Absolute frequency measurement of a Sr optical lattice clock using coherent optical carrier transfer over a 120-km fiber
Hong F.-L.; Musha M.; Takamoto M.; Inaba H.; Yanagimachi S.; Takamizawa A.; Watabe K.; Ikegami T.; Imae M.; Fujii Y.; Amemiya M.; Nakagawa K.; Ueda K.; Katori H.
The Physical Society of Japan (JPS), 25 Aug. 2008, Meeting abstracts of the Physical Society of Japan, 63, 2, 101-101, Japanese, 1342-8349, 110006982761, AA11439205

アトムチップ－基板上で冷却原子を操作する
中川賢一; 堀越宗一
Jul. 2008, 光学, 37, 7, 391-396, Japanese, Peer-reviwed, Introduction other

23aQD-8 The spectroscopy of Ryberg states of ^<87>Rb atom using a two-photon transition II
Fukusen Miho; Tamaki Yoshihito; Katsuragawa Masayuki; Hong Feng-Lei; Nakagawa Ken'ichi
The Physical Society of Japan (JPS), 2008, Meeting Abstracts of the Physical Society of Japan, 63, 0, Japanese, 1342-8349, 110007196860

20aWA-14 Precision gravity measurements using atom interferometry III
Oda Yusuke; Goto Akihiko; Nakagawa Kenichi
The Physical Society of Japan (JPS), 19 Aug. 2005, Meeting abstracts of the Physical Society of Japan, 60, 2, 61-61, Japanese, 1342-8349, 110004537697, AA11439205

24aYE-4 Precision gravity measurements using atom interferometry II
Koda Yusuke; Goto Akihiko; Horikoshi Munekazu; Nakagawa Ken'ichi
The Physical Society of Japan (JPS), 04 Mar. 2005, Meeting abstracts of the Physical Society of Japan, 60, 1, 135-135, Japanese, 1342-8349, 110004534678, AA11439205

13aTF-2 Gravitational acceleration measurements using an atomic interferometer
Nakagawa Kenichi; Horikoshi Munekazu; Koda Yusuke; Nakayabu Takeshi; Kim Jung Bog
The Physical Society of Japan (JPS), 25 Aug. 2004, Meeting abstracts of the Physical Society of Japan, 59, 2, 102-102, Japanese, 1342-8349, 110002051002, AA11439205

Precision Measurements and Quantum Information Processing with an Atom Interferometry
Ken'ichi Nakagawa
Jul. 2004, レーザー研究, 32, 457-462, Japanese, Peer-reviwed, Introduction other

高精度周波数標準の応用
中川賢一
日本工業出版, Sep. 2003, 光アライアンス, 14, 9, 64-67, Japanese, Introduction other, 0917-026X, 80016096355, AA11758790

Developments and Applications of the Acetylene Stabilized Laser at the 1542nm
SATO Y.; MUSHA M.; NAKAGAWA K.; UEDA K.
20 Jan. 2003, レーザー学会研究会報告 = Reports on the Topical meeting of the Laser Society of Japan, 308, 19-22, Japanese, 10010260685, AA11604414

原子のB-E凝縮最前線
中川賢一
丸善, Aug. 2000, パリティ, 15, 8, 4-12, Japanese, Introduction other, 0911-4815, 40004595670, AN10017131

光周波数計測と通信網への応用
大苗 敦; 池上 健; 中川賢一; 古賀正文; 手島光啓
電気学会, Jul. 1999, 電気学会論文誌C, 119, 7, 765-770, Japanese, Peer-reviwed, Introduction other, 0385-4221, 10004438195, AN10065950

1998年光学界の進展６．量子光学・非線型光学
中川賢一
1999, 光学, 28, 4, 176-177, Japanese, Introduction other

半導体レーザによるRb原子のレーザ冷却トラップ
福田京也; 上妻幹男; 中川賢一; 大津元一
Sep. 1994, 電気学会東京支部連合研究会（電子回路研究会）講演論文集ECT-94, Japanese, Summary national conference

超高安定レーザーの実現に向けて
中川賢一; 大津元一
Apr. 1991, 天文月報, 84, 4, 125-126, Japanese, Introduction other

超高コヒーレントレーザー
中川賢一
応用物理学会分科会日本光学会, Oct. 1990, 光学, 19, 10, 642-649, Japanese, Peer-reviwed, Introduction other, 0389-6625, 40001174680, AN00080324

量子センシングハンドブック
監修 根来
Others, Japanese, Contributor, 第3章第2節次世代高性能量子慣性センサ, （株）エヌ・ティー・エス, 28 Mar. 2021

ペンギン物理学辞典
清水忠雄; 清水文子
Dictionary or encycropedia, Japanese, 朝倉書店, 2012

光科学研究の最前線2
霜田光一
Japanese, Joint work, I-3-5 周波数安定化レーザー, 強光子場科学研究懇談会, Dec. 2009

RGB3原色・白色光レーザーの開発
阿山みよし; 植田憲一; 岡田龍雄; 藤井寛一; Xiaopen Hu; Shining Zhu; 泉 和弘; 北谷雅人; 花村榮一; 宅間宏; 原田明憲; 西澤典彦; 白川晃; 小林孝嘉; 西岡一; 中川賢一; 美濃島薫; 春名正光; 小林洋平; 藤田雅之; 岸野克巳; 水内公典; 天野浩; 興雄司; 佐久間純; 須田清志
Japanese, Joint work, 第４章 第1節 光周波数コムと光周波数標準, サイエンス＆テクノロジー, Jul. 2007

光科学研究の最前線
赤崎 勇
Japanese, Joint work, Ｉ3-4 周波数安定化レーザー, 強光子場科学研究懇談会, Sep. 2005

レーザーハンドブック(第2版)
Japanese, Joint work, オーム社, 2005

超精密計測がひらく世界 高精度計測が生み出す新しい物理 計量研究所編 (共著)
Japanese, Joint work, 講談社, May 1998

ロングマン物理学辞典
清水忠雄; 清水文子
Dictionary or encycropedia, Japanese, 朝倉書店, 1998

応用物理用語大事典
Japanese, Joint work, オーム社, 1998

Solid-State Lasers
中川賢一
Japanese, Joint work, 学会出版センター, 1997

極限光技術
荒川泰彦; 上原喜代治; 大津元一; 香川俊明; 加藤義章; 神谷武志; 菊池昭彦; 菊池和朗; 岸野克巳; 黒須隆行; 榊裕之; 作間英一; 佐藤卓蔵; 清水明; 高木芳弘; 宅間宏; 立川真樹; 田中充; 張吉夫; 土屋昌弘; 土屋裕; 中川賢一; 中塚正大; 長沼和則; 平野琢也; 藤原裕文; 本多徳行; 松末俊夫; 三尾典克; 水戸郁夫; 森村正直; 矢部孝; 山口昌幸; 渡部俊太郎
Japanese, Joint work, 超広帯域光周波数シンセサイザー, オプトロニクス社, 1993

COHERENCE, AMPLIFICATION, AND QUANTUM EFFECTS IN SEMICONDUCTOR LASERS
Y. Yamamoto; O. Nilsson; A. Karlsson; E. Berglind; Y. Yoshikuni; M. Ohtsu; K. Nakagawa; T. G. Hodgkinson; T. Saitoh; T. Mukai; R. M. Jopson; T. E. Darcie; S. Kobayashi; P. L. Liu; S. Machida; M. C. Teich; B. E. A. Saleh; F. Capasso; K. Igeta; G. Bjork
English, Joint work, Chapter 5 Spectroscopy by Semiconductor Lasers, John Wiley and Sons Inc., 1991

マイクロトラップ中の冷却Rb原子を用いたリュードベリ・ブロッケードの観測
石橋裕生; 飯倉佑樹; 白澤慶; 田崎翔; 中川賢一
Oral presentation, Japanese, 日本物理学会2025年春季大会
20 Mar. 2025
18 Mar. 2025- 21 Mar. 2025

可搬型原子重力計の開発とそのフィールド重力測定への応用
中川 賢一; 下村高輝; 高木耕介; 高見沢史佳; 西岡直紀
Poster presentation, Japanese, 光・量子飛躍フラッグシッププログラム第7回シンポジウム
28 Feb. 2025
28 Feb. 2025- 28 Feb. 2025

Development of an analog quantum simulator with laser-cooled Rydberg atoms II
H. Ishibashi; Y. Iikura; K.Shirasawa; K. Nakagawa
Oral presentation, Japanese, 日本物理学会第79回年次大会(2024年)
18 Sep. 2024
16 Sep. 2024- 19 Sep. 2024

Development of an analog quantum simulator with laser-cooled Rydberg atoms I
Y. Ikura; H. Ishibashi; K. Shirasawa; K. Nakagawa
Oral presentation, Japanese, 日本物理学会第79回年次大会(2024年)
18 Sep. 2024
16 Sep. 2024- 19 Sep. 2024

Development of a transportable cold atom gravimeter and its applications
Ken’ichi Nakagawa
Invited oral presentation, Japanese, 電気学会電子回路研究会「超精密計測技術の研究開発」, Invited
13 Sep. 2024
13 Sep. 2024- 13 Sep. 2024

可搬型原子重力計の開発とその応用
中川賢一
Invited oral presentation, Japanese, 第6回 冷却原子研究会「アトムの会」, Invited
31 Jul. 2024
30 Jul. 2024- 01 Aug. 2024

光双極子トラップ中の冷却Rb原子のリュードベリ状態の分光
石橋 裕生; 飯倉 佑樹; 白澤 慶; 中川 賢一
Oral presentation, Japanese, 日本物理学会2024年春季大会
20 Mar. 2024
18 Mar. 2024- 21 Mar. 2024

可搬型原子重力計による実験室外での重力測定実験
高村 海渡; 下村 高輝; 中川 賢一
Oral presentation, Japanese, 日本物理学会2024年春季大会
20 Mar. 2024
18 Mar. 2024- 21 Mar. 2024

Development of a hybrid atomic gravimeter for field gravity measurements
Kaito Takamura; Takeshi Hojo; Ken'ichi Nakagawa
Poster presentation, English, Quantum Innovation 2023/ Q-LEAP 6th IFQMS
16 Nov. 2023
15 Nov. 2023- 17 Nov. 2023

リュードベリ原子の量子シミュレーション用二光子励起レーザーシステムの開発
石橋裕生; 飯倉佑樹; 中川賢一
Oral presentation, Japanese, 日本物理学会第78回年会(2023年)
18 Sep. 2023
16 Sep. 2023- 19 Sep. 2023

ハイブリット方式による原子干渉計型重力計の開発
高村海渡; 中川賢一
Oral presentation, Japanese, 日本物理学会第78回年会(2023年)
18 Sep. 2023
16 Sep. 2023- 19 Sep. 2023

Rb原子のRydberg状態二光子励起用レーザーの周波数安定化
石橋裕生; 飯倉佑樹; 中川賢一
Oral presentation, Japanese, 日本物理学会 2023年春季大会
24 Mar. 2023

ハイブリット方式による可搬型重力加速度計の高感度化
北条孟; 高村海斗; 中川賢一
Oral presentation, Japanese, 日本物理学会2023年春季大会
24 Mar. 2023

電磁誘起透明化によるRb 原子の5S-6P-nD 二光子吸収遷移の 観測
石橋裕生; 飯倉佑樹; 中川賢一
Oral presentation, Japanese, 日本物理学会2022年秋季大会, 日本物理学会, 東京工業大学, Domestic conference
15 Sep. 2022

原子干渉型重力加速度計の感度向上に向けた防振システムの開発
北条孟; 高村海渡; 中川賢一
Oral presentation, Japanese, 日本物理学会2022年秋季大会, 日本物理学会, 東京工業大学, Domestic conference
14 Sep. 2022

原子干渉を用いた可搬型重力加速度計の開発(1)レーザー光源の開発
北条孟; 山崎智樹; 高村海渡; 岩國加奈; 中川賢一
Oral presentation, Japanese, 日本物理学会第77回年次大会, Domestic conference
16 Mar. 2022

原子干渉計を用いた可搬型重力加速度計の開発(2) 重力加速度測定
山崎智樹; 北条孟; 高村海渡; 中川賢一
Oral presentation, Japanese, 日本物理学会第77回年次大会, Domestic conference
16 Mar. 2022

空間光変調器を用いた無欠損な原子アレイの作成方法の開発
吉田佑策; 石橋裕生; 中川賢一
Oral presentation, Japanese, 日本物理学会第77回年次大会, Domestic conference
16 Mar. 2022

Development of transportable atomic gravimeters for field applications
Ken'ichi Nakagawa
Invited oral presentation, English, QUANTUM INNOVATION 2021, 4th International Forum on Quantum Metrology and Sensing, Invited, International conference
09 Dec. 2021

原子重力加速度計のためのレーザーシステムの開発
石川悠; 羽石暁; 山崎智樹; 北条孟; 中川賢一
Oral presentation, Japanese, 日本物理学会第76回年次大会, 日本物理学会, Domestic conference
14 Mar. 2021

原子干渉計を用いた可搬型重力加速度計に向けた小型センサーヘッドの開発
羽石暁; 石川悠; 山崎智樹; 北条孟; 中川賢一
Oral presentation, Japanese, 日本物理学会第76回年次大会, Domestic conference
14 Mar. 2021

トランスファー共振器を用いたRb原子のRydberg状態励起用レーザーの開発
奥野央志; 吉田佑策; 石橋裕生; 中川賢一
Oral presentation, Japanese, 日本物理学会第76回年次大会, Domestic conference
14 Mar. 2021

Rb原子のRydberg状態励起用波長420 nm干渉フィルタ安定型半導体レーザーの開発3
高瀬直美; 奥野央志; 中川賢一
Oral presentation, Japanese, 日本物理学会第75回年次大会, Domestic conference
19 Mar. 2020

可搬型原子重力加速度計の開発Ⅰ
石川悠; 羽石暁; 山崎智樹; 吉田佑策; 中川賢一
Oral presentation, Japanese, 日本物理学会第75回年次大会, Domestic conference
16 Mar. 2020

可搬型原子重力加速度計の開発Ⅱ
羽石暁; 石川悠; 山崎智樹; 吉田佑策; 中川賢一
Oral presentation, Japanese, 日本物理学会第75回年次大会, Domestic conference
16 Mar. 2020

Development of a Transportable Atomic Gravimeter for the Field Applications
K. Nakagawa; H. Ishikawa; S. Haneishi; T. Kishimoto
Poster presentation, English, The 2nd International Forum on QuantumMetrologyand Sensing, 文科省, 京都 ブライトンホテル, International conference
18 Dec. 2019

Rb原子のRydberg状態励起用波長420nm干渉フィルタ安定型半導体レーザーの開発II
高瀬直美; 奥野央志; 中川賢一
Oral presentation, Japanese, 日本物理学会2019年秋季大会, Domestic conference
10 Sep. 2019

Rb原子のRydberg状態励起用波長420nm干渉フィルタ安定型半導体レーザーの開発
高瀬直美; 奥野央志; 中川賢一
Oral presentation, Japanese, 日本物理学会2019年秋季大会, Domestic conference
10 Sep. 2019

Rb原子のRydberg状態励起用波長420nm干渉フィルター安定型半導体レーザーの開発
高瀬直美; 岸本哲夫; 中川賢一
Oral presentation, Japanese, 日本物理学会第74回年次大会, 日本物理学会, 九州大学伊都キャンパス, Domestic conference
17 Mar. 2019

Cutting edge of Quantum simulations with Rydberg atoms
中川 賢一
Invited oral presentation, Japanese, 日本物理学会 第74回年次大会 シンポジウム「量子シミュレーションの最前線」, Invited, 日本物理学会, 九州大学伊都キャンパス, Domestic conference
14 Mar. 2019

Quantum simulation of many-body systems with cold Rydberg atoms
Ken’ichi Nakagawa; Hikaru Tamura; Tomotake Yamakoshi
Invited oral presentation, English, 2nd Asia-Pacific Workshop on Trapped Quantum System, Invited, KAIST, Daejeon, South Korea, International conference
22 Feb. 2019

Programmable quantum simulators based on cold Rydberg atoms
Ken'ichi Nakagawa; Hikaru Tamura; Tomotake Yamakoshi
Invited oral presentation, English, the 13 th Japan-US Joint Seminar on Quantum Electronics and Laser Spectroscopy, Invited, 東京大学、コロラド大学JILA研究所, 金沢市, International conference
25 Sep. 2018

冷却リュードベリ原子を用いた量子多体系シミュレータ
中川賢一
Invited oral presentation, Japanese, 物性研究所 短期研究会「量子情報・物性の新潮流」, Invited, 東大物性研, 東大柏キャンパス, Domestic conference
01 Aug. 2018

Quantum simulation of many-body systems with cold Rydberg atoms
Ken’ichi Nakagawa; Hikaru Tamura; Tomotake Yamakoshi
Invited oral presentation, English, The 8th International Symposium on Cold Atom Physics, Invited, Wuhan Institute of Physics and Mathematics,CAS, Wuhan, China, International conference
11 Jun. 2018

Towards quantum simulations of many-body systems using 2D arrays of cold Rydberg atoms
Hikaru Tamura; Tomotake Yamakoshi; Ken’ichi Nakagawa
Invited oral presentation, English, The EMN(Energy Material and Nanotechnology) meeting on Quantum Technology 2018, Invited, Dubrovnik, Croatia, International conference
07 May 2018

冷却リュードベリ原子を用いたプログラマブル多体系量子シミュレータ
中川賢一; 田村光; 山越智健
Oral presentation, Japanese, 日本物理学会第73回年次大会, 東京理科大学 野田キャンパス, Domestic conference
25 Mar. 2018

Quantum simulator with cold Rydberg atoms in micro trap arrays
Ken'ichi Nakagawa
Invited oral presentation, English, 1st-Asia-Pacific Workshop on Trapped Quantum Systems, Invited, School of Physics and Astronomy, Sun Yat-sen University, Zhuhai, China, International conference
09 Dec. 2017

光周波数コムを用いたアセチレン分子の二重共鳴分光
渡邉直登; 武者満; 中川賢一
Oral presentation, Japanese, 日本物理学会2017年秋季大会, 日本物理学会, 岩手大学, Domestic conference
23 Sep. 2017

リドベルグ原子を用いたスピン系量子シミュレーション
田村光; 山越智健; 中川賢一
Oral presentation, Japanese, 日本物理学会2017年秋季大会, 日本物理学会, 岩手大学, Domestic conference
22 Sep. 2017

Towards quantum simulation of Ising spins using cold Rydberg atoms in microtrap arrays
H. Tamura; T. Yamakoshi; K. Nakagawa
Oral presentation, English, The 24th Congress of the International Commision for Optics, InternationalCommision for Optics, 京王プラザホテル(新宿), International conference
24 Aug. 2017

Observation of spatially ordered Rydberg excitation in an one-dimensional optical microtrap array
Hikaru Tamura; Tomotake Yamakoshi; Ken’ichi Nakagawa
Poster presentation, English, International Conference on Laser Spectroscopy(ICOLS) 2017, ICOLS organizing commitee, Arcachon, France, International conference
03 Jul. 2017

単一リドベルグ原子アレーを用いたスピン系量子シミュレー ション
田村 光; 山越 智健; 中川 賢一
Poster presentation, Japanese, 第14回原子・分子・光科学(AMO)討論会, 原子・分子・光科学(AMO)討論会実行委員会, 電気通信大学, Domestic conference
30 Jun. 2017

格子ポテンシャル中のRydberg原子を用いたスピン輸送
山越智健; 中川賢一
Oral presentation, Japanese, 日本物理学会第72回年次大会, 日本物理学会, 大阪大学 豊中キャンパス, Domestic conference
18 Mar. 2017

単一原子アレー中のリドベルグブロッケード観測III
田村光; 山口祐介; 中川賢一
Oral presentation, Japanese, 日本物理学会第72回年次大会, 日本物理学会, 大阪大学豊中キャンパス, Domestic conference
18 Mar. 2017

Quantum simulators using cold Rydberg atoms in holographic microtrap arrays
Ken'ichi Nakagawa; Hikaru Tamura; Tomotake Yamakoshi
Oral presentation, English, 9th International Workshops on Fundamental Physics Using Atoms (FAUA), 京都大学, 京都大学桂キャンパス, International conference
10 Jan. 2017

冷却原子を用いた原子干渉計(AI)慣性センサーの最近の動向
中川賢一
Invited oral presentation, Japanese, 文部科学省量子科学技術委員会(第6回), Invited, 文部科学省, 文部科学省庁舎, Domestic conference
07 Oct. 2016

光周波数コムを用いたカルシウムイオン分光用基準光配信システムの開発
中信長; 渡邉直登; 土師慎裕; 向山敬; 中川賢一
Oral presentation, Japanese, 日本物理学会2016年秋季大会, 日本物理学会, 金沢大学, Domestic conference
16 Sep. 2016

光周波数コムを用いた87Rb原子リドベルグ状態の絶対周波数測定
渡邉直登; 中信長; 田村光; 武者満; 中川賢一
Oral presentation, Japanese, 日本物理学会2016年秋季大会, 日本物理学会, 金沢大学, Domestic conference
16 Sep. 2016

光誘起衝突を用いた光マイクロトラップ中への単一原子ローディングの高効率化
山口祐介; 田村光; 中川賢一
Oral presentation, Japanese, 日本物理学会2016年秋季大会, 日本物理学会, 金沢大学, Domestic conference
15 Sep. 2016

単一原子アレー中のリドベルグブロッケード観測II
田村光; 山口祐介; 海上智行; 竹村直貴; 中川賢一
Oral presentation, Japanese, 日本物理学会2016年秋季大会, 日本物理学会, 金沢大学, Domestic conference
15 Sep. 2016

Precision Spectroscopy of 87Rb Rydberg states using an optical frequency synthesizer based on an optical frequency comb
Naoto Watanabe; Hikaru Tamura; Nobunaga Naka; Mitsuru Musha; Ken'ichi Nakagawa
Poster presentation, English, The 25th International Conference on Atomic Physics, Seoul, Korea, International conference
25 Jul. 2016

Realization of highly uniform microtrap arrays for quantum simulation of many-body systems using Rydberg atoms
Hikaru Tamura; Yusuke Yamaguchi; Ken'ichi Nakagawa
Poster presentation, English, The 25th International Conference on Atomic Physics, Seoul, Korea, International conference
25 Jul. 2016

High fidelity detection of single atoms trapped in holographic microtrap arrays
Hikaru Tamura; Tomoyuki Unakami; Jun He; Yoko Miyamoto; Ken'ichi Nakagawa
Poster presentation, English, The 3rd OPTICAL MANIPULATION CONFERENCE ( OMC '16 ), Pacifico Yokohama, Kanagawa Prefecture, Japan, Domestic conference
18 May 2016

トランスファー共振器を用いたリドベルグ励起光源の周波数安定化
海上智行; 田村光; 竹村直貴; 中川賢一
Oral presentation, Japanese, 日本物理学会第71回年次大会, Domestic conference
22 Mar. 2016

FPGAを用いたデジタルレーザー周波数制御システムの開発
山本真稔; 竹村直貴; 海上智行; 中川賢一
Oral presentation, Japanese, 日本物理学会第71回年次大会, Domestic conference
22 Mar. 2016

単一原子アレー中のリドベルグブロッケード観測
田村光; 海上智行; 竹村直貴; 中川賢一
Oral presentation, Japanese, 日本物理学会第71回年次大会, Domestic conference
22 Mar. 2016

光周波数コムを用いた87Rb原子のリドベルグ励起用基準光源の開発II
渡邉直登; 中 信長; 竹村直貴; 海上智行; 田村光; 武者満; 中川賢一
Oral presentation, Japanese, 第63回応用物理学会春季学術講演会, Domestic conference
21 Mar. 2016

Towards quantum simulations of many-body systems with cold Rydberg atoms
Ken'ichi Nakagawa
Invited oral presentation, English, OIST Mini Symposium "Rydberg atoms for Quantum technologies", Invited, OIST, 沖縄 沖縄科学技術大学院大学, International conference
05 Mar. 2016

Observing and controlling the quantum world with ultracold atoms
Ken'ichi Nakagawa
Invited oral presentation, English, The Irago Conference 2015, Invited, 豊橋科学技術大学、電気通信大学, 愛知県田原市伊良湖, International conference
22 Oct. 2015

Manipulation of ultra cold atoms for quantum technologies: from atomic interferometers to quantum simulators
Ken'ichi Nakagawa
Invited oral presentation, English, 12th US-Japan Seminar Many body quantum systems from quantum gases to metrology and information processing, Invited, Madison, Wisconsin, USA, International conference
24 Sep. 2015

87Rb原子のリドベルグ状態励起用480nm高出力周波数安定化レーザーの開発
竹村直貴; 田村光; 金井大輔; 中川賢一
Oral presentation, Japanese, 日本物理学会2015年秋季大会, Domestic conference
18 Sep. 2015

冷却リドベルグ87Rb原子集団を用いた非線形量子光学効果
千葉学; 竹村直貴; 田村光; 中川賢一
Oral presentation, Japanese, 日本物理学会2015年秋季大会, 日本物理学会, 関西大学, Domestic conference
18 Sep. 2015

光マイクロトラップアレーへの単一原子ローディング
田村光; 海上智行; 竹村直貴; 中川賢一
Oral presentation, Japanese, 日本物理学会2015年秋季大会, 日本物理学会, 関西大学, Domestic conference
18 Sep. 2015

空間光位相変調器を用いた光マイクロトラップアレーの実現
海上智行; 田村光; 宮本洋子; 中川賢一
Oral presentation, Japanese, 日本物理学会第70回年次大会, 日本物理学会, 早稲田大学
23 Mar. 2015

光誘起衝突を用いた光マイクロトラップ中の原子数制御
田村光; 海上智行; 中川賢一
Oral presentation, Japanese, 日本物理学会第70回年次大会, 日本物理学会, 早稲田大学, Domestic conference
23 Mar. 2015

デュアルコム分光計を用いた高感度分子分光
渡邉直登; 武者満; 中川賢一
Oral presentation, Japanese, 日本物理学会2014年秋季大会, 日本物理学会, 中部大学, Domestic conference
10 Sep. 2014

光マイクロトラップアレーによる単一原子トラップの実現
田村光; Jun He; 海上智行; 宮本洋子; 中川賢一
Oral presentation, Japanese, 日本物理学会2014年秋季大会, 日本物理学会, 中部大学, Domestic conference
09 Sep. 2014

Manipulating ultra cold atoms towards the development of quantum technologies
Ken'ichi Nakagawa
Invited oral presentation, English, The 8th International Conference on Photonics and Applications, Invited, Vietnam Academy of Science and Technology, Da Nang City, Vietnam, International conference
13 Aug. 2014

電気光学変調器型光周波数コムを用いたデュアルコム分光
渡邉直登; 北村俊幸; 武者満; 中川賢一
Oral presentation, Japanese, 日本物理学会,第68回年次大会
Mar. 2013

極高真空生成技術の現状と展望
中川賢一; 無漏田正雄
Public symposium, Japanese, レーザー学会サテライトワークショップ「高強度レーザー場による真空物理の展開-レーザーおよび真空技術への要請-」, レーザー学会, 姫路
Jan. 2013

冷却Rb原子を用いた原子干渉計による高精度重力加速度計
小野田圭吾; 渡邉直登; 堀憲真; 中川賢一
Oral presentation, Japanese, 日本物理学会,2012年秋季大会
Sep. 2012

1μｍレーザーを用いた光双極子トラップ中のRb原子のBECの生成2
鈴木勇輝; Sanjay Kumar; Mark Sadgrove; 中川賢一
Oral presentation, Japanese, 日本物理学会,2012年秋季大会
Sep. 2012

All-Optical Realization of a Bose-einstein Condensation in a 1 μm Dipole trap
Sanjay Kumar; Mark Sadgrove; Yuuki Suzuki; Ken'ichi Nakagawa
Oral presentation, English, 日本物理学会,第67回年次大会(関西学院大)
Mar. 2012

Coherent manipulation and control of light and atoms
Ken'ichi Nakagawa
Public symposium, English, Shanxi University Quantum Optics Workshop, Shanxi University, 太原市（中国山西省）
Mar. 2012

Distribution of interacting atoms in a one-dimensional lattice
Zhanchun Zuo; Daisuke Okuyama; Ken'ichi Nakagawa
Oral presentation, English, 日本物理学会,2011年秋季大会(富山大)
Sep. 2011

位相変調された定在波ポテンシャル中原子の古典エネルギー限界超越
Mark Sadgrove; Sandro Wimberger; Ken'ichi Nakagawa
Oral presentation, English, 日本物理学会,2011年秋季大会(富山大)
Sep. 2011

Large Area Interferometry for Gravimetry
Sanjay Kumar; Mark Sadgrove; Ken'ichi Nakagawa
Oral presentation, English, 日本物理学会,2011年秋季大会(富山大)
Sep. 2011

Rydberg Blockadeを用いた二個の基底状態原子間のエンタングルメントの生成
小林康行; Zhanchun Zuo; 奥山大輔; 中川賢一
Oral presentation, Japanese, 日本物理学会,2011年秋季大会(富山大)
Sep. 2011

Rydbergブロッケードの実現とその量子情報処理への応用
中川賢一
Invited oral presentation, Japanese, 量子エレクトロニクス研究会「冷却原子系で探求する新しい物理と極限技術」, 応用物理学会・量子エレクトロニクス研究会
Dec. 2010

Recent investigation on the coherent manipulation of BEC and single atoms for quantum information processing
Ken'ichi Nakagawa; Mark Sadgrove; Zhanchun Zuo; Tomoki Watanabe; Miho Fukusen; Sanjay Kumar
Invited oral presentation, English, CREST 2010 International Symposium on Physics of Quantum Technology, Japan Science and Technology Agency, Tokyo, International conference
Apr. 2010

Rb原子の全光学的手法によるBEC生成
加地真英; Sanjay Kumar; 関邨哲雄; 中川賢一
Oral presentation, Japanese, 日本物理学会,2009年秋季大会
Sep. 2009

Proof of principle signal processing using matter-wave diffraction
Mark Sadgrove; Sanjay Kumar; Ken'ichi Nakagawa
Oral presentation, Japanese, 日本物理学会,2009年秋季大会
Sep. 2009

Atom Laser Using an All-Optical Bose-Einstein Condensation
Sanjay Kumar; Masahide Kachi; Ken'ichi Nakagawa
Oral presentation, English, 日本物理学会,2009年秋季大会
Sep. 2009

光双極子トラップ中のRb原子のリドベルグ状態へのコヒーレント励起
中川賢一; Zhanchun Zuo; 渡邊智貴; 福泉美穂; 奥山大輔
Oral presentation, 日本物理学会,2009年秋季大会
Sep. 2009

87Rb原子のリュードベルグ準位の周波数測定II
平井秀一。Zhanchun Zuo; 福泉美穂; 渡邊智貴; 中川賢一
Oral presentation, Japanese, 日本物理学会,2009年秋季大会
Sep. 2009

アトムチップによる極低温原子の操作とその応用
中川賢一
Invited oral presentation, Japanese, 日本物理学会第64回年次大会領域1、9、5合同シンポジウム, 日本物理学会
Mar. 2009

Computing exponential sums with a Bose-Einstein condensate
Mark Sadgrove; Sanjay Kumar; Ken'ichi Nakagawa
Invited oral presentation, English, The 39th Winter Colloquium on the Physics of Quantum Electronics (PQE-2009), The 39th Winter Colloquium on the Physics of Quantum Electronics (PQE-2009), Snowbird, Utah, USA, International conference
Jan. 2009

Atom interferometer using a free oscillation of Bose-Einstein-Condensate on an Atom Chip
Ken'ichi Nakagawa; Munekazu Horikoshi
Invited oral presentation, English, The 8th Asian International Seminar on Atomic and Molecular Physics (AISAMP8), The 8th Asian International Seminar on Atomic and Molecular Physics (AISAMP8), Perth, Australia, International conference
Nov. 2008

Factoring with cold atoms
Sanjay Kumar; Mark Sadgrove; Ken'ichi Nakagawa
Oral presentation, Japanese, 日本物理学会,日本物理学会2008年秋季大会
Sep. 2008

Rb原子の2波長光双極子トラップ2
関邨哲雄; 杉江宏太; 加地真英; 渡邊智貴; 中川賢一
Oral presentation, Japanese, 日本物理学会,日本物理学会2008年秋季大会
Sep. 2008

87Rb原子の二光子遷移によるリュードベルグ状態の周波数測定
福泉美穂; Zhanchun Zuo; 渡邊智貴; 中川賢一
Oral presentation, Japanese, 日本物理学会,日本物理学会2008年秋期大会
Sep. 2008

Features in a noise driven quantum-classical transition
Mark Sadgrove; Sanjay Kumar; Ken'ichi Nakagawa
Oral presentation, English, 日本物理学会,日本物理学会2008年秋期大会
Sep. 2008

レーザー冷却Rb原子のトラップロスによるRydberg状態の分光
中川賢一; Zhanchun Zuo; 福泉美穂; 渡邊智貴
Oral presentation, Japanese, 日本物理学会,日本物理学会2008年秋期大会
Sep. 2008

87Rb原子の二光子遷移によるリュードベルグ状態の分光II
福泉美穂; 玉木嘉人; 桂川眞幸; 中川賢一
Oral presentation, Japanese, 日本物理学会,第63回年次大会
Mar. 2008

Phase defects in an optical lattice: effect on coherent atomic dynamics
Mark Sadgrove; Ken'ichi Nakagawa
Oral presentation, English, 日本物理学会,第63回年次大会
Mar. 2008

少数個レーザー冷却Rb原子におけるRydberg励起の双極子ブロッケード
中川賢一; 玉木嘉人; 福泉美穂
Oral presentation, Japanese, 日本物理学会,第63回年次大会
Mar. 2008

87Rb原子の二光子遷移によるリュードベルグ状態の分光
福泉美穂; 玉木嘉人; Mark Sadgrove; 中川賢一
Oral presentation, Japanese, 日本物理学会,第62回年次大会
Sep. 2007

Rb原子の2波長光双極子トラップ
関邨哲雄; 杉江宏太; 中川賢一
Oral presentation, Japanese, 日本物理学会,第62回年次大会
Sep. 2007

Bose-Einstein Condensates in pulsed optical lattices
Mark Sadgrove; Munekazu Horikoshi; Tetsuo Sekimura; Ken'ichi Nakagawa
Oral presentation, English, 日本物理学会,第62回年次大会
Sep. 2007

単一原子トラップを用いた単一光子源
玉木嘉人; Mark Sadgrove; 中川悠輔; 中川賢一
Oral presentation, Japanese, 日本物理学会,日本物理学会2007年春季大会
Mar. 2007

電場を用いたアトムチップによるボーズ凝縮体の操作II
中川賢一; 江村真史; 後藤亮彦
Oral presentation, Japanese, 日本物理学会,日本物理学会2007年春季大会
Mar. 2007

長いコヒーレンス時間を持った調和ポテンシャル中でのBEC干渉計
堀越宗一; 中川賢一
Oral presentation, Japanese, 日本物理学会,日本物理学会2007年春季大会
Mar. 2007

Shift in fundamental quantum resonance for atoms in a pulsed optical lattice
Mark Sadgrove; 堀越宗一; 関邨哲雄; 中川賢一
Oral presentation, English, 日本物理学会,日本物理学会2007年春季大会
Mar. 2007

Atomic interferometer on an atom chip
Ken'ichi Nakagawa; Munekazu Horikoshi
Invited oral presentation, English, International Conference on Lasers and Nanomaterials (ICLAN), Department of Physics, University of Calcutta, Kolkata, India, International conference
Dec. 2006

アトムチップによるボーズ凝縮原子の操作とその応用
中川賢一
Invited oral presentation, Japanese, 原子・分子・光科学(AMO)第3回討論会, 原子・分子・光科学(AMO)討論会実行委員会
Jun. 2006

極低温原子を用いた原子干渉計と精密計測への応用
Ken'ichi Nakagawa
Invited oral presentation, Japanese, 日本物理学会第61回年会 領域1シンポジウム, 日本物理学会
Mar. 2006

フェルミ縮退に向けての40Kと87Rbの同時トラップ
後藤亮彦; 豊永匡利; 中川賢一
Oral presentation, Japanese, 日本物理学会,日本物理学会第61回年会
Mar. 2006

単一87Rb原子の双極子トラップ
中川悠輔; 中川賢一
Oral presentation, Japanese, 日本物理学会,日本物理学会第61回年次大会
Mar. 2006

電場を用いたアトムチップによるボーズ凝縮体の操作
江村真史; 堀越宗一; 中川賢一
Oral presentation, Japanese, 日本物理学会,日本物理学会第61回年次大会
Mar. 2006

磁場ガイドBEC干渉計における位相シフトとコントラスト低下
堀越宗一; 中川賢一
Oral presentation, Japanese, 日本物理学会,日本物理学会第61回年次大会
Mar. 2006

磁場ガイド中のボース凝縮体の操作
堀越宗一; 江村真史; 中川賢一
Oral presentation, Japanese, 日本物理学会,2005年秋季大会
Sep. 2005

磁気光学トラップによる 単一原子トラップⅡ
中川悠輔; 中川賢一
Oral presentation, Japanese, 日本物理学会,2005年秋季大会
Sep. 2005

原子干渉計を用いた重力加速度測定Ⅲ
小田悠介; 後藤亮彦; 中川賢一
Oral presentation, Japanese, 日本物理学会,2005年秋季大会
Sep. 2005

Robust and precise length correction of 25-km fiber for distribution of local oscillator
M.Musha; Y.Sato; K.Nakagawa; K.Ueda
Oral presentation, English, LEOS
Jul. 2005

Towards coherent atom optics in an atom waveguide
K. Nakagawa; M. Horikoshi
Public symposium, English, 14th International Laser Physics Workshop, 14th International Laser Physics Workshop, Kyoto
Jul. 2005

原子干渉計を用いた重力加速度測定2
小田悠介; 後藤亮彦; 中川賢一
Oral presentation, Japanese, 日本物理学会,日本物理学会第60回年会
Mar. 2005

アトムチップを用いたボーズ凝縮体生成III
堀越宗一; 中川賢一
Oral presentation, Japanese, 日本物理学会,日本物理学会第60回年次大会
Mar. 2005

光双極子トラップを用いたボーズ凝縮体の操作
鈴木祐介; 堀越宗一; 中川賢一
Oral presentation, Japanese, 日本物理学会,日本物理学会第60回年次大会
Mar. 2005

単一原子トラップ
中川悠輔; 柳瀬数昌; 中川賢一
Oral presentation, Japanese, 日本物理学会,日本物理学会第60回年次大会
Mar. 2005

Coherent manipulation of cold atoms and its applications
Ken'ichi Nakagawa; Munekazu Horikoshi; Yusuke Suzuki; Yusuke Oda; Yusuke Nakagawa
Invited oral presentation, English, International Seminar on Atomic Processes, International Seminar on Atomic Processes, Hayama, International conference
Jan. 2005

原子干渉計を用いた重力加速度測定
中川賢一; 堀越宗一; 小田悠介; 中藪剛; 金重福
Oral presentation, Japanese, 日本物理学会,日本物理学会 2004年秋季大会
Sep. 2004

アトムチップを用いたボーズ凝縮体生成II
堀越宗一; 中川悠輔; 中川賢一
Oral presentation, Japanese, 日本物理学会,日本物理学会2004年秋季大会
Sep. 2004

アトムチップを用いたボーズ凝縮体生成
堀越宗一; 鈴木祐介; 中川悠輔; 中川賢一
Oral presentation, Japanese, 日本物理学会,日本物理学会第59回年次大会
Mar. 2004

動くコイルによる冷却原子の移送
鈴木祐介; 堀越宗一; 中川賢一
Oral presentation, Japanese, 日本物理学会,日本物理学会59回年次大会
Mar. 2004

Optical Frequency Standards at Telecommunication Region : From Wavelength Measurement to Optical Frequency Measurement
大苗 敦; 中川賢一
Invited oral presentation, Japanese, 電子情報通信学会技術研究報告, 電子情報通信学会
Apr. 2003

原子導波路による原子回路
中川賢一
Oral presentation, Japanese, 日本物理学会第58回年次大会 シンポジウム
Mar. 2003

原子導波路による原子回路
中川賢一
Oral presentation, Japanese, 日本物理学会第58回年次大会 シンポジウム, 日本物理学会第58回年次大会 シンポジウム
Mar. 2003

ワイヤートラップによる原子操作Ⅲ
堀越宗一; 鈴木裕介; 中川賢一
Oral presentation, Japanese, 日本物理学会第58回年次大会
Mar. 2003

ALMA Line Length Correction System: Report on Tests in Japan
Larry D’Addario; Sarmad Al Banna; Bill Shillue; Masato Ishiguro; Akitoshi Ueda; Ken'ichi Nakagawa; Mitsuru Musha
Others, English, ALMA Memo No. 445
Feb. 2003

1.5μｍ帯アセチレン周波数安定化半導体レーザーの開発とその応用
佐藤洋平; 武者 満; 中川賢一; 植田憲一
Others, Japanese, レーザー学会 第308回研究会報告
Jan. 2003

Bose-Einstein condensation of Rb atoms and its applications to precision measurements
Ken'ichi Nakagawa; Munekazu Horikoshi
Invited oral presentation, English, The Fifth Asian International Seminar on Atomic and Molecular Physics, Invited, The Fifth Asian International Seminar on Atomic and Molecular Physics (invited talk), International conference
Oct. 2002

Optical Frequency Standards for Optical Communications and Their Applications
Ken'ichi Nakagawa
Invited oral presentation, English, Topical Workshop on the taming of Optical Frequencies, Invited, 情報通信研究機構, 東京、小金井, International conference
Sep. 2002

通信帯の光周波数標準
中川賢一; 大苗 敦
Invited oral presentation, Japanese, 第63回応用物理学会学術講演会 シンポジウム
Sep. 2002

ワイヤートラップによる原子操作Ⅱ
堀越宗一; 中川賢一
Oral presentation, Japanese, 日本物理学会2002年秋季大会
Sep. 2002

DEVELOPMENT OF OPTICAL FREQUENCY STANDARDS IN THE 1.5 MICRON REGION FOR WDM OPTICAL COMMUNICATION SYSTEMS
Ken'ichi Nakagawa; Atsushi Onae
Invited oral presentation, English, URSI (International Union of Radio Science) XXVIIth General Assembly, Invited, URSI (International Union of Radio Science) XXVIIth General Assembly (invited talk), Maarstricht, the Netherlands, International conference
17 Aug. 2002

ワイヤートラップによる原子操作
堀越宗一; 中川賢一
Oral presentation, Japanese, 日本物理学会第57回年次大会
Mar. 2002

重力測定のための冷却Rb原子を用いた原子干渉計の開発
田村誠道; 堀越宗一; 中島弥磨
Oral presentation, Japanese, 日本物理学会第57回年次大会
Mar. 2002

連続原子レーザー実現のためのRb原子のBEC生成II
飯尾能将; 堀越宗一; 中島弥磨雄; 中川賢一
Oral presentation, Japanese, 日本物理学会第57回年次大会
Mar. 2002

波長多重光通信のための光周波数標準
中川賢一; 大苗敦
Invited oral presentation, Japanese, 応用物理学会量子エレクトロニクス研究会「超精密光計測－光の位相の絶対制御－」
Jan. 2002

WDM光ファイバー通信用の光周波数標準の開発
中川賢一; 大苗 敦
Oral presentation, Japanese, 電気学会研究会 計測研究会「先端波動干渉計測」IM-02-4
Jan. 2002

連続原子レーザー実現のためのRb原子のBEC生成
飯尾能将; 塩川教次; 堀越宗一; 中川賢一
Oral presentation, Japanese, 日本物理学会2001年秋季大会
Sep. 2001

コヒーレント加算Nd:YAGレーザーの強度雑音特性
武者 満; 中川賢一; 植田憲一
Oral presentation, Japanese, 日本物理学会2001年秋季大会
Sep. 2001

冷却Rb原子干渉計の開発
田村誠道; 堀越宗一; 中川賢一
Oral presentation, Japanese, 日本物理学会2001年秋季大会
Sep. 2001

Optical Frequency Standard for Optical Fiber Communication Systems
K. Nakagawa; A. Onae
Invited oral presentation, English, AP-RASC(Asia Pacific Radio Science Conference)、東京、招待講演, International conference
Aug. 2001

Coherent Addtion of injection-locked Nd:YAG lasers
Mitsuru Musha; Takeshi Kanaya; Ken'ichi Nakagawa; Ken-ichi Ueda
Oral presentation, English, CLEO Pacific2001 2001/7/17 Makuharu
Jul. 2001

Rb原子のボーズ凝縮生成のためのダブルMOTおよび3コイル磁気トラップの評価IV
中川賢一; 上原治; 塩川教次; 飯尾能将
Oral presentation, Japanese, 日本物理学会第56回年次大会
Mar. 2001

Development of an Acetylene Optical Frequency Standard at 1.5μm and its applications
Ken'ichi Nakagawa; Atsushi Onae
Oral presentation, English, SPIE Conference Photonics WEST
Jan. 2001

高精度光源の研究動向と可能性
中川賢一
Invited oral presentation, Japanese, 電子情報通信学会ソサエティ大会、パネル討論「これからの光通信ネットワークと光周波数基準技術」
Oct. 2000

Rb原子のボーズ凝縮生成のためのダブルMOTおよび3コイル磁気トラップの評価III
上原 治; 塩川教次; 飯尾能将; 中川賢一
Oral presentation, Japanese, 日本物理学会第55回年次大会，24pYK-3
Sep. 2000

高精度1.5μm帯アセチレン光周波数標準レーザーの実用機の開発
中川賢一; 大苗敦
Oral presentation, Japanese, 2000年秋季第61回応用物理学会学術講演会，3p-M-14
Sep. 2000

Development of a Compact Acetylene Optical Frequency Standard at 1.5μm
K. Nakagawa; A. Onae; K. Okumura; J. Yoda
Oral presentation, English, Conference on Precision Electromagnetic Measurements（CPEM '2000），paper TUP1－5, Sydney
May 2000

原子干渉による精密測定
中川賢一
Invited oral presentation, Japanese, 日本物理学会 2000年春の分科会，シンポジウム「物理学と標準」，22pF-10, 日本物理学会 2000年春の分科会，シンポジウム「物理学と標準」，22pF-10
Mar. 2000

原子干渉による精密測定
中川賢一
Invited oral presentation, Japanese, 日本物理学会 2000年春の分科会，シンポジウム「物理学と標準」，22pF-10
Mar. 2000

Rb原子のボーズ凝縮生成のためのダブルMOTおよび３コイル磁気トラップの評価II
上原 治; 田村誠道; 中川賢一
Oral presentation, Japanese, 日本物理学会 2000年春の分科会，26pA-4
Mar. 2000

光周波数ネットワーク実現のための半導体レーザーの非線型波長変換
中川賢一; 武者 満; 洪 鋒雷; 大苗 敦; 石川 純; 依田 潤
Oral presentation, Japanese, 第60回応用物理学会講演予稿集
Sep. 1999

Rb原子のボーズ凝縮生成のためのダブルMOTおよび3コイル磁気トラップの評価
中川賢一; 上原 治
Oral presentation, Japanese, 日本物理学会1999年秋の分科会，24pC-6
Sep. 1999

1.5μm光通信帯における高精度光周波数標準の開発
中川賢一
Others, Japanese, TELECOM FRONTIER SCAT TECHNICAL JOURNAL
Aug. 1999

外部共振器と高感度FM分光による1.5μm帯アセチレン安定化レーザー
中川賢一; 大苗 敦
Oral presentation, Japanese, 第46回応用物理学会春季講演会予稿
Mar. 1999

1.5μm光通信帯の光周波数標準の開発
中川賢一; 大苗 敦
Public symposium, Japanese, 電気学会 計測研究会「波動干渉計測」
Feb. 1999

レーザー冷却原子および原子干渉計を用いた精密計測
中川賢一
Invited oral presentation, Japanese, 量子エレクトロニクス研究会研究討論会「レーザー冷却・原子光学」, 応用物理学会
Dec. 1998

1.5μm帯アセチレン安定化レーザーの精密周波数測定２
中川賢一; 興梠元伸; 今井一宏; 大苗 敦; 奥村謙一郎; 依田 潤
Oral presentation, Japanese, 第59回応用物理学会秋季講演会予稿
Sep. 1998

Optical Frequency Measurement of the Acetylene Transitions at 1.5μ
K. Nakagawa; A. Yamaguchi; M. Kourogi; K. Imai; A. Onae; K. Okumura; J. Yoda
Oral presentation, Japanese, Conference on precision Electromagnetic Meas urements（CPEM '98）Conference Digest
Jul. 1998

Observation and control of the atomic motion in an optical potential
K. Nakagawa; M. Kozuma
Invited oral presentation, English, US-Japan Seminar on Manipulation of Matter by Coherent Light, US-Japan Seminar on Manipulation of Matter by Coherent Light, Kusatsu, International conference
Sep. 1997

A transient response of recoil-induced resonance in cold atoms: a novel method for the observation of atomic dynamics
K. Nakagawa; M. Kozuma
Invited oral presentation, English, UEC International Symposium on Atom Optics and Coherence, Institute for Laser Science, University of Electro-Communications, Tokyo, International conference
Aug. 1995

Ultra stable Nd:YAG laser
K. Nakagawa; T. Katsuda; A. Shelkovnikov; M. Ohtsu
Oral presentation, English, Optical Society of America
Oct. 1993

Frequency stabilized diode-pumped Nd:YAG lasers and its applications
K. Nakagawa; A. Shelkovnikov; T. Katsuda; M. Ohtsu
Public symposium, English, International Symposium on Atomic Frequency Standards and Coherent Quantum Electronics, International Symposium on Atomic Frequency Standards and Coherent Quantum Electronics, Nara
Aug. 1993

Semiconductor Lasers for Highly Coherent Optical Sweep Generator
K. Nakagawa; M. Ohtsu; C.-H. Shin; M. Kourogi; Y. Kikunaga
Invited oral presentation, English, Tenth International Conference on Laser Spectroscopy, Tenth International Conference on Laser Spectroscopy, Font Romeu, France, International conference
Jun. 1991

Laser frequency stabilization with applications to atomic frequency standards
K. Nakagawa; M. Ohtsu
Invited oral presentation, English, 4th European Frequency and Time Forum (EFTF90), 4th European Frequency and Time Forum (EFTF90), Neuchatel, Switzerland, International conference
Mar. 1990

現代レーザー分光学特論
The University of Electro-Communications

現代レーザー分光学特論
電気通信大学

力学
The University of Electro-Communications

力学演習
The University of Electro-Communications

基礎電気回路
The University of Electro-Communications

基礎電気回路
The University of Electro-Communications

基礎電気回路
電気通信大学

力学演習
The University of Electro-Communications

力学演習
電気通信大学

現代レーザー分光学（集中講義）
京都大学

現代レーザー分光学（集中講義）
京都大学

基礎電子電気回路
The University of Electro-Communications

応用電磁気学
The University of Electro-Communications

現代レーザー分光学
The University of Electro-Communications

基礎電子電気回路
The University of Electro-Communications

基礎電子電気回路
電気通信大学

応用電磁気学
The University of Electro-Communications

応用電磁気学
電気通信大学

現代レーザー分光学
The University of Electro-Communications

現代レーザー分光学
電気通信大学

力学
The University of Electro-Communications

力学
電気通信大学

電気学会

Optical Society of America

レーザー学会

応用物理学会

日本物理学会

次世代高性能量子慣性センサーの開発
中川賢一
文部科学省, 光・量子飛躍フラッグシッププログラム 基礎基盤研究, 基礎基盤研究, 20182801
Oct. 2018 - Mar. 2028

リュードベリ原子を用いたアナログ量子計算プラットフォームの開発
中川賢一
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, The University of Electro-Communications, Grant-in-Aid for Scientific Research (B), 本研究はリュードベリ原子を用いた量子シミュレーターを基にアナログ量子計算を行うためのプログラマブルな量子シミュレーターを開発することが目的である。令和3年度においては、今まで開発した量子シミュレーターにおいて問題となっていたトラップアレー中の原子欠損による原子数の制限を解決するため、トラップアレー中の原子を並び替えることにより数10個の無欠損の原子アレーを実現する方法の開発を行った。これには令和2年度に導入した空間位相変調器を用いてトラップアレーの空間配置を高速に変化させて複数の原子を並び替える方法を検討した。並び替え回数および手順を少なくして最適化するためのアルゴリズムを考案し、この手順による無欠損原子アレーの生成効率の評価を行った。この結果、5×5＝25個の正方格子型の原子アレーの場合には約5.7％の効率で無欠損アレーが実現可能であることが分かり、考案した方法が十分有効であることが明らかになった。また考案した原子の並び替えの方法を実験で検証するため、以前に開発したマイクロ光トラップの実験装置の改造および整備を行って実験の準備を進めた。この装置を用いて磁気光学トラップによって生成されるレーザー冷却Rb原子が空間位相変調器によって作られる10個以上のトラップアレーにトラップされることを実験で確認した。, 20H01836
Apr. 2020 - Mar. 2023

Selective quantum manipulation of atom wave packet by amplitude modulation of the optical lattice
Watanabe Shinichi
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, The University of Electro-Communications, Grant-in-Aid for Scientific Research (C), Techniques are now available for manipulating the wave packet of ultracold atoms by first trapping them in an optical lattice which is formed by counter-propagating laser beams, and then by modulating the laser amplitude. In this study, we investigated the experimental method to selectively excite an atom to a specific excited-band by stochastic amplitude modulation, and found the shortest pulse sequence that forms a target state with almost 100% certainty. Regarding the formation of quantum entangled states of atoms, a convolutional neural-network employed in machine learning was applied to the calculation of the density matrix for the Bose-Hubbard model, and an excellent example of finite-temperature density-matrix calculation was demonstrated. These results are useful in the development of advanced quantum system-control technology as symbolized by quantum information and quantum computers., 17K05596
01 Apr. 2017 - 31 Mar. 2020

マイクロ光トラップアレー中のリドベルグ原子を用いた量子多体系の量子シミュレーター
中川賢一
Principal investigator
01 Apr. 2017 - 31 Mar. 2020

Control of dynamics and high precision measurement of ultracold atomic wave packet by temporally modulated optical lattice
Watanabe Shinichi
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, The University of Electro-Communications, Grant-in-Aid for Scientific Research (C), In the theoretical study, we examined how ultracold atoms captured near the potential minimum in a parabolic trap would behave under the influence of amplitude modulation of the optical lattice. A detailed comparison with the experiments carried out at University of Hamburg showed that attenuation of the hole state in the experiment occurs more rapidly than in the numerical calculation. We found that in a completely isolated lattice system, the hole dynamics has a very long coherence time. On the experimental side, we aimed to realize the quantum simulation of quantum many-body system using laser-cooled Rb atoms in a micro-light-trap array. We can create a quantum entanglement state involving at most 4 atoms, and we are close to realizing quantum simulation of a quantum-spin system., 26400416
01 Apr. 2014 - 31 Mar. 2017

マイクロ光トラップアレー中のリドベルグ原子を用いた量子シミュレーター
中川賢一
松尾学術振興財団, 研究助成, Principal investigator
01 Oct. 2015

光格子中のリドベルグ原子を用いた量子情報処理
2012 - 2014

Atom Optics (Technical Application of Laser Cooling)
SHIMIZU Fujio; NAKAGAWA Ken-ichi; SHUNIZU Kazuto; MORINAGA Atsuo; SHIRAHAMA Keiya; MORINAGA Makoto
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, The University of Electro-Communications, Grant-in-Aid for Scientific Research on Priority Areas, We have worked in three areas of atom optics. (1)The development of atom optics components by Shimizu's group, (2)the study of atom chips with Rb BEC by Nakagawa's group, and (3)atom interferometries by Morinaga's group. (1) Various components were demonstrated by using an ultra-cold metastable neon atomic beam. The focusing of an atomic beam with a static electric lens, arbitrary patterning of an atomic beam with a transmission type hologram made of SiN thin film were demonstrated. By depositing electrodes on the hologram of the SiN film we demonstrated real time control of holographic image of atoms. The group also experimentally verified quantum reflection on a solid surface for the first time. Furthermore, they found mat the reflectivity can be improved remarkably by modifying me slid surface. This result was applied to make a reflective type hologram, beam splitter and one dimensional focusing lens. (2) Nakagawa's group developed a rubidium BEC (the third in this country). Loading of atoms from BEC in mind, they constructed an atom chip consisting of miniature wires carrying current to guide and trap atoms. Preliminary experiment of loading laser cooled atoms was verified. The group also worked on a rubidium atom interferometer that is aimed to measure gravity G constant. (3) Morinaga's group studied on a thermal calcium atom interferometer and a laser cooled sodium atom interferometer. With calcium they measured Aharonov-Casher phase shift with an accuracy better than 3%. With sodium they demonstrated time-domain multiple interferometer that had a finesse better than 100., 11216202
1999 - 2002

Atomic wave controls of laser-cooled ultra cold atoms
NAKAGAWA Ken'ichi
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Tokyo Institute of Polytechnics, Grant-in-Aid for Scientific Research (C), The purpose of this research is to investigate fundamental physical processes and experimental techniques for control of quantum-mechanical atomic motion or atomic wave using lasers. Experimentally, I have developed extended-cavity diode laser systems for laser cooling of Rb atoms and also a glass cell ultra-high vacuum system for magnet-optical trap of Rb atoms. Using these apparatus, I have realized the cooling and trapping of about 10^8 Rb atoms with a temperature of about several hundreds of micro Kelvin. Further investigation of cooling these atoms will enable to obtain ultra cold atoms at several micro Kelvin using a help of polarization-gradient cooling. Thus, it will experimentally possible to investigate the observation and control of quantum-mechanical atomic motion in a laser light potential. Theoretically, I have analyzed a fundamental physical process of ultra cold atoms in a periodic potential created by laser standing waves, which is called a recoil-induced resonance scattering, In such a configuration, the intensity or phase of the laser field transmitted to the cold atoms change according to the relative position of the atomic wavepacket to the periodic light potential. Thus, using this method, it is possible to monitor the atomic motion or quantum mechanical atomic state in the light potential in real-time. These theoretical analysis reasonably explains our previous experimental study about recoil-induced resonance using laser cooled Rb atoms. The control of quantum mechanical atomic motion or atomic wave has been also analyzed in the same atom-light configuration and it has been demonstrated by our preliminary experiment. Such a control of atomic motion or atomic wave will be useful for various atom optics experiments., 08640516
1996 - 1997

可視光レーザーとマイクロ波を結ぶ周波数チューンの開発
中川 賢一
日本学術振興会, 科学研究費助成事業, 東京工業大学, 奨励研究(A), 可視から近赤外域のレーザー周波数測定の為の基礎技術の確立が本研究の目的であり,これに対して以下の研究を行った。 ○半導体レーザーのみを用いた周波数チューンによる光とマイクロ波を結ぶ方法を提案し,その予備実験として、657nmのCaの飽和分光を可視半導体レーザーで行い,されに半分の周波数の1315nmの半導体レーザーとの間をSHGでリンクを行った。これによって提案した周波数チューンの一段目が実現できた。 ○1.5μm帯の分子の吸収線の周波数を測定する方法も新たに提案し,これに必要なC_2H_2,HCN分子の飽和吸収に安定化したレーザーを開発し,さらに広帯域に差周波数を測定するために光周波数コム発生器を用いて、各吸収線の間隔をITHzにわたって100KHz以下の精度で測定した。又,絶対周波数を測定するために,0.778μmにあるRbの2光子吸収線と1.556μmのHCNの飽和吸収線との間の周波数リンクを実現し,HCNの吸収線の周波数を200KHz以下(10-9以下)で決定した。, 06750044
1994 - 1994

ファブリーペロ-(FP)方式干渉計の開発
藤本 眞克; 山崎 利孝; 黒田 和明; 中川 賢一; 佐々木 明; 大橋 正健; 坪野 公夫; 三尾 典克
日本学術振興会, 科学研究費助成事業, 国立天文台, 重点領域研究, 前年度に第一段階のプロトタイプ干渉計運転に成功したことを踏まえて、今年度はレーザー光の周波数安定化とモード選択を行って、干渉計の感度向上を目指すと共に、雑音源の特定と対策を試みた。 1.モードクリーナー:1m離れた2枚の独立に懸架した鏡で構成されるファブリペロ-共振器をレーザー光の周波数基準に周波数安定化を行うと同時に、その透過によってモード選択された光を干渉計の光源として利用し運転した。これにより第一段階の運転で支配的であったレーザー光の周波数雑音を減らして1kHz付近で約2桁の感度向上が達成された。さらに光源のモード選択によって干渉計のコントラストも95%から99%に向上した。 2.雑音源の検討:モードクリーナーにより周波数安定化は安定化回路の誤差信号で見積もると約4桁、20mの1本のファブリーペロ-共振器で評価すると約3桁の改善が見られるが、プロトタイプ干渉計での感度向上は約2桁に留まっている。この原因を検討した結果、モードクリーナと干渉計の間で光路調整に用いている鏡の機械的な振動が光の位相雑音を付加すると同時に光軸ゆらぎを引き起こしている可能性が大きいことが判明した。位相雑音の付加で約1桁の劣化、光軸ゆらぎは干渉計に異相雑音として作用するため、さらに約1桁の劣化をもたらすと推定されている。これへの対策として防振の強化が実施されているところである。 3.連続運転:前年度の世界初の直接干渉方式のプロトタイプ干渉計運転の成功につづいて、独立懸架のモードクリーナーを通した光でプロトタイプ干渉計を運転したのも世界初であるが、このシステムの長期安定動作を確認するために、長期運転を試みた。最長で3時間半の連続運転が達成され、ロックがはずれる原因も推定できた。, 04234108
1991 - 1994

半導体レーザーの光位相同期による高コヒーレント・高出力光の発生
中川 賢一; 吉田 清範
日本学術振興会, 科学研究費助成事業, 東京工業大学, 重点領域研究, 昨年度に引き続き半導体レーザーのコヒーレンスおよび出力向上を行うための実験を行った。コヒーレンス向上の関しては周波数安定化に用いる基準共振器の開発を主に行った。反射率99.99%以上のスーパーキャビティー用ミラーを用いてフィネス約20、000で共振線幅数10kHzを得る事ができた。またこれを真空チェンパーの中にワイヤーで釣ることによって防音・防振を行い、基準共振器の安定度向上を行った。また安定化レーザーの周波数安定度の評価およびレーザーの絶対周波数安定化のためにCa原子の超高分解能分光を行うつもりで、これに必要な線幅10kHz以下の657nmレーザー光源を可視半導体レーザーと回折格子による外部共振器を用いて実現した。高出力化に関しては複数のレーザー出力のコヒーレントな足し合わせ(コヒーレント重畳)を行った。出力100mWのAlGaAs高出力半導体レーザーを用い、注入同期によって3台のレーザーの周波数を一致させ、各々の出力の光位相を制御することによって出力の足し合わせを行う事ができた。足し合わせの効率は2台の時には約85%、3台の時には68%が得られた。今後さらにレーザーの数を増やしていく事によって1W近い出力を得る事も可能になる。(中川) 半導体レーザーからの強度スクィーズド光発生の実験を行うつもりでおりその準備を今回行った。AlGaAs半導体レーザーを液体窒素によって約-200℃に冷却することによってしきい値電流を数mA程度まで下げることができた。これによってスクィーズド光発生に必要なしきい値の10倍以上の注入電流が得られる事になり、さらにスクィズド光が発生しているかどうか強度雑音スペクトル測定を行っていくつもりである。(吉田), 04234204
1992 - 1992

Realization of a highly accurate optical frequency measurement system by novel frequency chain
OHTSU Motoichi; HIRANO Masahiro; NAGAI Haruo; SAKUMA Eiichi; TERAMACHI Yasuaki; NAKAGAWA Kenichi
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Tokyo Institute of Technology, Grant-in-Aid for Developmental Scientific Research (B), By applying a negative electrical feedhack to a multi-quantum well distributed feedback laser at 1.5 um wavelength, its spectral linewidth was reduced to 250 Hz. By using this laser as the master laser for an infection locking system, improvement of coherence and frequency stabilization of a high power laser was realized. An optical frequency comb generator was developed to generate an intermediate frequency signal. That is, modulation sidebands over 4 THz frequency span was realized by modulating the master laser by using an electro-optical modulator installed in a Fabry-Perot cavity. By irradiating a 1.5 um-wavelength semiconductor laser light and 1.0 um-wavelength YAG laser light to a lithium niobate crystal of 310ﾟC, a sumfrequency signal between these lasers was generated. Its wavelength and power were 0.63 um and 0.7 uW, respectively. An optical phase locking was realized by mixing this signal with a frequency-stabilized Hi-Ne laser light. The phase error variance was reduced to as low as 0.05 radian^2, from which a stable homodyne optical phase socking was confirmed. By the results obtained above, a frequency chain for frequency measurement system was realized between the primary frequency standard using a He-Ne laser and the secondary frequency standard using a narrow-linewidth semiconductor laser of 1.5 um-wavelengh. Furthermore, optical frequency comb generator was developed to connect the secondary frequency standard and the laser under measurement. The accuracy of frequency measurement was estimated to be as high as 1 x 10^<-10>, by which the optical frequency measurement with the highest accuracy was confirmed. As an application of the present optical frequency measurement system, a novel frequency chain for the wavelength of 0.6 - 1.3 um was proposed by using a calcium spectral line at 0.65 um-wavelength as the frequency standard and nine semiconductor lasers as slave oscillator. Experiments on the second harmonic and sum-frequency generations for this system were carried out., 03555006
1991 - 1992

Realization of a manipulator by a photon scanning tunneling microscope for a single atom crystal growth
OHTSU Motoichi; NAKAGAWA Ken'ichi
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Tokyo Institute of Technology, Grant-in-Aid for General Scientific Research (B), Theory of a photon scanning tunneling microscope (PSTM) was developed by using the concept of a virtual photon. The result agreed well with the experimental results. Although the conventional theories have relied on the electromagnetic wave analysis being difficult for intuitive understanding, it was confirmed that the present theory could overcome this difficulty. Based on this theory, a manipulator was designed for trapping a freely flying single atom in vacuum by an evanescent light emitted from the top of an optical fiber probe for the PSTM. For this design, depth of trapping potential, optimum radius of curvature of the optical fiber probe, and required wavelength of light for about twenty species of atoms were estimated. A method of sharpening the top of the optical fiber probe was developed by using a selective etching technique. The probe with the cone-angle of 15 degree and the radius of curvature smaller than 2 nm was realized. The deviation of the cone-angle was maintained within 0.5 degree, by which high reproducibility of this method was confirmed. A method of fabricating a small aperture at the top of the metal-coated sharpened optical fiber probe was also developed. The performances of the PSTM system was improved to increase the measurement speed and resolution. The resultant measurement speed was ten times that of the previous system. The resolution was estimated as 2nm, which is about 10 times higher than that of the conventional system, through the measurements of the bacteriophage T4. Momentum exchange between the evanescent light and rubidium atoms were confirmed by measuring the absorption spectral broadening in rubidium under irradiation of evanescent field. The magnitude of this exchange was sufficiently large for a single rubidium atom trapping. A nonlinear optical wavelength conversion system was designed and preliminary experiments were carried out for realizing 200 - 300 nm wavelength coherent light for the present manipulator combining semiconductor lasers and solid-state lasers. By the present results of study, the present PSTM system was con- firmed to have sufficiently high performances to be used as a manipulator for trapping a single atom., 03452089
1991 - 1992

レーザー冷却原子を用いた共振器量子電気力学の研究
中川 賢一
日本学術振興会, 科学研究費助成事業, 東京工業大学, 奨励研究(A), 03740198
1991 - 1991

半導体レ-ザ-の光位相同期による高コヒ-レント・高出力光の発生
中川 賢一
日本学術振興会, 科学研究費助成事業, 東京工業大学, 重点領域研究, 本研究では半導体レ-ザ-において周波数の安定化を行ってそのコヒ-レンスを向上し,さらにこれを注入同期や光位相同期によって出力を増幅及びコヒ-レント重量を行って高コヒ-レントかつ高出力光を得る事が目的である。半導体レ-ザ-のコヒ-レンス向上に関しては既に1OHZ以下の線幅が光帰還法及び注入電流制御によって得られている。さらに今回は、従来の方法では取り除けなかったレ-ザ-の強度雑音の影響をFM変調法を用いて充分抑圧する事ができ,7OOHz以下の線幅を得る事ができた。今後さらに制御の最適化や,基準共振器の安定化を行えば,周波数雑音を調論的限界であるショット雑音で決まる値まで抑圧できると考えられ,この時の線幅は1mHz以下が期待される。一方,高出力化に関しては、コヒ-レンスを向上した比較的低出力のマスタ-レ-ザ-を多モ-ド発振する高出力スレ-ブレ-ザ-に注入同期を行ってスレ-ブレ-ザ-の単一モ-ド化及び高コヒ-レント化を行った。この結果、約1mwのマスタ-レ-ザ-注入パワ-に対して40mw以上において注入同期が確認され,スレ-ブレ-ザ-の線幅もマスタ-レ-ザ-とほとんど同じである事が確認された。この為、両レ-ザ-間の光位相同期を行う事ができ,さらに光出力の足し合わせ(コヒ-レント重畳)を行う事ができた。現在のところ足し合わせの効果はまだ必ずしも高くないが,今後モ-ドマッチングの精度を上げる事によって向上できると考えられる。この様に.今年度においては高コヒ-レント化及び高出力化の種々の方法が実験によって原理的に確認する事ができたため今後さらに実験を進めてその性能向上を行う予定である。, 03250205
1991 - 1991

有機超薄膜評価用の超解像光走査トンネル顕微鏡の開発と近視野電磁場解析法の確立
大津 元一; 寺町 康昌; 中川 賢一
日本学術振興会, 科学研究費助成事業, 東京工業大学, 一般研究(B), 近視野での波動光学の解析を行った結果、測定感度、及び横、縦分解能が互いに、相関を持ち、ショット雑音限界では横分解能は10nm、縦分解能は1nmという優れた値が得られることが判明した。これにより近視野電磁場解析の基礎を確立することが出来た。 ファイバ・ピックアップの先鋭化をフッ酸溶液により行う方法を見いだし、先端曲率半径80nm以下のものをつくることが出来た。また、電子ビ-ム蒸着法によりクロム、金薄膜を先端に均一蒸着することができた。微小開口は放電法、衝突法で作成することができ、開口径20nm以下のファイバ・ピックアップの作成法を確立した。 光源としての半導体レ-ザの高コヒ-レント化に成功し、スペクトル線幅7Hz、を得た。また、参照用の共振器の共振周波数を掃引することによりこのレ-ザの波長を精密に5nmの範囲にわたり掃引した。 光走査トンネル顕微鏡のシステムを製作した。分解能を評価するために厚さ15nmのSiO_2薄膜、さらに複眼光メモリ-の表面形状を測定した結果、横分解能20nm以内、縦分解能1nmが得られた。これは有機超薄膜中の微小開口、リン脂質、などの形状測定には十分な性能であり、有機超薄膜評価用の優れたシステムであることを確認した。 さらに高分解能の光走査トンネル顕微鏡を新たに提案した。これは端面に微小開口を持ったファブリ・ペロ-共振器をプロ-ブとし、その共振周波数の微小シフト量を測定する方法を採用している。つまり、これは反射共振型と呼ぶべきものである。これによる横、縦分解能のショット雑音限界はそれぞれ1nm,0.1nm以内であることが判明した。 また、これらのプロ-ブを用い、原子の動きの操作、さらに単原子の結晶成長の可能性を提案した。, 02452084
1990 - 1990