理学博士, 東京大学

極高真空度測定

光ピンセット

量子反射

原子干渉計

原子光学

レーザー冷却・トラップ

レーザー分光学

Optical Tweezer Measurement of extreamly high vacuum using trapped atoms

Quantum Reflection

Atom Interferometer

Atom Optics

Laser Cooling/Trapping

Laser Spectroscopy

Natural sciences, Semiconductors, optical and atomic physics

The University of Electro-Communications Graduate School of Informatics and Engineering, Faculty of Informatics and Engineering, Department of Engineering Science, Graduate School of Informatics and Engineering, Faculty of Informatics and Engineering Dep, Professor,Researcher

1969
The University of Tokyo, College of Arts and Sciences, Department of Basic Science, Japan

1969
The University of Tokyo, Faculty of Liberal Arts

代議員, 日本物理学会, Society, 日本物理学会

極低温準安定状態アルゴン原子回折パターンの観測
2010, 日本物理学会講演概要集, 65, 1, 213

準安定状態ヘリウム原子の光双極子トラップの研究
2010, 日本物理学会 講演概要集, 65, 1, 214

Observation of a coherence loss of an atomic wave scattered from the optical potential in a Talbot-Lau atom interferometer
Takuya Kohno; Shinya Suzuki; Kazuko Shimizu
A coherence loss of an atomic wave scattered from the optical potential in an interferometer is observed. A Talbot-Lau atom interferometer is developed for that measurement using a laser-cooled lithium atomic beam. The long de Broglie wavelength of slow lithium atoms gives a short Talbot length and makes it possible to construct a small and stable atom interferometer., AMER PHYSICAL SOC, Nov. 2007, PHYSICAL REVIEW A, 76, 5, 053624-1-053624-5, English, 1050-2947, WOS:000251326400134

Observation of a coherence loss of an atomic wave scattered from the optical potential in a Talbot-Lau atom interferometer
Takuya Kohno; Shinya Suzuki; Kazuko Shimizu
A coherence loss of an atomic wave scattered from the optical potential in an interferometer is observed. A Talbot-Lau atom interferometer is developed for that measurement using a laser-cooled lithium atomic beam. The long de Broglie wavelength of slow lithium atoms gives a short Talbot length and makes it possible to construct a small and stable atom interferometer., AMER PHYSICAL SOC, Nov. 2007, PHYSICAL REVIEW A, 76, 5, 053624-1-053624-5, English, 1050-2947, WOS:000251326400134

固体表面における超低速準安定状態ヘリウム原子ビームの反射
2007, 日本物理学会講演概要集, 62, 1, 153

ラゲールガウスモードビームの発生と光ピンセットへの応用
2006, レーザー顕微鏡研究会第３２回講演会抄録集, 17-19

ラゲールガウスモードビームの発生と光トラッピングへの応用
2006, 光学, 35, 12

Quantum reflection of He-* on silicon
H Oberst; Y Tashiro; K Shimizu; F Shimizu
A cold beam of He-* (2 S-3(1)) atoms is used at grazing incidence to study the quantum reflection on a flat polished silicon surface. We measure the reflectivity as a function of the normal incident velocity component between 3 and 30 cm/s. Our result is in reasonable agreement with a calculation of the attractive van der Waals surface potential using the dielectric function of Si and the dipole polarizability of He-*. We discuss the influence of the conductivity and of a thin oxide layer on the potential. By comparing our data to those previously measured with Ne-* atoms, we are also able to confirm the scaling of the reflectivity with atomic mass., AMERICAN PHYSICAL SOC, May 2005, PHYSICAL REVIEW A, 71, 5, 052901-1-052901-8, English, 1050-2947, WOS:000229543600074

Quantum reflection of He-* on silicon
H Oberst; Y Tashiro; K Shimizu; F Shimizu
A cold beam of He-* (2 S-3(1)) atoms is used at grazing incidence to study the quantum reflection on a flat polished silicon surface. We measure the reflectivity as a function of the normal incident velocity component between 3 and 30 cm/s. Our result is in reasonable agreement with a calculation of the attractive van der Waals surface potential using the dielectric function of Si and the dipole polarizability of He-*. We discuss the influence of the conductivity and of a thin oxide layer on the potential. By comparing our data to those previously measured with Ne-* atoms, we are also able to confirm the scaling of the reflectivity with atomic mass., AMERICAN PHYSICAL SOC, May 2005, PHYSICAL REVIEW A, 71, 5, 052901-1-052901-8, English, 1050-2947, WOS:000229543600074

リング型磁気光学トラップII
2005, 日本物理学会第60回年次大会, 26pYE6

Atom optics using solid surfaces and surface structures
H. Oberst; J. Fujita; D. Kouznetsov; K. Shimizu; F. Shimizu
A cold beam of metastable helium atoms is used to study the quantum reflection on solid surfaces and surface structures. The results are applied to construct reflection-type atom optical devices, such as diffraction gratings., 2005, IQEC, International Quantum Electronics Conference Proceedings, 2005, 127-129, English, 33846485555

Talbot-Lau interferometer with cold lithium atoms
Takuya Kohno; Shinya Suzuki; Kazuko Shimizu
A Talbot-Lau type atom interferometer using cold lithium atoms in a magneto-optical trap is built and the visibility of interference fringes is measured as a function of the de Broglie wavelength. The wavelength dependence of the visibility is clearly shown. The decrease of fringe visibility due to photon scattering is presented., 2005, IQEC, International Quantum Electronics Conference Proceedings, 2005, 689-690, English, 33846492919

Generation of Laguerre-Gaussian mode beam and measurement of its angular momentum
Kazuko Shimizu; Takashi Fukuhara; Jun Moizumi
We demonstrate a simple method to generate arbitrarily higher-order Laguerre-Gaussian mode beams using an optical cavity and an astigmatic mode converter. The rotation of small polystyrene particles trapped within the ring of Laguerre-Gaussian beam is observed., 2005, IQEC, International Quantum Electronics Conference Proceedings, 2005, 796-797, English, 33846495483

Fresnel diffraction mirror for an atomic wave
H Oberst; D Kouznetsov; K Shimizu; J Fujita; F Shimizu
We have experimentally demonstrated a material-independent mirror for atomic waves that uses the Fresnel diffraction at an array of parallel ridges. He* (2 S-3(1)) and Ne* (1s(3)) atomic waves were reflected coherently on a silicon plate with a microfabricated grating structure, consisting of narrow wall-like ridges. We measured the reflectivity at grazing incidence as a function of the incident velocity and angle. Our data show that the reflectivity on this type of mirror depends only on the distance between the ridges, the wavelength, and the incident angle, but is insensitive to the material of the grating structure. The reflectivity is observed to increase by 2 orders of magnitude, compared to that of a flat polished silicon surface, where the reflection is caused by the attractive surface potential. For He* atoms, the measured reflectivity exceeds 10% for normal incident velocities below about 25 cm/s., AMERICAN PHYSICAL SOC, Jan. 2005, PHYSICAL REVIEW LETTERS, 94, 1, 013203, English, 0031-9007, WOS:000226308000030

Atom optics using solid surfaces and surface structures
H. Oberst; J. Fujita; D. Kouznetsov; K. Shimizu; F. Shimizu
A cold beam of metastable helium atoms is used to study the quantum reflection on solid surfaces and surface structures. The results are applied to construct reflection-type atom optical devices, such as diffraction gratings., 2005, IQEC, International Quantum Electronics Conference Proceedings, 2005, 127-129, English, 33846485555

Talbot-Lau interferometer with cold lithium atoms
Takuya Kohno; Shinya Suzuki; Kazuko Shimizu
A Talbot-Lau type atom interferometer using cold lithium atoms in a magneto-optical trap is built and the visibility of interference fringes is measured as a function of the de Broglie wavelength. The wavelength dependence of the visibility is clearly shown. The decrease of fringe visibility due to photon scattering is presented., 2005, IQEC, International Quantum Electronics Conference Proceedings, 2005, 689-690, English, 33846492919

Generation of Laguerre-Gaussian mode beam and measurement of its angular momentum
Kazuko Shimizu; Takashi Fukuhara; Jun Moizumi
We demonstrate a simple method to generate arbitrarily higher-order Laguerre-Gaussian mode beams using an optical cavity and an astigmatic mode converter. The rotation of small polystyrene particles trapped within the ring of Laguerre-Gaussian beam is observed., 2005, IQEC, International Quantum Electronics Conference Proceedings, 2005, 796-797, English, 33846495483

Fresnel diffraction mirror for an atomic wave
H Oberst; D Kouznetsov; K Shimizu; J Fujita; F Shimizu
We have experimentally demonstrated a material-independent mirror for atomic waves that uses the Fresnel diffraction at an array of parallel ridges. He* (2 S-3(1)) and Ne* (1s(3)) atomic waves were reflected coherently on a silicon plate with a microfabricated grating structure, consisting of narrow wall-like ridges. We measured the reflectivity at grazing incidence as a function of the incident velocity and angle. Our data show that the reflectivity on this type of mirror depends only on the distance between the ridges, the wavelength, and the incident angle, but is insensitive to the material of the grating structure. The reflectivity is observed to increase by 2 orders of magnitude, compared to that of a flat polished silicon surface, where the reflection is caused by the attractive surface potential. For He* atoms, the measured reflectivity exceeds 10% for normal incident velocities below about 25 cm/s., AMERICAN PHYSICAL SOC, Jan. 2005, PHYSICAL REVIEW LETTERS, 94, 1, 013203, English, 0031-9007, WOS:000226308000030

ラゲールガウスビームの角運動量の観測
2004, 日本物理学会, 15aTG11

Reflective double slit atom interferometer
T Kohno; F Shimizu; J Fujita; K Shimizu
A double slit atom interferometer with a reflective double slit that is formed on a flat silicon surface is demonstrated. The result shows that quantum reflection is a promising mechanism to construct stable highly accurate atom-optical devices., PHYSICAL SOC JAPAN, Mar. 2003, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 72, 3, 461-463, English, 0031-9015, 110001974243, WOS:000181678000001

Reflective double slit atom interferometer
T Kohno; F Shimizu; J Fujita; K Shimizu
A double slit atom interferometer with a reflective double slit that is formed on a flat silicon surface is demonstrated. The result shows that quantum reflection is a promising mechanism to construct stable highly accurate atom-optical devices., PHYSICAL SOC JAPAN, Mar. 2003, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 72, 3, 461-463, English, 0031-9015, WOS:000181678000001

Bright Atomic Beam by a Temporal Zeeman Acceleration
FUKUYAMA Y; KANOU H; BALYKIN V I; SHIMIZU K
2000, Applied Physics B, 70, 4, 561-565, 0946-2171, 80011546527

Imaging of an atomic beam with electrostatic Lenses
2000, Physical Review A, 61, 041601-1-4

Bright Atomic Beam by a Temporal Zeeman Acceleration
2000, Applied Physics B, 70, 4, 561-565, 0946-2171, 80011546527

Imaging of an atomic beam with electrostatic Lenses
2000, Physical Review A, 61, 041601-1-4

Two-Dimentional Subrecoil Laser Cooling
LAWALL J; BARDOU F; SAUBAMEA B; SHIMIZU K; LEDUC M; ASPECT A; COHEN‐TANNOUDJI C
1994, Phys. Rev. Lett., 73, 14, 1915-1918, 0031-9007, 80007868727, 10056921

Sub-recoil laser cooling with precooled atoms
1994, C. R. Acad. Sci. Paris,, t.318, sepII, 877-885

Two-dimensional subrecoil laser cooling
J. Lawall; F. Bardou; B. Saubamea; K. Shimizu; M. Leduc; A. Aspect; C. Cohen-Tannoudji
We report the first observation of subrecoil laser cooling in two dimensions by velocity selective coherent population trapping. We have compressed the momentum distribution of a cloud of trapped metastable helium atoms along two orthogonal axes to δp=k4, where k is the photon momentum. The corresponding temperature, 16 times below the single-photon recoil temperature, is 250 nK. Atoms are pumped into a nonabsorbing state exhibiting four well-resolved momentum peaks with subrecoil widths. The momentum space density in the peaks is significantly greater than that in the uncooled distribution. © 1994 The American Physical Society., 1994, Physical Review Letters, 73, 14, 1915-1918, English, 0031-9007, 80007868727, 10056921, 0028763230

Sub-recoil laser cooling with precooled atoms
1994, C. R. Acad. Sci. Paris,, t.318, sepII, 877-885

Quadratic collisional loss rate of a Li trap
KAWANAKA J; SHIMIZU K; TAKUMA H; SHIMIZU F
1993, Phys. Rev. A,, 48, 2, R883-R885, 1050-2947, 9909788

Generation of an Intense Low-Velocity Metastable-Neon Atomic Beam
1993, Appl. Phys. B,, B56, 1, 21-24

Quadratic collisional loss rate of a Li trap
1993, Phys. Rev. A,, 48, 2, R883-R885, 1050-2947, 9909788

Generation of an Intense Low-Velocity Metastable-Neon Atomic Beam
1993, Appl. Phys. B,, B56, 1, 21-24

Stark Phase Shift and Deflection in the Ultra-Cold Atomic Interferometer
1992, Jpn. J. Appl. Phys., 31, 4A, L436-L438

Stark Phase Shift and Deflection in the Ultra-Cold Atomic Interferometer
1992, Jpn. J. Appl. Phys., 31, 4A, L436-L438

Laser cooling and trapping of LI
Zhong Lin; Kazuko Shimizu; Mingsheng Zhan; Fujio Shimizu; Hiroshi Takuma
Neutral7Li and6Li atoms are laser cooled and trapped using the 22P3/2(F=3)<
-->
-22S1/2(F=2) and 22P3/2(F=5/2)<
-->
22S1/2(F=3/2) transitions, respectively. The Zeeman tuning is employed in the deceleration stage. Using a magneto-optical trap with a tetrahedral laser-beam configuration the atomic density of 3 x 109 atoms/cm3 is obtained for7Li and a half of that for6Li. The measured temperature of the trapped7Li atoms is 350 ±40 µK when the detuning is 8 MHz to the red. © 1991 The Japan Society of Applied Physics., 1991, Japanese Journal of Applied Physics, 30, 7, 1324-1326, English, 1347-4065, 0026188257

Laser cooling and trapping of LI
Zhong Lin; Kazuko Shimizu; Mingsheng Zhan; Fujio Shimizu; Hiroshi Takuma
Neutral7Li and6Li atoms are laser cooled and trapped using the 22P3/2(F=3)<
-->
-22S1/2(F=2) and 22P3/2(F=5/2)<
-->
22S1/2(F=3/2) transitions, respectively. The Zeeman tuning is employed in the deceleration stage. Using a magneto-optical trap with a tetrahedral laser-beam configuration the atomic density of 3 x 109 atoms/cm3 is obtained for7Li and a half of that for6Li. The measured temperature of the trapped7Li atoms is 350 ±40 µK when the detuning is 8 MHz to the red. © 1991 The Japan Society of Applied Physics., 1991, Japanese Journal of Applied Physics, 30, 7, 1324-1326, English, 1347-4065, 0026188257

Direct Observation of Hyperfine Splittings of the ⁷Li²P(3/2)State by Subnatural Linewidth Spectroscopy
SHIMIZU F; SHIMIZU K; GOMI Y; TAKUMA H
1987, Phys. Rev. A, 35, 7, 3149-3151, 1050-2947, 80003473594, 9898523

Direct Observation of Hyperfine Splittings of the ⁷Li²P(3/2)State by Subnatural Linewidth Spectroscopy
1987, Phys. Rev. A, 35, 7, 3149-3151, 1050-2947, 80003473594, 9898523

Selective Vibrational Pumping of a Molecular Beam by a Stimulated Raman Process
SHIMIZU F; SHIMIZU K; TAKUMA H
1985, Phys. Rev. A,, 31, 5, 3132-3138, 1050-2947, 80002560088, 9895866

Selective Vibrational Pumping of a Molecular Beam by a Stimulated Raman Process
1985, Phys. Rev. A,, 31, 5, 3132-3138, 1050-2947, 80002560088, 9895866

LASER-INDUCED FLUORESCENCE-SPECTRA OF THE A3-PI-U-X1-SIGMA-G+ BAND OF NA-2 BY MOLECULAR-BEAM
K SHIMIZU; F SHIMIZU
AMER INST PHYSICS, 1983, JOURNAL OF CHEMICAL PHYSICS, 78, 3, 1126-1131, English, 0021-9606, WOS:A1983QA36200016

Laser induced fluorescence spectra of the a 3Πu-X 1Σg + band of Na2 by molecular beam
Kazuko Shimizu; Fujio Shimizu
Laser induced fluorescence spectra of the a 3Πu-X 1Σg + band of Na2 are studied using the crossed molecular beam and laser technique in the wavelength region 14 700-16 000 cm-1. All band origins of a 3Π u0-X 1Σg +, ν″=0 transitions in this wavelength region are observed. Their wavelengths are tabulated and analyzed. © 1983 American Institute of Physics., 1983, The Journal of Chemical Physics, 78, 3, 1126-1131, English, 0021-9606, 36749110978

応用物理学会

日本物理学会

Japan Society of Applied Physics

Physical Society of Japan

トラップ原子による極高真空度の測定
2007

Measurement of extremly high vacuum using cold atom trap
2007

光ピンセットの研究
2002

Development of optical tweezers
2002

極低温希ガス原子の固体表面における量子反射の研究
2001

Quantum Reflection of ultra-slow metastable rare gas atomic beam on solid surfaces
2001

中性原子のレーザー冷却

原子光学

Laser Cooling of Neutral Atoms

Atom Optics