工学, 電気通信大学

新奇レーザー開発

セラミックレーザー

レーザー加工

生体イメージング

モード同期レーザー

中赤外レーザー

Nanotechnology/Materials, Optical engineering and photonics

Oct. 2021
The University of Electro-Communications, Center For Neuroscience And Biomedical Engineering, 兼任 准教授

Nov. 2018
電気通信大学レーザー新世代研究センター, 准教授

Nov. 2013 - Oct. 2018
電気通信大学レーザー新世代研究センター, 助教

Oct. 2011 - Oct. 2013
University of Southampton, Optoelectronics Research Centre, Research Fellow

01 Apr. 2006 - 31 Mar. 2007
キヤノン株式会社

Apr. 2007 - Mar. 2010
The University of Electro-Communications

Apr. 1997 - Mar. 2000
宇都宮東高校

Jan. 2024 - Present
現地実行委員, ASSL

Apr. 2023 - Present
応用物理学会 学術講演会 プログラム委員

Apr. 2023 - Present
中赤外レーザー技術専門委員会, レーザー学会

Nov. 2020 - Present
ALPS program committee member

Apr. 2017 - Present
委員 第２グループ(新レーザー技術・新レーザー応用技術), 電子情報通信学会エレクトロニクスソサイエティ 超高速光エレクトロニクス研究会

Jul. 2016 - Present
幹事, レーザー学会東京支部

May 2015 - Present
幹事, レーザー学会 「ファイバーレーザー技術」専門委員会

Apr. 2023 - Jan. 2024
レーザー学会 第44回年次大会 B部門プログラム委員主査

Jan. 2020 - Dec. 2023
ASSL program committee member, Others

May 2017 - May 2023
運営理事, レーザ協会

Apr. 2020 - Mar. 2022
幹事, 応用物理学会 フォトニクス分科会

Jun. 2016 - Mar. 2020
研究委員, 一般社団法人レーザー学会

Nov. 2017 - Mar. 2019
委員, 電気学会 先端コヒーレント光源技術調査専門委員会

2017 - 2019
CLEO program committee member, Others

Mar. 2024
レーザー学会東京支部
ミトコンドリアの観察に向けた可視域広視野フォトサーマル顕微鏡の開発
ポスター講演 支部長賞 (指導学生の受賞), 丸山朋希;戸倉川正樹

Apr. 2022
The 11th Advanced Lasers and Photon Sources（ALPS'22）, 指導学生の受賞
The Best Student Oral Paper Award (ALPS2022 指導学生の受賞), Anna Suzuki;Sascha Kalusniak;Hiroki Tanaka;Mario Br□tzam;Steffen Ganschow;Masaki Tokurakawa;Christian Kraenkel
International society

Sep. 2021
応用物理学会, 指導学生を筆頭著者とした発表
Tm添加sesquioxide媒質を用いたカーレンズモード同期レーザー
第82回応用物理学会秋季学術講演会 講演奨励賞, 鈴木 杏奈;Kr□nkel Christian;戸倉川 正樹
Japan society

Jan. 2021
レーザー学会学術講演会第41回年次大会, 筆頭著者は指導学生
Tm添加媒質を用いた複合利得発振器
論文発表奨励賞, 鈴木杏奈;Christian Kr□nkel;戸倉川正樹

May 2018
一般社団法人レーザー学会
In band 励起を用いたモード同期Tm3+:Sc2O3レーザーの開発
レーザー学会奨励賞
Japan society

Mar. 2018
1611nmファイバーレーザ励起カーレンズモード同期Tm:Sc2O3レーザーの開発
第18回「レーザー学会東京支部研究会」電気学会 光・量子デバイス技術研究会 ポスター賞 指導学生の受賞, 藤田慧祐、鈴木杏奈、戸倉川正樹、Christian Kraenkel
Japan society

Feb. 2017
一般社団法人 電気学会
波長2 μm帯Tm添加固体・ファイバーレーザーの開発
研究会奨励賞 一般社団法人 電気学会, 戸倉川正樹、益子裕、藤田慧祐
Japan society

May 2016
The 5th Advanced Lasers and Photon Sources Conference ALPS’16
High power narrow-linewidth linearly-polarized 1610 nm Er:Yb all-fiber MOPA
Best Student Poster Presentation Award (ALPS16 指導学生の受賞), E. Fujita, Y. Mashiko, and M. Tokurakawa
International society

2008
応用物理学会
カーレンズモード同期 Yb3+:Lu2O3:Y2O3複合セラミックレーザー
講演奨励賞 平成20年春季第55回応用物理学会学術講演会

2008
Research promotion Award in Advanced Solid-State Photonics

Comparison of Mode-locked Tm3+:YScO3 Mixed Sesquioxide Laser and Tm3+:Lu2O3/Tm3+:Sc2O3 Combined Active Gain Media Laser
Anna Suzuki; Sascha Kalusniak; Steffen Ganschow; Christian Kränkel; Masaki Tokurakawa
APLS2023, Sep. 2023

Kerr-lens mode-locked 49-fs Tm3+:YScO3 single-crystal laser at 2.1 µm
Anna Suzuki; Sascha Kalusniak; Steffen Ganschow; Christian Kränkel; Masaki Tokurakawa
Last, Opt. Lett., 48, 4221-4224, Aug. 2023, Peer-reviwed

Laser Operation of Czochralski-grown Tm3+-doped Mixed Sesquioxides at 2.1 µm
Suzuki, Anna; Kalusniak, Sascha; Tanaka, Hiroki; Ganschow, Steffen; Tokurakawa, Masaki; Kränkel, Christian
Advanced Solid State Lasers2022, ATu3A.4, 16 Dec. 2022, Peer-reviwed, False
International conference proceedings, English

Spectroscopy and 2.1 µm laser operation of Czochralski-grown Tm3+:YScO3 crystals
An. Suzuki; S. Kalusniak; H. Tanaka; M. Brützam; S. Ganschow; M. Tokurakawa; C. Kränkel
Optics Express, 30, 42762-42771, 04 Nov. 2022, Peer-reviwed
Scientific journal, English

Spectroscopy and continuous wave laser operation of Tm3+-doped YScO3 mixed sesquioxide crystal
A. Suzuki; S. Kalusniak; H. Tanaka; M. Brützam; S. Ganschow; M. Tokurakawa; C. Kränkel
Europhoton Conference, THU-SSL-5.7, 01 Sep. 2022, Peer-reviwed
International conference proceedings, English

700 µJ 42 ns 2 μm Tm fiber laser system and their laser orocessing of polymers, Si and Ge wafers
Takumi Yatsuda; Masaki Tokurakawa
ALPS2022, ALPS-P-20, 20 Apr. 2022, Peer-reviwed
International conference proceedings, English

Growth, spectroscopy, and laser operation of Tm3+:YScO3 mixed sesquioxide crystal
Anna Suzuki; Sascha Kalusniak; Hiroki Tanaka; Mario Brützam; Steffen Ganschow; Masaki Tokurakawa; Christian Kränkel
The 11th Advanced Lasers and Photon Sources（ALPS'22）, Apr. 2022
International conference proceedings

Tm 添加媒質を用いたカーレンズモード同期レーザー
鈴木 杏奈; Christian Kränkel; 戸倉川 正樹
フォトニクスニュース第21号, 応用物理学会フォトニクス分科会, 7, 3, 96, 22 Dec. 2021, Invited
International conference proceedings, Japanese

Sub-9 Optical-cycle Kerr-lens Mode-locked Combined Gain Media Laser Based on Tm-doped Sesquioxide
A. Suzuki; C. Kränkel; M. Tokurakawa
CLEO/Europe-EQEC 2021, CA-5.2, 23 Jun. 2021, Peer-reviwed
International conference proceedings, English

Sub-6 optical-cycle Kerr-lens mode-locked Tm:Lu2O3 and Tm:Sc2O3 combined gain media laser at 2.1 μm
A. Suzuki; C. Kränkel; M. Tokurakawa
Opt. Express, 29, 19465-19471, Jun. 2021, Peer-reviwed
Scientific journal, English

Combined Gain Media 60 fs Kerr-Lens Mode-Locked Laser Based on Tm:Lu2O3 and Tm:Sc2O3
A. Suzuki; C. Kränkel; M. Tokurakawa
CLEO 2021, SF2M.6, 14 May 2021, Peer-reviwed
International conference proceedings, English

Few ns Q-switched Tm fiber laser
Takumi Yatsuda, Masaki Tokurakawa
ALPS2021, ALPS-Poster-10, 20 Apr. 2021, Peer-reviwed, False
International conference proceedings, English

2 μm mode-locked lasers with normal dispersion Tm doped gain fibers
Yuya Uchizono; Takumi Sato; Yuhao Chen; Raghuraman Sidharthan; Seong Woo Yoo; Masaki Tokurakawa
ALPS2021, ALPS-Poster-11, 20 Apr. 2021, Peer-reviwed
International conference proceedings, English

レーザー加工のための波長2µm帯短パルスTmレーザー光源の開発
戸倉川正樹; 鈴木杏奈; 矢津田匠海
レーザー加工学会誌, 28, 1, 3-8, Feb. 2021, Peer-reviwed
Scientific journal, Japanese

NiS2 as a broadband saturable absorber for ultrafast pulse lasers
P. Wang; H. Zhang; Y. Yin; Q. Ouyang; Y. Chen; E. Lewis; G. Farrell; M.Tokurakawa; S. W. Harun; C. Wang; S. Li
Optics & Laser Technology, 132, 106492, 20 Jul. 2020, Peer-reviwed
Scientific journal, English

1650 nm broad-stripe diode in-band pumped Tm:Lu2O3 ceramic laser
N. Kikuchi; A. Suzuki; M. Tokurakawa
ALPS2020, ALPSp16, Apr. 2020, Peer-reviwed
International conference proceedings, English

Kerr-lens mode-locked Tm3+:RE2O3 (RE=Lu, Sc) lasers
Anna Suzuki; Masaki Tokurakawa; Christian Kränkel
ALPS2020, ALPS3-03, Apr. 2020, Peer-reviwed
International conference proceedings, English

High quality-factor Kerr-lens mode-locked Tm:Sc2O3 single crystal laser with anomalous spectral broadening
A. Suzuki; C. Kränkel; M. Tokurakawa
Applied Physics Express, 13, 052007, Apr. 2020, Peer-reviwed
Scientific journal, English

Investigation of Dy3+/Tm3+ co-doped ZrF4-BaF2-YF3-AlF3 fluoride glass for efficient 2.9 μm mid-infrared laser applications
H. Zhao; S. Jia; X. Wang; R. Wang; X.Lu; Y.Fan; M.Tokurakawa; G. Brambilla; S. Wang; P. Wang
Journal of Alloys and Compounds, 815, 152754, 23 Oct. 2019, Peer-reviwed
Scientific journal, English

A Tm3+-doped ZrF4-BaF2-YF3-AlF3 glass microsphere laser in the 2.0 μm wavelength region
H.Y.Zhao; A.Z.Li; Y.T.Yi; M.Tokurakawa; G.Brambilla; S.J.Jia; S.B.Wang; P.F.Wang
Journal of Luminescence, ELSEVIER, 212, 207-211, Aug. 2019, Peer-reviwed
Scientific journal, English

Nanosecond passively Q-switched fibre laser using a NiS2 based saturable absorber
Shi Li; Yu Yin; Qiuyun Ouyang; Guicang Ran; Yujin Chen; Elfed Lewis; Gerald Farrell; Masaki Tokurakawa; Sulaiman Wadi Harun; Pengfei Wang
Optics Express, OSA, 27, 19843-19851, 02 Jul. 2019, Peer-reviwed
Scientific journal, English

Dual-wavelength mode-locked erbium-doped fiber laser based on tin disulfide thin film as saturable absorber
Shi Li; Yu Yin; Guicang Ran; Qiuyun Ouyang; Yujin Chen; Masaki Tokurakawa; Elfed Lewis; Sulaiman Wadi Harun; Pengfei Wang
Journal of Applied Physics, 125, 243104, 26 Jun. 2019, Peer-reviwed
Scientific journal, English

All-normal-dispersion nonlinear polarization rotation mode-locked Tm:ZBLAN fiber laser
Masaki Tokurakawa; Hiromu Sagara; Henrik Tünnermann
Optics Express, OSA, 27, 19530-19535, 26 Jun. 2019, Peer-reviwed
Scientific journal, English

All-normal-dispersion mode-locked Tm:ZBLAN fiber laser
Hiromu Sagara; Masaki Tokurakawa
CLEO Europe, CJ1-3, 23 Jun. 2019, Peer-reviwed
International conference proceedings, English

High Quality-Factor Kerr-lens Mode-locked Tm:Sc2O3 Laser with anomalous spectral broadening
A. Suzuki; C. Krankel; M. Tokurakawa
ALPS2019, ALPS15, 05, 25 Apr. 2019, Peer-reviwed
International conference proceedings, English

Nonlinear polarization rotation dispersion managed soliton mode-locked laser using normal dispersion Tm silica fiber
Takumi Sato; Yuhao Chen; R. Sidharthan; Seongwoo Yoo; Masaki Tokurakawa
ALPS2019, ALPSP2, 05, 24 Apr. 2019, Peer-reviwed
International conference proceedings, English

Dissipative soliton generation in Er-doped fibre laser using SnS2 as saturable absorber
S. Li; Y. Yin; Q. Ouyang; Y. Chen; E. Lewis; G. Farrell; M. Tokurakawa; S. W. Harun; P. Wang
Applied Physics Express, 12, 102008, 2019, Peer-reviwed
Scientific journal, English

Two micron All-normal-dispersion NPR mode-locked Tm:ZBLAN fiber laser
H. Sagara; A. Suzuki; M. Tokurakawa
ASSL, ATu2A.25., 07 Nov. 2018, Peer-reviwed
International conference proceedings, English

2 μm帯超短パルス固体レーザーカーレンズモード同期Tm:Sc2O3レーザー
戸倉川正樹; 藤田慧祐; Christian Kränkel
光学「2017年 日本の光学研究」特集号, 日本光学会, 47, 7, Jun. 2018, Peer-reviwed, Invited
Scientific journal, Japanese

Off-peak Raman fiber laser at the wavelength of 1629 nm
Anna Suzuki; Eisuke Fujita; Masaki Tokurakawa
ALPS2018, ALPSp-23, 26 Apr. 2018, Peer-reviwed
International conference proceedings, English

Sub-120 fs Kerr-lens mode-locked Tm:Sc2O3 laser in-band pumped by an Er;Yb fiber MOPA
Masaki Tokurakawa; Eisuke Fujita; Christian Kränkel
Optics InfoBase Conference Papers, OSA - The Optical Society, 2018, 2018, Peer-reviwed, We demonstrate a Kerr-lens mode-locked Tm3+:Sc2O3 laser in-band pumped by a 1611 nm Er-fiber laser. 115 fs pulses with 42.6 nm spectral bandwidth are obtained. The output power and repetition rate are 420 mW and 95 MHz, respectively.
International conference proceedings, English

Kerr-lens mode-locked Tm3+:Sc2O3 single-crystal laser in-band pumped by an Er:Yb fiber MOPA at 1611 nm
Masaki Tokurakawa; Eisuke Fujita; Christian Kraenkel
OPTICS LETTERS, OPTICAL SOC AMER, 42, 16, 3185-3188, Aug. 2017, Peer-reviwed, We demonstrate a Kerr-lens mode-locked Tm3+:Sc2O3 single-crystal laser in-band pumped by an Er3+:Yb3+ fiber master oscillator power amplifier at 1611 nm. Pulses as short as 166 fs with an average output power of 440 mW are obtained. The spectral bandwidth and center wavelength are 29.3 and 2124 nm, respectively. At a longer pulse duration of 298 fs, we obtain 1 W of average output power. The repetition rate is 95 MHz, and the conversion efficiency against the absorbed pump power is as high as 47%. To the best of our knowledge, this is the first Kerr-lens modelocked Tm3+-doped solid state laser. (C) 2017 Optical Society of America
Scientific journal, English

8 W Narrow-Linewidth Linearly-Polarized 1610 nm Er:Yb All Fiber MOPA
Eisuke Fujita; Yutaka Mashiko; Masaki Tokurakawa
CLEO/Europe-EQEC 2017, CJ-P.20, 26 Jun. 2017, Peer-reviwed
International conference proceedings, English

Kerr-lens Mode-locked Tm3+:Sc2O3 Single Crystal Laser In-band Pumped by a 1611nm Er:Yb Fiber MOPA
Masaki Tokurakawa; Yutaka Mashiko; Eisuke Fujita; Christian Kränke
CLEO/Europe-EQEC 2017, CA-5.3, 25 Jun. 2017, Peer-reviwed
International conference proceedings, English

High power nonlinear polarization rotation soliton mode-locked Tm fiber laser with huge sideband spectral structure
Hiromu Sagara; Eisuke Fujita; Yutaka Mashiko; Masaki Tokurakawa
The 6th Advanced Lasers and Photon Sources (ALPS’17), ALPS14p-20, 20 Apr. 2017, Peer-reviwed
International conference proceedings, English

All fiberized mode-locked Tm fiber oscillator above 100 nJ pulse energy and amplifier above 10 W average power with ~6 μJ pulse energy
Yutaka Mashiko; Masaki Tokurakawa
The 6th Advanced Lasers and Photon Sources (ALPS’17), ALPS14-22, 20 Apr. 2017, Peer-reviwed
International conference proceedings, English

Sub 200 fs Kerr-lens Mode-locked Tm3+:Sc2O3 Laser In-band Pumped by a 1611nm Er:Yb Fiber MOPA
Masaki Tokurakawa; Yutaka Mashiko; Eisuke Fujita; Christian Kränkel
The 6th Advanced Lasers and Photon Sources (ALPS’17), ALPS4-8, 18 Apr. 2017, Peer-reviwed
International conference proceedings, English

Kerr-lens mode-locked Tm3+: Sc2O3 laser at 2.1μm wavelength range
Masaki Tokurakawa; Eisuke Fujita; Anna Suzuki; Christian Kränkel
Optics InfoBase Conference Papers, OSA - The Optical Society, 2017, 2017, Peer-reviwed, We demonstrate a Kerr-lens mode-locked Tm3+:Sc2O3 laser in-band pumped by a 1611 nm fiber laser. 166 fs pulses with 440 mW output power and 298 fs pulses with 1 W output power are obtained.
International conference proceedings, English

High power narrow-linewidth linearly-polarized 1610 nm Er:Yb all-fiber MOPA
Eisuke Fujita; Yutaka Mashiko; Seira Asaya; Mitsuru Musha; Masaki Tokurakawa
OPTICS EXPRESS, OPTICAL SOC AMER, 24, 23, 26255-26260, Nov. 2016, Peer-reviwed, We developed a narrow-linewidth linearly-polarized all-PM-fiber MOPA at the wavelength of 1610 nm. The MOPA consists of a DFB laser diode seed source and three amplifier stages with three different gain fibers. The first amplifier stage employed an Er doped fiber and the second and third amplifier stages employed Er: Yb co-doped fibers. The maximum output power was 8 W. Linewidth of 25 MHz and polarization extinction ratio of 28 dB was obtained. At the maximum output power, no ASE component around 1.55 mu m or 1 mu m was observed. (C) 2016 Optical Society of America
Scientific journal, English

Tunable noise-like pulse generation in mode-locked Tm fiber laser with a SESAM
Yutaka Mashiko; Eisuke Fujita; Masaki Tokurakawa
OPTICS EXPRESS, OPTICAL SOC AMER, 24, 23, 26515-26520, Nov. 2016, Peer-reviwed, We report on a tunable noise-like pulse (NLP) generation in a mode-locked Tm fiber laser with a SESAM. A tuning range of 1895-1942 nm, while keeping the spectral bandwidth of 10-19 nm under NLP mode-locked operation, was obtained by a tunable filter based on chromatic dispersion of telescope lenses. At the center wavelength of 1928 nm, the maximum output power of 195 mW with the spectral bandwidth of 18.9 nm was obtained. The repetition rate was 20.5 MHz and the corresponding pulse energy was 9.5 nJ. To our knowledge, this is the first report of a tunable NLP mode-locked laser based on chromatic dispersion of a lens system. (C) 2016 Optical Society of America
Scientific journal, English

High power narrow-linewidth linearly-polarized 1610 nm Er:Yb all-fiber MOPA
E. Fujita; Y. Mashiko; M. Tokurakawa
The 5th Advanced Lasers and Photon Sources Conference ALPS’16, ALPSp14-24, 19 May 2016, Peer-reviwed
International conference proceedings, English

Tunable SESAM mode-locked Tm fiber laser at the wavelength range of two micron
Yutaka Mashiko; Eisuke Fujita; Masaki Tokurakawa
The 5th Advanced Lasers and Photon Sources Conference ALPS’16, ALPS4-6, 17 May 2016, Peer-reviwed
International conference proceedings, English

Exploiting the short wavelength gain of silica-based thulium-doped fiber amplifiers
Z. Li; Y. Jung; J. M. O. Daniel; N. Simakov; M. Tokurakawa; P. C. Shardlow; D. Jain; J. K. Sahu; A. M. Heidt; W. A. Clarkson; S. U. Alam; D. J. Richardson
OPTICS LETTERS, OPTICAL SOC AMER, 41, 10, 2197-2200, May 2016, Peer-reviwed, Short wavelength operation (1650-1800 nm) of silica-based thulium-doped fiber amplifiers (TDFAs) is investigated. We report the first demonstration of in-band diode-pumped silica-based TDFAs working in the 1700-1800 nm waveband. Up to 29 dB of small-signal gain is achieved in this spectral region, with an operation wavelength accessible by diode pumping as short as 1710 nm. Further gain extension toward shorter wavelengths is realized in a fiber laser pumped configuration. A silica-based TDFA working in the 1650-1700 nm range with up to 29 dB small-signal gain and noise figure as low as 6.5 dB is presented.
Scientific journal, English

Tunable SESAM mode-locked Tm fiber laser based on chromatic dispersion of lens
Yutaka Mashiko; Eisuke Fujita; Masaki Tokurakawa
2016 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO), IEEE, STu3P.5., 2016, Peer-reviwed, We report tunable SESAM mode-locking of a Tm fiber laser facilitated by chromatic dispersion of a lens. A tuning range of 1890-1940 nm with the maximum average power of 196mW, spectral bandwidth of 18.9 nm, and the repetition rate of 20.5 MHz was obtained.
International conference proceedings, English

波長2μm帯Tm添加固体・ファイバーレーザー
戸倉川 正樹; 益子裕
光アライアンス, 日本工業出版㈱, 10, 10, 45-49, 2016, Peer-reviwed, Invited
Scientific journal, Japanese

Numerical analysis of fast saturable absorber mode-locked Yb3+ lasers under large modulation depth
Masaki Tokurakawa; Akira Shirakawa
OPTICS EXPRESS, OPTICAL SOC AMER, 23, 20, 26288-26298, Oct. 2015, Peer-reviwed, Numerical analysis of fast saturable absorber mode-locked Yb3+-doped solid state lasers is reported. The analysis includes a special case in which the spectral bandwidth of the short pulse is larger than the fluorescence bandwidth of the gain material. The relationship between the available shortest pulse duration and modulation depth for a standard bulk and thin disk laser geometries with several gain materials are shown. The characteristic phenomena observed in our previous Kerr-lens mode-locked laser experiments were reproduced in the simulation. (C) 2015 Optical Society of America
Scientific journal, English

Highly efficient Tm3+:Sc2O3 Laser in-band Pumped by a 1611.5 nm Er-Fiber Laser
M. Tokurakawa; Y. Mashiko; C. Kränkel
CLEO Europe 2015, CA-12.1 THU, Sep. 2015, Peer-reviwed
International conference proceedings, English

Ultra-short wavelength operation of a thulium fibre laser in the 1660-1750 nm wavelength band
J. M. O. Daniel; N. Simakov; M. Tokurakawa; M. Ibsen; W. A. Clarkson
OPTICS EXPRESS, OPTICAL SOC AMER, 23, 14, 18269-18276, Jul. 2015, Peer-reviwed, Ultra-short wavelength operation of a thulium fibre laser is investigated. Through use of core pumping and high feedback efficiency wavelength selection, a continuously-tunable fibre laser source operating from 1660 nm to 1720 nm is demonstrated in a silica host. We discuss the range of applications within this important wavelength band such as polymer materials processing and medical applications targeting characteristic C-H bond resonance peaks. As a demonstration of the power scalability of thulium fibre lasers in this band, fixed wavelength operation at 1726 nm with output power up 12.6 W and with slope efficiency >60% is also shown. (C) 2015 Optical Society of America
Scientific journal, English

High resolution Fourier domain Optical Coherence Tomography at 2 microns for painted objects
H. Liang; C. S. Cheung; J. M. O. Daniel; M. Tokurakawa; W. A. Clarkson; M. Spring
OPTICS FOR ARTS, ARCHITECTURE, AND ARCHAEOLOGY V, SPIE-INT SOC OPTICAL ENGINEERING, 9527, 2015, Peer-reviwed, Optical Coherence Tomography has been successfully applied to the non-invasive imaging of subsurface microstructure of a variety of materials from biological tissues to painted objects of art. One of the limitations of the technique is the low depth of penetration due to the strong scattering and absorption in the material. Previous studies found that for paint materials, the optimum window for large depth of penetration is around 2.2 microns. This is also true for many other materials with low water content. We have previously demonstrated OCT systems in this wavelength regime for imaging with improved depth of penetration. In this paper, we present an improved 2 micron high resolution Fourier domain OCT system using a broadband supercontinuum source. The system achieved a depth resolution of 9 microns in air (or 6 microns in paint or any polymer).
International conference proceedings, English

Ultra-broadband wavelength-swept Tm-doped fiber laser using wavelength-combined gain stages
M. Tokurakawa; J. M. O. Daniel; C. S. Chenug; H. Liang; W. A. Clarkson
OPTICS EXPRESS, OPTICAL SOC AMER, 23, 1, 471-476, Jan. 2015, Peer-reviwed, A wavelength-swept thulium-doped fiber laser system employing two parallel cavities with two different fiber gain stages is reported. The fiber gain stages were tailored to provide emission in complementary bands with external wavelength-dependent feedback cavities sharing a common rotating polygon mirror for wavelength scanning. The wavelength-swept laser outputs from the fiber gain elements were spectrally combined by means of a dichroic mirror and yielded over 500 mW of output with a scanning range from similar to 1740 nm to similar to 2070 nm for a scanning frequency of similar to 340 Hz. (C) 2015 Optical Society of America
Scientific journal, English

High resolution Fourier domain optical coherence tomography in the 2 μm wavelength range using a broadband supercontinuum source
C. S. Cheung; J. M; O. Daniel; M. Tokurakawa; W. A. Clarkson; H. Liang
Optics Express, 23, 1992-2001, Jan. 2015, Peer-reviwed
Scientific journal, English

Tm3+:KY(WO4)2 laser in-band pumped by a Tm fiber laser,” in Advanced Solid State Lasers
M. Tokurakawa; J. M; O. Daniel; W. A. Clarkson
ASSL 2014, ATu2A.30, 18 Nov. 2014, Peer-reviwed
International conference proceedings, English

Optical coherence tomography in the 2-mu m wavelength regime for paint and other high opacity materials
C. S. Cheung; J. M. O. Daniel; M. Tokurakawa; W. A. Clarkson; H. Liang
OPTICS LETTERS, OPTICAL SOC AMER, 39, 22, 6509-6512, Nov. 2014, Peer-reviwed, An optical coherence tomography system using a compact fiber source emitting amplified spontaneous emission at central wavelength of 1960 nm with bandwidth of 40 nm is developed to enhance the probing depth in a highly scattering material with low water content. Examples of application to paint are used to demonstrate significantly improved penetration depth in high opacity materials in the 2-mu m wavelength regime. (C) 2014 Optical Society of America.
Scientific journal, English

Wavelength-swept Tm-doped fiber laser operating in the two-micron wavelength band
M. Tokurakawa; J. M. O. Daniel; C. S. Chenug; H. Liang; W. A. Clarkson
OPTICS EXPRESS, OPTICAL SOC AMER, 22, 17, 20014-20019, Aug. 2014, Peer-reviwed, A wavelength-swept thulium-doped silica fiber laser using an intracavity rotating slotted-disk wavelength scanning filter in combination with an intracavity solid etalon for passive control of temporal and spectral profiles is reported. The laser yielded a wavelength swept output in a step-wise fashion with each laser pulse separated from the previous pulse by a frequency interval equal to the free-spectral-range of the etalon and with an instantaneous linewidth of <0.05 nm. Scanning ranges from 1905 nm to 2049 nm for a cladding-pumping laser configuration, and from 1768 nm to 1956 nm for a core-pumping laser configuration were achieved at average output powers up to similar to 1 W. (C)2014 Optical Society of America
Scientific journal, English

Wavelength-Swept Tm-doped Fiber Lasers
M. Tokurakawa; J. M. O. Daniel; C. S. Chenug; H. Liang; W. A. Clarkson
2014 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO), IEEE, STu1L.2, 2014, Peer-reviwed, Wavelength-swept operation of cladding-pumped and core-pumped thulium-doped fiber lasers using a novel intracavity rotating disk wavelength-scanning arrangement is reported. Scanning ranges from 1905-2049nm (for cladding pumping) and 1768-1956nm (for core pumping) were obtained.
International conference proceedings, English

Ultra-short wavelength operation of a two-micron thulium fiber laser
J. M. O. Daniel; N. Simakov; M. Tokurakawa; M. Ibsen; W. A. Clarkson
2014 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO), IEEE, SW1N.2, 2014, Peer-reviwed, The short wavelength limit of a thulium fiber laser is investigated. Wavelength tuning from 1720nm to 1660nm was demonstrated and fixed wavelength operation up to 12.6W at 1726nm with slope efficiency of 67% was achieved.
International conference proceedings, English

Wavelength-Swept Tm-doped Fiber Lasers
M. Tokurakawa; J. M. O. Daniel; C. S. Chenug; H. Liang; W. A. Clarkson
2014 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO), IEEE, 22, 20014-20019, 2014, Peer-reviwed, Wavelength-swept operation of cladding-pumped and core-pumped thulium-doped fiber lasers using a novel intracavity rotating disk wavelength-scanning arrangement is reported. Scanning ranges from 1905-2049nm (for cladding pumping) and 1768-1956nm (for core pumping) were obtained.
International conference proceedings, English

Ultra-broadband Wavelength Swept Tm-doped Fibre Laser
M. Tokurakawa; J. M; O. Daniel; C. S. Cheung; H. Liang; W. A. Clarkson
CLEO/Europe-IQEC 2013, CJ7.5, May 2013, Peer-reviwed
International conference proceedings, English

Long wavelength optical coherence tomography for painted objects
C. S. Cheung; M. Tokurakawa; J. M. O. Daniel; W. A. Clarkson; H. Liang
OPTICS FOR ARTS, ARCHITECTURE, AND ARCHAEOLOGY IV, SPIE-INT SOC OPTICAL ENGINEERING, 8790, 2013, Peer-reviwed, Optical Coherence Tomography has been successfully applied to the imaging of painted objects in recent years. However, a significant limitation is the low penetration depth of OCT in paint because of the high opacity of paint due to either scattering or absorption. It has been shown that the optimum spectral window for OCT imaging of paint layers is around 2.2 mu m in wavelength. In this paper, we demonstrate a 1950nm OCT for imaging painted objects using a superfluorescent fiber source at low power.
International conference proceedings, English

Power-scalable wavelength-agile fibre laser source at two-microns
J.M.O.Daniel; M. Tokurakawa; W.A.Clarkson
5th EPS-QEOD Europhoton Conference, 345730, Aug. 2012, Peer-reviwed
International conference proceedings, English

Continuous wave and mode-locked Yb3+:Y2O3 ceramic thin disk laser
Masaki Tokurakawa; Akira Shirakawa; Ken-ichi Ueda; Hideki Yagi; Takagimi Yanagitani; Alexander A. Kaminskii; Kolja Beil; Christian Kraenkel; Guenter Huber
OPTICS EXPRESS, OPTICAL SOC AMER, 20, 10, 10847-10852, May 2012, Peer-reviwed, CW and mode-locked laser operation based on an Yb3+:Y2O3 ceramic thin disk is reported. In CW laser operation, an output power of 70 W with an optical-to-optical efficiency of 57.4% was achieved. A higher slope efficiency of 70% was also obtained with a 50-W pump laser diode with more suitable emission characteristics. In mode-locked laser operation, pulses as short as 547 fs with an average power of 7.4 W were obtained. To our knowledge, this is the first demonstration of a high power CW and mode-locked laser operation based on Yb3+:Y2O3 ceramic thin disks. (C) 2012 Optical Society of America
Scientific journal, English

Continuous Wave and Mode-locked Yb3+:Y2O3 Ceramic Thin-disk Laser
M. Tokurakawa; A. Shirakawa; K. Ueda; H. Yagi; T. Yanagitani; K. Beil; C. Krankel; K. Petermann; G. Huber
in Advanced Solid-State Photonics 2012, AM2A.4., 10847-10853, 2012, Peer-reviwed
International conference proceedings, English

Systematic Study on Shortest Pulse Duration in Mode-locked Yb Lasers
M. Tokurakawa; A. Shirakawa; K. Ueda
in Advanced Solid-State Photonics 2012, AT4A.13, 2012, Peer-reviwed
International conference proceedings, English

Phase-locked multi-core photonic crystal fiber laser by end-sealing
Akira Shirakawa; Hidenori Yamada; Michio Matsumoto; Masaki Tokurakawa; Ken-ichi Ueda
SPIE Photonics West, 8237-2, 2012, Peer-reviwed
International conference proceedings, English

Ultrashort pulse generation from diode pumped mode-locked Yb3+:sesquioxide single crystal lasers
M. Tokurakawa; A. Shirakawa; K. Ueda; R. Peters; S. T. Fredrich-Thornton; K. Petermann; G. Huber
Optics Express, 19, 2904-2909, Oct. 2011, Peer-reviwed
Scientific journal, English

Q-switched multicore photonic crystal fiber laser phase-locked by end-seal technique
Akira Shirakawa; Hidenori Yamada; Michio Matsumoto; Masaki Tokurakawa; Ken-Ichi Ueda
2011 Int. Quantum Electron. Conf., IQEC 2011 and Conf. Lasers and Electro-Optics, CLEO Pacific Rim 2011 Incorporating the Australasian Conf. Optics, Lasers and Spectroscopy and the Australian Conf., 3240-CT-4, 359-360, 2011, Peer-reviwed, Q-switched and phase-locked Yb-doped multicore fiber laser is reported. The monolithic in-phase mode selection at the output fiber end realizes clean single-lobe beam profile and high slope efficiency of 62% with 280μJ, 100ns pulses. © 2011 IEEE.
International conference proceedings, English

Broadband-gain Nd3+-doped Ba(Zr, Mg, Ta)O3 ceramic lasers for ultrashort pulse generation
H. Kurokawa; A. Shirakawa; M. Tokurakawa; K. Ueda; S. Kuretake; N. Tanaka; Y. Kintaka; K. Kageyama; H. Takagi; A. A. Kaminskii
Optical Materials, Elsevier B.V., 33, 5, 667-669, 2011, Peer-reviwed, We report Nd3+-doped Ba(Zr, Mg, Ta)O3 ceramic lasers. The fluorescence of the ceramics shows characteristic broadband spectra due to the disordered crystalline system and can be tailored by the composition adjustment. The continuous-wave laser operations as well as the first mode-locked laser operation are presented. © 2010 Elsevier B.V. All rights reserved.
International conference proceedings, English

New oxide ceramics {YGd2}[Sc-2](Al2Ga)O-12 with a partially disordered "garnet" structure as a matrix for the Ln(3+) laser activator ions: Some physical properties
M. Sh. Akchurin; R. V. Gainutdinov; I. I. Kupenko; A. V. Taranov; E. N. Hazanov; H. Yagi; K. Ueda; A. Shirakawa; M. Tokurakawa; A. A. Kaminskii
DOKLADY PHYSICS, MAIK NAUKA/INTERPERIODICA/SPRINGER, 55, 11, 537-540, Nov. 2010, Peer-reviwed
Scientific journal, English

Continuous-wave and mode-locked lasers on the base of partially disordered crystalline Yb3+:{YGd2}[Sc2](Al2Ga)O12 ceramics
M. Tokurakawa; H. Kurokawa; Ae. Shirakawa; K. Ueda; H. Yagi; T. Yanagitani; A. A. Kaminskii
Optics Express, 18, 4390-4395, Feb. 2010, Peer-reviwed
Scientific journal, English

Estimation of Gain Bandwidth Limitation of Short Pulse Duration Based on Competition of Gain Saturation
M. Tokurakawa; A. Shirakawa; K. Ueda
in Advanced Solid-State Photonics, 2010, paper, AMB16, 2010, Peer-reviwed
International conference proceedings, English

Diode-pumped mode-locked Nd3+-doped Ba(Zr,Mg,Ta)O-3 ceramic laser
H. Kurokawa; M. Tokurakawa; A. Shirakawa; K. Ueda; A. A. Kaminskii; S. Kuretake; N. Tanaka; Y. Kintaka; K. Kageyama
2010 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) AND QUANTUM ELECTRONICS AND LASER SCIENCE CONFERENCE (QELS), IEEE, CMNN4., 2010, Peer-reviwed, Nd3+-doped Ba(Zr,Mg,Ta)O-3 ceramic laser is reported. The broadband fluorescence profile can be tailored by the "disordered" perovskite structure and is suitable for ultrashort pulse lasers. Mode-locked laser operation was demonstrated for the first time. (C) 2010 Optical Society of America
International conference proceedings, English

Stimulated-emission spectroscopy of fine-grained "garnet" ceramics Nd3+ :Y3Al5O12 in a wide temperature range between 77 and 650 K
A. A. Kaminskii; S. N. Bagaev; K. Ueda; A. Shirakawa; T. Tokurakawa; H. Yagi; T. Yanagitany; J. Dong
LASER PHYSICS LETTERS, IOP PUBLISHING LTD, 6, 9, 682-687, Sep. 2009, Peer-reviwed, Stimulated-emission spectroscopy methods were applied to investigate the temperature behaviour of main laser properties of the "garnet" ceramics Nd3+ :Y3Al5O12. Obtained results clearly show that this novel form of the garnet gain material is an excellent alternative to the Nd3+ :Y3Al5O12 single crystals.
Scientific journal, English

Nonlinear-laser χ(3)-effects in novel garnet-type fine-grained ceramic-host {YGd2}[Sc2](Al2Ga)O12 for Ln3+ lasantslasants
A.A. Kaminskii; S.N. Bagaev; K. Ueda; H. Yagi; H.J. Eichler; A. Shirakawa; M. Tokurrakawa; H. Rhee; K. Takaichi; T. Yanagitani
Laser Physics Letters, 6, 671-677, May 2009, Peer-reviwed
Scientific journal, English

Diode-pumped ultrashort-pulse generation based on Yb3+:Sc2O3 and Yb3+:Y2O3 ceramic multi-gain-media oscillator
M. Tokurakawa; A. Shirakawa; K. Ueda; H. Yagi; M. Noriyuki; T. Yanagitani; A. A. Kaminskii
Optics Express, 17, 3353-3361, Feb. 2009, Peer-reviwed
Scientific journal, English

Ba(Mg,Zr, Ta)O3:Nd3+ fine-grained ceramics: A novel laser-gain material with disordered structure for high-power laser systems
A. A. Kaminskii; H. Kurakawa; A. Shirakawa; K. Ueda; N. Tanaka; P. Becker; L. Bohatý; M. Akchurin; M. Tokurakawa; S. Kuretake; Y. Kintaka; K. Kageyama; H. Takagi
Laser Physics Letters, 6, 4, 304-310, 2009, Peer-reviwed, Nd3+-ion doped Ba(Mg,Zr,Ta)O3 ceramics is introduced as a new gain crystalline materials for lasers and laser amplifiers. By pumping laser-diode radiation at 300K its CW stimulated emission at 1.0754 μm wavelength was recorded. Some optical, spectroscopic and mechanical properties were measured as well. A graph is presented. © 2009 by Astro Ltd. Published exclusively by Wiley-VCH Verlag GmbH &
Co. KGaA.
Scientific journal, English

Ultra-Short Pulses from Diode-Pumped Yb3+-Doped Crystal and Ceramic Lasers with High Average Power
M. Tokurakawa; A. Shirakawa; K. Ueda; R. Peters; S. Fredrich-Thornton; K. Petermann; G. Huber; H. Yagi; T. Yanagitani; A. A. Kaminskii
in Advanced Solid-State Photonics, 2009., MC3, 2009, Peer-reviwed
International conference proceedings, English

Continuous-wave and mode-locked laser operations based on Yb3+:(YGd2)Sc-2(GaAl2)O-12 disordered ceramic
N. Tokurakawa; A. Shirakawa; K. Ueda; H. Yagi; T. Yanagitani; A. A. Kaminskii
2009 CONFERENCE ON LASERS AND ELECTRO-OPTICS AND QUANTUM ELECTRONICS AND LASER SCIENCE CONFERENCE (CLEO/QELS 2009), VOLS 1-5, IEEE, CFO3, 183-+, 2009, Peer-reviwed, Yb3+:(YGd2)Sc-2(GaAl2)O-12 disordered ceramic has been fabricated. 2.9-W average power with an optical-to-optical efficiency of 44% was achieved in a continuous-wave operation. 112-fs pulse duration with 860-mW average power was also achieved in a mode-locked operation. (C)2009 Optical Society of America
International conference proceedings, English

Nonlinear-laser chi((3))- and chi((2))-effects in fine-grained highly transparent optical Ba(Mg,Zr,Ta)O(3) ceramics and their microhardness
A. A. Kaminskii; M. Sh. Akchurin; N. Tanaka; H. J. Eichler; H. Rhee; K. Ueda; K. Takaichi; A. Shirakawa; M. Tokurakawa; J. Dong; Y. Kintaka; S. Kuretake; Y. Sakabe
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE, WILEY-BLACKWELL, 205, 7, 1666-1671, Jul. 2008, Peer-reviwed, We report on laser-induced chi((3))- and chi((2))-nonlinear generation in novel optical ceramics, Ba(Mg,Zr,Ta)O(3), with "disordered" O(h)(5)-cubic structure, namely high-order Stokes and anti-Stokes lasing, third- and second-harmonic generation under I one-micrometer picosecond pumping. Microhardness and fracture toughness were also measured.
Scientific journal, English

Nonlinear-laser effects in NH4H2PO4 (ADP) and ND4D2PO4 (DADP) single crystals: almost two-octave multi-wavelength Stokes and anti-Stokes combs, cascaded lasing in UV and visible ranges with the involving of the second and third harmonic generation
A. A. Kaminskii; V. V. Dolbinina; H. Rhee; H. J. Eichler; K. Ueda; K. Takaichi; A. Shirakawa; M. Tokurakawa; J. Dong; D. Jaque
LASER PHYSICS LETTERS, IOP PUBLISHING LTD, 5, 7, 532-542, Jul. 2008, Peer-reviwed, We report the experimental investigation of nonlinear cascaded lasing chi((3)) <-> chi((2)) effects in UV and visible ranges and high-order Stokes and anti-Stokes generation covering spectral space of about 18000 cm(-1) by stimulated Raman scattering and multi-wave mixing processes under one-micron picosecond pumping in the paraelectric state of NH4H2PO4 and ND4D2PO4 single crystals. All recorded Raman induced laser wavelengths are identified and attributed to their SRS-promoting vibration modes. Brief review of nonlinear-laser processes in non-centrosymmetric phosphates of KH2PO4-family and some physical properties of NH4H2PO4 and ND4D2PO4 are given as well.
Scientific journal, English

Diode-pumped 65 fs Kerr-lens mode-locked Yb3+: Lu2O3 and nondoped Y2O3 combined ceramic laser
Masaki Tokurakawa; Akira Shirakawa; Ken-ichi Ueda; Hideki Yagi; Syunsuke Hosokawa; Takagimi Yanagitani; Alexander A. Kaminskii
OPTICS LETTERS, OPTICAL SOC AMER, 33, 12, 1380-1382, Jun. 2008, Peer-reviwed, Diode-pumped Kerr-lens mode-locked laser operation of Yb3+: Lu2O3 and nondoped Y2O3 combined ceramics has been achieved; 65 fs pulses with an average power of 320 mW under 5 W of pump power were obtained at the center wavelength of 1032 nm. The spectral bandwidth and the time bandwidth product were 18.9 and 0.345 nm, respectively. To our knowledge, this is the first demonstration of a Kerr-lens mode-locked laser operation based on Yb3+: Lu2O3 ceramic. (c) 2008 Optical Society of America.
Scientific journal, English

Diode-pumped 65 fs Kerr-lens mode-locked Yb3+: Lu2O3 and nondoped Y2O3 combined ceramic laser
Masaki Tokurakawa; Akira Shirakawa; Ken-ichi Ueda; Hideki Yagi; Syunsuke Hosokawa; Takagimi Yanagitani; Alexander A. Kaminskii
OPTICS LETTERS, OPTICAL SOC AMER, 33, 12, 1380-1382, Jun. 2008, Peer-reviwed, Diode-pumped Kerr-lens mode-locked laser operation of Yb3+: Lu2O3 and nondoped Y2O3 combined ceramics has been achieved; 65 fs pulses with an average power of 320 mW under 5 W of pump power were obtained at the center wavelength of 1032 nm. The spectral bandwidth and the time bandwidth product were 18.9 and 0.345 nm, respectively. To our knowledge, this is the first demonstration of a Kerr-lens mode-locked laser operation based on Yb3+: Lu2O3 ceramic. (c) 2008 Optical Society of America.
Scientific journal, English

Diode-pumped 65 fs Kerr-lens mode-locked Yb3+: Lu2O3 and nondoped Y2O3 combined ceramic laser
Masaki Tokurakawa; Akira Shirakawa; Ken-ichi Ueda; Hideki Yagi; Syunsuke Hosokawa; Takagimi Yanagitani; Alexander A. Kaminskii
OPTICS LETTERS, OPTICAL SOC AMER, 33, 12, 1380-1382, Jun. 2008, Peer-reviwed, Diode-pumped Kerr-lens mode-locked laser operation of Yb3+: Lu2O3 and nondoped Y2O3 combined ceramics has been achieved; 65 fs pulses with an average power of 320 mW under 5 W of pump power were obtained at the center wavelength of 1032 nm. The spectral bandwidth and the time bandwidth product were 18.9 and 0.345 nm, respectively. To our knowledge, this is the first demonstration of a Kerr-lens mode-locked laser operation based on Yb3+: Lu2O3 ceramic. (c) 2008 Optical Society of America.
Scientific journal, English

Mechanical and optical properties of Lu2O3 host-ceramics for Ln(3+) lasants
A. A. Kaminskii; M. Sh. Akchurin; P. Becker; K. Ueda; L. Bohaty; A. Shirakawa; M. Tokurakawa; K. Takaichi; H. Yagi; J. Dong; T. Yanagitani
LASER PHYSICS LETTERS, IOP PUBLISHING LTD, 5, 4, 300-303, Apr. 2008, Peer-reviwed, Micro-hardness and fracture toughness, as well as linear optical properties (full transmission spectrum and refractive index dispersion) of fine-grained Lu2O3 ceramics fabricated by VSN method are presented.
Scientific journal, English

New nonlinear-laser effects in crystalline fine-grained ceramics based on cubic Sc2O3 and Lu2O3 oxides: second and third harmonic generation, and cascaded self-sum-frequency mixing in UV spectral region
A. A. Kaminskii; H. Rhee; H. J. Eichler; K. Ueda; K. Takaichi; A. Shirakawa; M. Tokurakawa; J. Dong; H. Yagi; T. Yanagitani
LASER PHYSICS LETTERS, IOP PUBLISHING LTD, 5, 2, 109-113, Feb. 2008, Peer-reviwed, We report on the first observation of the nonlinear cascading chi((3)) <-> chi((3)) effects in UV spectral range and second harmonic generation stipulated by the "defect" nonlinearity under one-micron pumping in crystalline ceramics based on cubic oxides Sc2O3 and Lu2O3. Broadband their multi-wavelength Stokes and anti-Stokes combs with the extension of 10475 cm(-1) (for Sc2O3) and 8232 cm(-1) (for Lu2O3) were recorded as well.
Scientific journal, English

Diode-pumped Kerr-lens mode-locked Yb-doped sesquioxide ceramic laser
M. Tokurakawa; A. Shirakawa; K. Ueda; H. Yagi; T. Yanagitani; A. Kaminskii
APLS 2008, Nagoya 2008, 31Bp4, 2008, Peer-reviwed
International conference proceedings, English

Diode-Pumped Kerr-Lens Mode-Locked Yb3+:Sc2O3and Yb3+:Y2O3Combined Active Media Ceramic Laser
M. Tokurakawa; H. Kurokawa; A. Shirakawa; K. Ueda; H. Yagi; T. Yanagitani; A. A. Kaminskii
in Advanced Solid-State Photonics, 2008, MG2, 2008, Peer-reviwed
International conference proceedings, English

Diode-pumped sub 60-fs Kerr-lens mode-locked Yb-doped sesquioxide combined ceramic laser
M. Tokurakawa; A. Shirakawa; K. Ueda; H. Yagi; T. Yanagitani; A. A. Kaminskii
2008 CONFERENCE ON LASERS AND ELECTRO-OPTICS & QUANTUM ELECTRONICS AND LASER SCIENCE CONFERENCE, VOLS 1-9, IEEE, 31Bp4, 200-+, 2008, Peer-reviwed, Diode-pumped Kerr-lens mode-locked laser operation of Yb3+:Sc2O3 and Yb3+:Y2O3 combined ceramics has been achieved. Sub-60 fs pulses with the average power of 380 mW were obtained at the center wavelength of 1042 nm. (C)2008 Optical Society of America
International conference proceedings, English

Diode-pumped sub 60-fs Kerr-lens mode-locked Yb-doped sesquioxide combined ceramic laser
M. Tokurakawa; A. Shirakawa; K. Ueda; H. Yagi; T. Yanagitani; A. A. Kaminskii
2008 CONFERENCE ON LASERS AND ELECTRO-OPTICS & QUANTUM ELECTRONICS AND LASER SCIENCE CONFERENCE, VOLS 1-9, IEEE, CFP6., 200-+, 2008, Peer-reviwed, Diode-pumped Kerr-lens mode-locked laser operation of Yb3+:Sc2O3 and Yb3+:Y2O3 combined ceramics has been achieved. Sub-60 fs pulses with the average power of 380 mW were obtained at the center wavelength of 1042 nm. (C)2008 Optical Society of America
International conference proceedings, English

Picosecond Raman induced Stokes and anti-Stokes lasing in fine-grained Ba(Sn,Zr,Mg,Ta)O-3 crystalline ceramics with the cubic perovskite structure
A. A. Kaminskii; N. Tanaka; H. J. Eichler; H. Rhee; K. Ueda; K. Takaichi; A. Shirakawa; M. Tokurakawa; Y. Kintaka; S. Kuretake; Y. Sakabe
LASER PHYSICS LETTERS, IOP PUBLISHING LTD, 4, 11, 819-823, Nov. 2007, Peer-reviwed, We report on the first observation of the Raman induced Stokes and anti-Stokes nonlinear chi((3)) -lasing in crystalline "cubic" Ba(Sn,Zr,Mg,Ta)O-3 ceramics of the E- and Z-types. We believe that these isotropic transparent oxide materials are also promising host-ceramics for lanthanide and transition-metal lasants.
Scientific journal, English

Diode-pumped sub-100 fs Kerr-lens mode-locked Yb3+:Sc2O3 ceramic laser
M. Tokurakawa; A. Shirakawa; K. Ueda; H. Yagi; T. Yanagitani; A.A. Kaminskii
Opt. Lett., 32, 3382-3384, Nov. 2007, Peer-reviwed
Scientific journal, English

Diode-pumped 188 fs mode-locked Yb3+: Y2O3 ceramic laser
Masaki Tokurakawa; Kazunori Takaichi; Akira Shirakawa; Ken-ichi Ueda; Hideki Yagi; Takagimi Yanagitani; Alexander A. Kaminskii
APPLIED PHYSICS LETTERS, AMER INST PHYSICS, 90, 7, 071101, Feb. 2007, Peer-reviwed, The authors have demonstrated a diode-pumped passively mode-locked Yb3+:Y2O3 ceramic laser by use of a semiconductor saturable absorber mirror. 188 fs pulses at a center wavelength of 1038 nm are obtained. The maximum output power is 220 mW at an absorbed pump power of 2.4 W with a diffraction-limited beam quality (M2 < 1.1). This is the shortest pulse generation from Yb-doped sesquioxide lasers and ceramic lasers ever reported. (c) 2007 American Institute of Physics.
Scientific journal, English

Diode-pumped mode-locked Yb3+: Lu2O3 ceramic laser
M. Tokurakawa; K. Takaichi; A. Shirakawa; K. Ueda; H. Yagi; S. Hosokawa; T. Yanagitani; A. A. Kaminskii
OPTICS EXPRESS, OPTICAL SOC AMER, 14, 26, 12832-12838, Dec. 2006, Peer-reviwed, We report a diode-pumped passively mode-locked Yb3+:Lu2O3 ceramic laser by use of a semiconductor saturable absorber mirror. Almost transform-limited 357 fs pulses at the center wavelength of 1033.5 nm with a maximum average power of 352 mW are obtained. The efficiency against the absorbed pump power is as high as 32% by use of a laser-diode pumping and the repetition rate is 97 MHz. This is the first demonstration of a diode-pumped mode-locked Yb3+:Lu2O3 ceramic laser to our knowledge. (C) 2006 Optical Society of America.
Scientific journal, English

Diode-pumped mode-locked ytterbium-doped sesquioxide ceramic lasers
A. Shirakawa; M. Tokurakawa; K. Takaichi; K. Ueda; H. Yagi; S. Hosokawa; T. Yanagitani
Laser Optics 2006, paper ., WeR1-42, Jun. 2006, Peer-reviwed
International conference proceedings, English

Diode-pumped mode-locked Yb-doped sesquioxide nanocrystalline ceramic lasers
M. Tokurakawa; A. Shirakawa; K. Ueda; H. Yagi; S. Hosokawa; T. Yanagitani; A. A. Kaminskii
OSA Annual Meeting-Frontier in Optics 2006, FMK3, 2006, Peer-reviwed
International conference proceedings, English

Ytterbium-doped tunable ceramic laser
Kazunori Takaichi; Masaki Tokurakawa; Akira Shirakawa; Ken-Ichi Ueda; Hideki Yagi; Shunsuke Hosokawa; Takagimi Yanagitani; Alexander A. Kaminskii
Conference on Lasers and Electro-Optics Europe - Technical Digest, CA-1-2, 2005, Peer-reviwed, Since 1998, it has been possible to fabricate highly transparent ceramics for solid-state lasers by a vacuum sintering technique and nanocrystalline technology. As a laser host, RE2O3 (RE = Y, Sc, and Lu), which is a C-type sesquioxide, has been a promising solid-state laser material because it has good thermal, chemical, optical, and mechanical properties. It is, however, difficult to make a RE2O3 single crystal because of to its high meting temperature (>
2400°C). Recently, Yb-doped lasers are very attractive because they have low quantum defect, and broad absorption and emission spectra [1]. We have been demonstrating several kinds of Yb-doped lasers with the highly transparent ceramics [2]. An LD-pumped tunable ceramic laser was demonstrated with an uncoated 5 at.%Yb3+:Y 2O3 ceramics. Schematic diagram of the laser experimental setup is shown in Fig. 1 (a). A 976-nm fiber coupled LD was used for zero-phone-line pumping, and the pumping beam was focused into the 5 at.%Yb 3+:Y2O3 ceramics with two lenses. An SF18 equilateral prism was used as a dispersive device, and the output coupler OC had T = 3% coating at 1030 nm. The experimental result is shown in Fig. 1 (b). We achieved the tunable ceramic laser in two regions, 1034-1050 and 1071-1078 nm wavelength, with pumping power of 3.9 W. The other kinds of Yb-doped tunable ceramic lasers will be reported. © 2005 IEEE.
International conference proceedings, English

Nonlinear-laser c(3)- and c(2)-effects in fine-grained highly transparent optical Ba(Mg,Zr,Ta)O3 ceramic and their microhardness
A. A. Kaminskii; M. Sh. Akchurin; N. Tanaka; H. J. Eichler; H. Rhee; K. Ueda; K. Takaichi; A. Shirakawa; M. Tokurakawa; J. Dong; Y. Kintaka; S. Kuretake; Y. Sakabe
Phys. Stat. Sol. (a), 205, 166-167, 2005, Peer-reviwed
Scientific journal, English

Laser and Spectroscopic Properties of Yb3+-doped Rare-Earth Sesquioxide Ceramics
K. Takaichi; H. Yagi; T. S. Petrov; M. Tokurakawa; A. Shirakawa; K. Ueda; S. Hosokawa; T. Yanagitani; J. Kawanaka; A. A. Kaminskii
in Advanced Solid-State Photonics, 2005, MB9, 2005, Peer-reviwed
International conference proceedings, English

波長 2µm 帯ナノ秒/フェムト秒光パルス発振器・増幅器の開発およびポリマー、シリコン材料加工応用
戸倉川正樹
18 Apr. 2022, 天田財団「FORM TECH REVIEW 2021」, 31, Japanese, Peer-reviwed, Invited, Introduction other

スペクトル広帯域化を伴うカーレンズモード同期Tm固体レーザー
戸倉川正樹; 鈴木杏奈; Kraenkel Christian
レーザー学会, Jul. 2021, レーザー研究, 49, 7, 385-390, Japanese, Peer-reviwed, Invited, Introduction scientific journal

波長2 µm帯希土類(Tm)添加固体・ファイバーレーザー
戸倉川正樹; 鈴木杏奈
2021, 光学, 50, 10, Japanese, Peer-reviwed, Invited, Introduction scientific journal

波長2μm帯ナノ秒、フェムト秒短パルスTmレーザー光源の開発
戸倉川 正樹
31 Mar. 2020, 天田財団「FORM TECH REVIEW 2019」, 29, 105-110, Japanese, Peer-reviwed, Invited, Introduction commerce magazine

波長2 um 帯広帯域高速波長掃引Tm ファイバーレーザー
戸倉川正樹; Jae M; O. Daniel; W. Andrew; Clarkson
日本光学会, Mar. 2016, 光学, 45, 3, 108-110, Japanese, Peer-reviwed, Invited, Introduction scientific journal, 0389-6625, 40020774995, AN00080324

GHz 領域の高繰り返し直線型短尺Cr:ZnS 超短パルスレーザーの開発
昆野愛夕; 戸倉川正樹
レーザー学会東京支部研究会
12 Mar. 2024

ミトコンドリアの観察に向けた可視域広視野フォトサーマル顕微鏡の開発
丸山朋希; 戸倉川正樹
レーザー学会東京支部研究会
12 Mar. 2024

SESAM とNALM を併用した全偏波保持Figure-9 Tm ファイバーレーザーの開発
平山 貴之; 戸倉川正樹
レーザー学会東京支部研究会
12 Mar. 2024

ミトコンドリアの観測に向けた可視域フォトサーマル顕微鏡の開発
丸山 朋希; 戸倉川 正樹
レーザー学会第44回年次大会
18 Jan. 2024

Cr:ZnS超短パルスレーザーの高繰り返し化に向けた共振器設計
昆野 愛夕; 戸倉川 正樹
レーザー学会第44回年次大会
18 Jan. 2024

SESAMとNALMを用いた全偏波保持Figure-9 Tmファイバーレーザーの開発
平山 貴之; 戸倉川 正樹
レーザー学会第44回年次大会
18 Jan. 2024

60 W LD励起Tmファイバーレーザーの波長可変特性
高貫 広翔; 戸倉川 正樹
レーザー学会第44回年次大会
18 Jan. 2024

Tm3+:YScO3混晶とTm3+:Lu2O3/Tm3+:Sc2O3複合利得媒質モード同期レーザーの比較
鈴木 杏奈; カルスニアク サシャ; ガンショウ ステフェン; クランケル クリスティアン; 戸倉川 正樹
レーザー学会第44回年次大会
18 Jan. 2024

Tmファイバーレーザーの温度依存性の評価
高貫 広翔; 戸倉川 正樹
Oral presentation, 第70回応用物理学会春季学術講演会15p-A305-4
15 Mar. 2023

波長2 µmに対するYb3+:Sc2O3の二光子吸収係数の測定
三井 崚平; 鈴木 杏奈; 戸倉川 正樹
Oral presentation, 第70回応用物理学会春季学術講演会15p-A305-3
15 Mar. 2023

Tm添加YScO3結晶の分光及びレーザー特性
鈴木 杏奈; Kalusniak Sascha; 田中 裕樹; Ganschow Steffen; Kränkel Christian; 戸倉川 正樹
Oral presentation, 第70回応用物理学会春季学術講演会15p-A305-2
15 Mar. 2023

Tm ファイバーレーザーの温度依存性評価及びASE 光源の作成
高貫 広翔; 戸倉川 正樹
Poster presentation, 第 22 回レーザー学会東京支部研究会
03 Mar. 2023

波長2 μm帯での二光子誘導放出観測に向けたモード同期レーザーの開 発
三井 崚平; 鈴木 杏奈; Christian Kränkel; 戸倉川 正樹
Poster presentation, 第２２回レーザー学会東京支部研究会
03 Mar. 2023

Tm:YLF レーザー励起Cr:ZnSe レーザーの開発
多田 涼太郎; 戸倉川 正樹
Poster presentation, 第２２回レーザー学会東京支部研究会
03 Mar. 2023

複合利得媒質および混晶利得媒質を用いた波長2 µm帯モード同期レーザーの超短パルス化
鈴木 杏奈; カルスニアク サシャ; 田中 裕樹; ガンショウ ステフェン; クレンケル クリスティアン; 戸倉川 正樹
Oral presentation, レーザー学会 学術講演会 第43回年次大会 B10/ 20p
20 Jan. 2023

二光子誘導放出の観測にむけたTm3+:Lu2O3/Yb3+:Sc2O3レーザーの開発
三井 崚平; 鈴木 杏奈; Christian Kränkel; 戸倉川 正樹
Oral presentation, レーザー学会 学術講演会 第43回年次大会 B03/ 18p
18 Jan. 2023

二光子誘導放出の観測にむけたTm3+:Lu2O3 / Yb3+:Sc2O3 モード同期レーザー
三井 崚平; 鈴木 杏奈; Christian Kränkel; 戸倉川 正樹
Oral presentation, Japanese, 第83回応用物理学会秋季学術講, Domestic conference
22 Sep. 2022

Czochralski法によるTm添加混晶sesquioxide結晶の育成 及び特性評価
鈴木 杏奈; K. Sascha; 田中 裕樹; B. Mario; G. Steffen; 戸倉川 正樹; K. Christian
Oral presentation, Japanese, 第83回応用物理学会秋季学術講
22 Sep. 2022

ブリルアン散乱フィードバックを利用した波長2 μm帯数ナノ秒QスイッチTmファイバーレーザー
矢津田 匠海; 戸倉川 正樹
Oral presentation, Japanese, 第83回応用物理学会秋季学術講
22 Sep. 2022

波長2 μm帯ナノ秒Tmファイバーレーザの開発と加工応用
矢津田 匠海; 戸倉川 正樹
Oral presentation, Japanese, 第83回応用物理学会秋季学術講
22 Sep. 2022

波長 2 μm 帯短パルス Tm レーザ光源の開発と加工応用
戸倉川 正樹; 鈴木 杏奈; 矢津田 匠海
Invited oral presentation, Japanese, レーザー加工学会, Invited, Domestic conference
16 May 2022

Tm添加sesquioxide媒質を⽤いた波⻑2 µm帯モード同期レーザの超短パルス化
鈴木 杏奈; Kränkel Christian; 戸倉川 正樹
Invited oral presentation, Japanese, 第69回応用物理学会春季学術講演会, Domestic conference
Mar. 2022

Cr2+:ZnSe/Sを用いた中赤外広帯域光源の開発
三井 崚平; 鈴木 杏奈; 湯本 正樹; 戸倉川 正樹
Oral presentation, Japanese, レーザー学会 学術講演会 第42回年次大会, Domestic conference
13 Jan. 2022

Tm添加sesquioxide媒質を用いたカーレンズモード同期レーザー
鈴木 杏奈; Kränkel Christian; 戸倉川 正樹
Oral presentation, Japanese, 第82回応用物理学会秋季学術講演会
11 Sep. 2021

Cr2+:ZnS/ZnSeを用いた中赤外レーザーの開発
三井 崚平; 鈴木 杏奈; 湯本 正樹; 戸倉川 正樹
Oral presentation, Japanese, 第82回応用物理学会秋季学術講演会
11 Sep. 2021

Tm:RE2O3(RE=Lu, Sc)複合利得媒質を用いたカーレンズモード同期レーザーによる サブ 9 サイクルパルス 発生
鈴木 杏奈; Christian Kränkel; 戸倉川 正樹
Oral presentation, Japanese, 2021年第68回応用物理学会春季学術講演会, Domestic conference
19 Mar. 2021

波長2 µm帯正常分散Tm ファイバーを用いたモード同期レーザーの開発
内園 裕也; 佐藤 匠; Chen Yuhao; Sidharthan Raghuraman、Woo Seong Yo; 戸倉川 正樹
Oral presentation, Japanese, 2021年第68回応用物理学会春季学術講演会, Domestic conference
16 Mar. 2021

波長2µm帯ナノ-フェムト秒パルスTmレーザーの開発
戸倉川 正樹; 鈴木 杏奈; 佐藤 匠; 内園 裕也; 菊地 音; 矢津田 匠海; Kraenkel Christian
Invited oral presentation, Japanese, レーザー学会 第41回年次大会 シンポジウム最新レーザー応用への高度新型レーザー光源, Invited, Domestic conference
20 Jan. 2021

波長1650 nmLD励起Tm:Lu2O3セラミックレーザーの開発
菊地音; 鈴木杏奈; 戸倉川正樹
Oral presentation, Japanese, レーザー学会 第41回年次大会
20 Jan. 2021

nsパルスQスイッチTmファイバーレーザー
矢津田匠; 原田有生; 戸倉川正樹
Poster presentation, Japanese, レーザー学会 第41回年次大会
19 Jan. 2021

Tm添加媒質を用いた複合利得発振器
鈴木 杏奈; Kränkel Christian; 戸倉川 正樹
Oral presentation, Japanese, レーザー学会 第41回年次大会
19 Jan. 2021

Tm添加分散設計シリカファイバーを用いたストレッチパルスモード同期レーザーの開発
佐藤 匠; Yuhao Chen、Raghuraman Sidharthan; Seong Yoo; 戸倉川 正樹
Oral presentation, Japanese, レーザー学会 第41回年次大会
19 Jan. 2021

Tm媒質を用いた2μm帯モード同期レーザー ～次世代中赤外レーザーの開発～
戸倉川 正樹
Invited oral presentation, Japanese, 第5回超高速光エレクトロニクス研究会“次世代分野開拓のための光源開発とその応用”, Domestic conference
11 Dec. 2020

分散設計Tm添加シリカファイバーを用いた0分散近傍での非線形偏波回転モード同期レーザーの開発
佐藤 匠; Yuhao Chen; R. Sidharthan; Seongwoo Yoo; 戸倉川 正樹
Poster presentation, Japanese, 第5回超高速光エレクトロニクス研究会
11 Dec. 2020

Tm添加複合利得媒質を用いたカーレンズモード同期レーザー
鈴木杏奈; Christian Keankel; 戸倉川 正樹
Poster presentation, Japanese, 第5回超高速光エレクトロニクス研究会
11 Dec. 2020

分散制御Tm添加シリカファイバーを用いた0分散近傍での非線形偏波回転モード同期レーザーの開発
佐藤 匠; Yuhao Chen; R. Sidharthan; Seongwoo Yoo; 戸倉川 正樹
Poster presentation, Japanese, レーザー学会ファイバーレーザー技術専門委員会 公開研究会
27 Nov. 2020

非線形散乱フィードバックを用いたサブ100 µJナノ秒Tmファイバーレーザー
矢津田 匠海; 原田有生; 戸倉川 正樹
Poster presentation, Japanese, レーザー学会ファイバーレーザー技術専門委員会
27 Nov. 2020

カーレンズモード同期Tm3+:Lu2O3セラミックレーザーの開発
鈴木 杏奈; 戸倉川 正樹
Oral presentation, Japanese, 第67回応用物理学会春季学術講演会, Domestic conference
12 Mar. 2020

AOMを用いたQスイッチTmファイバーレーザ
戸倉川 正樹; 原田 有生
Oral presentation, Japanese, 第67回応用物理学会春季学術講演会, Domestic conference
12 Mar. 2020

波長1650 nm LD励起Tm固体レーザーの開発
菊地音; 鈴木杏奈; 戸倉川 正樹
Poster presentation, Japanese, 第20回レーザー学会東京支部研究会
09 Mar. 2020

共振内スペクトル広帯域化を伴うモード同期 Tm:Sc2O3 laser レーザー
鈴木杏奈; Christian Keankel; 戸倉川 正樹
Oral presentation, Japanese, 2019年第80回応用物理学会 秋季学術講演会, Domestic conference
19 Sep. 2019

分散補償鏡を用いたカーレンズモード同期Tm:Sc2O3レーザーの開発
鈴木杏奈; Christian Keankel; 戸倉川 正樹
Oral presentation, Japanese, 2019年第66回応用物理学会 春季学術講演会, Domestic conference
10 Mar. 2019

回折格子対による全正常分散モード同期ZBLANファイバーレーザーのパルス圧縮特性
相楽 啓; 戸倉川 正樹
Oral presentation, Japanese, 2019年第66回応用物理学会 春季学術講演会, Domestic conference
10 Mar. 2019

High Quality factor Tm:Sc2O3カーレンズモード同期レーザーの開発
鈴木杏奈; Christian Keankel; 戸倉川 正樹
Poster presentation, Japanese, 第19回レーザー学会東京支部研究会/電気学会 光・量子デバイス技術研究会
08 Mar. 2019

W型屈折率分布分散制御Tmシリカファイバーを用いた モード同期レーザーの開発
佐藤 匠; Yuhao Chen; R. Sidharthan; Seongwoo Yoo; 戸倉川 正樹
Poster presentation, Japanese, 第19回レーザー学会東京支部研究会/電気学会 光・量子デバイス技術研究会, Domestic conference
08 Mar. 2019

波長2μm帯超短パルスTm添加固体レーザーの開発
戸倉川 正樹; 鈴木 杏奈; クリスティアン クランケル
Invited oral presentation, Japanese, レーザー学会第39回年次大会, Invited, レーザー学会, 東海大学, Domestic conference
13 Jan. 2019

全正常分散Tm:ZBLANモード同期ファイバーレーザー
Hiromu Sagara; Anna Suzuki; Masaki Tokurakawa
Poster presentation, Japanese, レーザー学会第39回年次大会, Domestic conference
Jan. 2019

波長2μm帯中赤外短パルスTmレーザーの開発
戸倉川 正樹; 相楽 啓; 鈴木 杏奈; 原田 有生
Invited oral presentation, Japanese, 第９回横幹連合コンファレンス, Domestic conference
06 Oct. 2018

全正常分散Tm:ZBLAN モード同期ファイバーレーザー
相楽 啓; 鈴木杏奈; 戸倉川 正樹
Oral presentation, Japanese, 第79回応用物理学会秋季学術講演会, Domestic conference
18 Sep. 2018

波長1629 nmラマンファイバーレーザー励起によるTm:Lu2O3レーザーの開発
鈴木杏奈; 戸倉川正樹
Oral presentation, Japanese, 第79回応用物理学会秋季学術講演会, Domestic conference
Sep. 2018

Development of short pulse Tm doped lasers at 2 μm wavelength range in ILS, UEC
Masaki Tokurakawa
Public discourse, English, Invited, Harbin University. Harbin China
Jul. 2018

Sub-120fs Kerr-lens mode-locked Tm:Sc2O3 laser at 2.1 μm wavelength range
M. Tokurakawa
Invited oral presentation, English, 18th International Conference on Laser Optics, Invited, St.Petersburg, Russia, International conference
05 Jun. 2018

1611nmファイバーレーザ励起カーレンズモード同期Tm:Sc2O3レーザーの開発
藤田 慧祐; 鈴木 杏奈; 戸倉川 正樹
Poster presentation, Japanese, 第18回レーザー学会東京支部研究会/電気学会 光・量子デバイス技術研究会, Domestic conference
02 Mar. 2018

Tm:Lu2O3レーザー励起用波長1629 nmラマンファイバーレーザーの開発
鈴木杏奈; 戸倉川正樹
Poster presentation, Japanese, 第18回レーザー学会東京支部研究会/電気学会 光・量子デバイス技術研究会, Domestic conference
02 Mar. 2018

高効率・高出力な波長2μm帯超短パルスTmレーザーの研究
Invited oral presentation, Japanese, 最先端の光の創成を目指したネットワーク研究拠点プログラムシンポジウム, Invited, Domestic conference
23 Jan. 2018

パネルディスカッション グローバルリーダを育む光科学
Nominated symposium, Japanese, 最先端の光の創成を目指したネットワーク研究拠点プログラムシンポジウム
23 Jan. 2018

Tm添加ファイバーパルス光源の開発
相楽 啓; 原田有生; 戸倉川 正樹
Poster presentation, Japanese, 光拠点シンポジウム, Domestic conference
23 Jan. 2018

サブ120 fs Tm3+:Sc2O3レーザーの開発
藤田 慧祐; 鈴木杏奈; 戸倉川 正樹
Poster presentation, Japanese, 光拠点シンポジウム, Domestic conference
23 Jan. 2018

波長2μm帯Tm添加固体・ ファイバーレーザーの開発 In band 励起を用いたカーレンズモード同期 Tm3+:Sc2O3レーザーの開発
Invited oral presentation, Japanese, 電子・情報・システム部門 光・量子デバイス技術委員会/研究会奨励賞 記念講演会, Invited, 電気学会, Domestic conference
29 Sep. 2017

中赤外(~2 μm)レーザー光源の開発と研究動向
戸倉川 正樹
Public discourse, Japanese, レーザー協会 第178回研究会
24 May 2017

全ファイバー型2 μm 帯Tm ファイバーノイズライクパルス発振器 及び増幅器の開発
益子裕; 藤田慧祐; 戸倉川正樹
Oral presentation, Japanese, 第64回応用物理学会春季学術講演会, Domestic conference
15 Mar. 2017

非線形偏波回転を用いたTmファイバーモード同期レーザーの開発
相楽 啓; 藤田 慧祐; 戸倉川 正樹
Oral presentation, Japanese, 第64回応用物理学会春季学術講演会, Domestic conference
15 Mar. 2017

サブ200 fsカーレンズモード同期Tm3+:Sc2O3レーザー
戸倉川 正樹; 藤田 慧祐; 益子 裕; クランケル クリスティアン
Oral presentation, Japanese, 第64回応用物理学会春季学術講演会, Domestic conference
15 Mar. 2017

波長1610 nm･狭線幅･単一偏光･Er:Yb全ファイバーMOPAの開発
藤田慧祐; 益子裕; 戸倉川正樹
Oral presentation, Japanese, 第37回レーザー学会年次大会, Domestic conference
09 Jan. 2017

Tmファイバーを用いた波長2um帯パルスレーザーの増幅器の開発
益子裕; 藤田慧祐; 戸倉川正樹
Oral presentation, Japanese, 第37回レーザー学会年次大会, Domestic conference
09 Jan. 2017

In band 励起を用いたモード同期Tm3+:Sc2O3レーザーの開発
戸倉川正樹; 益子裕; 藤田慧祐; クリスティアン クランケル
Oral presentation, Japanese, 第37回レーザー学会年次大会, Domestic conference
07 Jan. 2017

波長1610nm狭線幅単一偏光Er:Yb全ファイバーMOPAの開発
藤田慧祐; 戸倉川正樹
Oral presentation, Japanese, 第63回応用物理学会春季学術講演会
20 Mar. 2016

半導体可飽和吸収体鏡を用いた波長可変モード同期Tm ファイバーレーザーの開発
益子 裕; 藤田 慧祐; 戸倉川 正樹
Oral presentation, Japanese, 第63回応用物理学会春季学術講演会
20 Mar. 2016

波長2μm帯Tm添加固体・ファイバーレーザーの開発
戸倉川 正樹; 益子 裕; 藤田 慧祐
Invited oral presentation, Japanese, 光・量子デバイス研究会、高機能光源と産業応用への展開、電気学会・レーザー学会共催, Domestic conference
04 Mar. 2016

収差を用いた波長可変モード同期Tmファイバーレーザーの開発
益子裕; 藤田慧祐; 戸倉川正樹
Poster presentation, Japanese, 光・量子デバイス研究会、高機能光源と産業応用への展開、電気学会・レーザー学会共催
04 Mar. 2016

波長1610 nm狭線幅単一偏光Er:Yb全ファイバーMOPAの開発
藤田 慧祐; 戸倉川 正樹
Poster presentation, Japanese, 光・量子デバイス研究会、高機能光源と産業応用への展開、電気学会・レーザー学会共催
04 Mar. 2016

Ceramic Laser, promising candidate for next generation of solid state laser
M. Tokurakawa; A Shirakawa; Ken-ichi Ueda
Invited oral presentation, English, IUMRS-ICAM2015, Invited, International conference
Oct. 2015

1611.5 nm Er fiber 励起を用いた高効率Tm3+:Sc2O3 レーザー
戸倉川; 正樹; C. Krankel
Oral presentation, Japanese, 第76回応用物理学会秋季学術講演会, Domestic conference
14 Sep. 2015

半導体可飽和吸収体鏡を用いたノイズライクソリトンモード同期Tm ファイバーレーザーの開発
益子裕; 戸倉川正樹
Oral presentation, Japanese, 第76回応用物理学会秋季学術講演会, Domestic conference
13 Sep. 2015

2μmの固体・ファイバーレーザーの開発
戸倉川正樹
Invited oral presentation, Japanese, 電気学会委員会, 電気学会, Domestic conference
12 Jun. 2015

Development of mode-locked Tm doped fiber and solid state lasers at the wavelength range of 2 μm in ILS
Masaki Tokurakawa
Oral presentation, English, Second MIPT-UEC Joint Workshop on Optical Science, International conference
20 Oct. 2014

Tmファイバーレーザー励起 Tm:KY(WO4)2 レーザー
戸倉川 正樹; J. M; O. Daniel; W. A. Clarkson
Oral presentation, Japanese, 2014年秋季第75回応用物理学会, Domestic conference
16 Sep. 2014

超広帯域波長掃引Tm添加ファイバーレーザー
戸倉川正樹
Others, Japanese, 先端光量子科学アライアンスセミナー
Nov. 2013

超広帯域波長掃引Tm添加ファイバーレーザー
戸倉川正樹
Others, Japanese, 先端光量子科学アライアンスセミナー
Nov. 2013

位相同期マルチコアフォトニック結晶ファイバーレーザーのQスイッチ動作
山田英典; 戸倉川正樹; 白川晃; 植田憲一
Oral presentation, Japanese, 第8回ナノ未来材料とコヒーレント光科学合同シンポジウム
Dec. 2011

Continuous wave and mode-locked laser based on Yb3+:Y2O3 ceramic thin-disk
M. Tokurakawa; A. Shirakawa; K. Ueda; H. Yagi; T. Yanagitani; K. Beil; C. Kraunkel; K. Petermann; G. Huber
Invited oral presentation, English, 7rd Laser Ceramic Symposium 2011, Singapore, International conference
Nov. 2011

Qスイッチ位相同期マルチコアフォトニック結晶ファイバーレーザー
山田英典; 松本道生; 戸倉川正樹; 白川晃; 植田憲一
Oral presentation, Japanese, 第72回応用物理学会学術講演会
Aug. 2011

高出力Yb3+:Y2O3 セラミック 薄型ディスクレーザーの開発
戸倉川正樹; 白川晃; 植田憲一; 八木秀喜; 柳谷高公; K. Beil; C. Krankel; K. Petermann; G. Huber
Oral presentation, Japanese, 2011年秋季第72回応用物理学会
Aug. 2011

NdドープBa(Mg,Zr,Ta)O3セラミックレーザーの研究
呉竹悟志; 田中伸彦; 金高祐二; 景山恵介; 黒川裕章; 戸倉川正樹; 白川晃; 植田憲一; A. Kaminskii
Oral presentation, Japanese, レーザー学会学術講演会第31回年次大会
Jan. 2011

Nd3+-doped Ba(Zr4+,Mg2+,Ta5+)O3 ceramics as laser materials
S. Kuretake; N. Tanaka; Y. Kintaka; K. Kageyama; H. Takagi; H. Nakao; M. Tokurakawa; A. Shirakawa; K. Ueda; A. A. Kaminskii
Invited oral presentation, English, 6th Laser Ceramics Symposium, Munster, Germany, International conference
Dec. 2010

Yb3+添加薄型ディスク媒質を用いたカーレンズモード同期レーザーの開発
戸倉川正樹; 白川晃; 植田憲一
Oral presentation, Japanese, 第71回応用物理学会学術講演会
Sep. 2010

Yb添加媒質を用いたカーレンズモード同期レーザーの開発
戸倉川正樹
Public symposium, Japanese, 日本学術会議シンポジウム「先端フォトニクスの展望」
Apr. 2010

超短パルスNd3+:Ba(Zr,Mg,Ta)O3セラミックレーザーの研究
黒川裕章; 戸倉川正樹; 白川晃; 植田憲一; A. Kaminskii; 田中伸彦; 金高祐二; 呉竹悟志; 景山恵介
Oral presentation, Japanese, 日本光学会年次学術講演会Optics & Photonics Japan 2009
Nov. 2009

カーレンズモード同期Yb添加希土類三二酸化物レーザー
戸倉川正樹; 黒川裕章; 白川晃; 植田憲一; 八木秀喜; 柳谷高公; Alexander A. Kaminskii
Oral presentation, Japanese, 平成21年春季第70回応用物理学会学術講演会, 富山
Sep. 2009

Yb3+:(YGd2)Sc2(GaAl2)O12セラミックレーザー
戸倉川正樹; 黒川裕章; 白川晃; 植田憲一; 八木秀喜; 柳谷高公; Alexander A. Kaminskii
Oral presentation, Japanese, 平成21年秋季第56回応用物理学会学術講演会
Apr. 2009

Ultra-Short-Pulse Generation from Diode-Pumped Yb3+-Doped Ceramic Laser with High Average Power
戸倉川正樹
Public symposium, English, John L. Hall forum, Tokyo
Mar. 2009

広帯域利得Nd添加Ba(Mg,Zr,Ta)O3セラミックレーザー
黒川裕章; 戸倉川正樹; 白川晃; 植田憲一; A. Kaminskii; 田中伸彦; 金高祐二; 呉竹悟志; 景山恵介; 鷹木洋
Oral presentation, Japanese, 第29回レーザー学会年次大会,徳島大学，
Jan. 2009

Femtosecond Diode-Pumped Yb-Doped Crystal and Ceramic Lasers with High Average Power
M. Tokurakawa; A. Shirakawa; K. Ueda; R. Peters; S.Fredrich-Thornton; K. Petermann; G. Huber; H. Yagi; T. Yanagitani; A.A. Kaminskii
Invited oral presentation, English, International laser physics workshop, Spain, Barcelona, International conference
2009

Ultrashort Pulses from Diode-Pumped Yb3+-Doped Ceramic Lasers
M. Tokurakawa; A. Shirakawa; K. Ueda; H. Yagi; T. Yanagitani; A.A. Kaminiskii
Invited oral presentation, English, 5th Laser Ceramic Symposium 2009, Bilbao Spain, International conference
2009

Broadband-gain Nd3+-doped Ba(Zr,Mg,Ta)O3 ceramic lasers for ultrashort pulse generation
A. Shirakawa; H. Kurokawa; M. Tokurakawa; K. Ueda; N. Tanaka; Y. Kintaka; S. Kuretake; K. Kageyama; H. Takagi; A. A. Kaminskii
Invited oral presentation, English, 5th Laser Ceramic Symposium 2009, Bilbao Spain, International conference
2009

Rare-earth doped transparent Ba(Zr,Mg,Ta)O3 ceramics for lasers
N. Tanaka; S. Kuretake; Y. Kintaka; K. Kageyama; H. Takagi; K. Ueda; A. Shirakawa; M. Tokurakawa; H. Kurokawa; A. A. Kaminskii
Invited oral presentation, English, 6th China International Conference on High-Performance Ceramics, China, International conference
2009

MgOセラミックスの熱誘起複屈折
黒川裕章; 戸倉川正樹; 白川晃; 植田憲一; 鎌倉高広; 八木秀喜; 柳谷高公
Oral presentation, Japanese, 第69回応用物理学会学術講演会，中部大学(春日井)，
Sep. 2008

カーレンズモード同期Ｙｂ添加複合利得媒質セラミックレーザー
戸倉川正樹; 白川晃; 植田憲一; 八木秀喜; 柳谷高公; Alexander A. Kaminskii
Invited oral presentation, Japanese, 平成20年春季第69回応用物理学会学術講演会, 講演奨励賞 受賞記念講演, Domestic conference
Sep. 2008

MgOセラミックスの熱誘起複屈折
黒川裕章; 戸倉川正樹; 白川晃; 植田憲一; 鎌倉高広; 八木秀喜; 柳谷高公
Oral presentation, Japanese, 第８回レーザー学会東京支部研究会,慶應義塾大学，
Mar. 2008

カーレンズモード同期Ｙｂ添加複合利得媒質セラミックレーザー
戸倉川正樹; 白川晃; 植田憲一; 八木秀喜; 柳谷高公; Alexander A. Kaminskii
Oral presentation, Japanese, 平成20年春季第55回応用物理学会学術講演会, 千葉
Mar. 2008

カーレンズモード同期 Yb3+:Lu2O3:Y2O3複合セラミックレーザー
戸倉川正樹; 白川晃; 植田憲一; 八木秀喜; 柳谷高公; Alexander A. Kaminskii
Oral presentation, Japanese, レーザー学会学術講演会第28回年次大会,名古屋
Feb. 2008

高出力超短パルスセラミックレーザー光源
戸倉川正樹; 白川晃; 植田憲一; 八木秀喜; 柳谷高公; Alexander A. Kaminskii
Invited oral presentation, Japanese, 平成１９年度 日本光学会名古屋講演会「最近の高出力レーザーの開発状況と産業応用」, 名古屋, Domestic conference
Jan. 2008

Rare-earth doped disordered transparent Ba(Zr,Mg,Ta)O3 ceramics
N. Tanaka; S. Kuretake; Y. Kintaka; K. Kageyama; H. Takagi; K. Ueda; A. Shirakawa; M. Tokurakawa; H. Kurokawa; A. A. Kaminskii
Invited oral presentation, English, 4th Laser Ceramic Symposium 2008, International conference
2008

波長可変Yb3+ :Y2O3セラミックレーザー
戸倉川正樹; 白川晃; 植田憲一; 八木秀喜; 柳谷高公; Alexander A. Kaminskii
Oral presentation, Japanese, 平成19年秋季第68回応用物理学会学術講演会, 北海道
Sep. 2007

Diode-pumped Kerr-lens mode-locked Yb3+:sesquioxide ceramic lasers
M. Tokurakawa; A. Shirakawa; K. Ueda; H. Yagi; T. Yanagitani; A. A. Kaminskii
Invited oral presentation, English, COE International symposium December 2007, Tokyo Japan, International conference
2007

LD励起Yb3+添加希土類酸化物セラミックモード同期レーザー
戸倉川正樹; 高市和則; 八木秀喜; 白川晃; 植田憲一; 細川俊介; 柳谷高公; Alexander A.Kaminskii
Oral presentation, Japanese, 2006年春季第53回応用物理学関係連合講演会, 東京
Mar. 2006

Yb3+添加希土類酸化物セラミックモード同期レーザー
戸倉川正樹; 高市和則; 八木秀喜; 白川晃; 植田憲一; 細川俊介; 柳谷高公; Alexander A.Kaminskii
Oral presentation, Japanese, 第6回レーザー学会東京支部研究会／電気学会光量子デバイス研究会
Mar. 2006

Yb3+添加希土類酸化物セラミックモード同期レーザー
戸倉川正樹; 高市和則; 八木秀喜; 白川晃; 植田憲一; 細川俊介; 柳谷高公; Alexander A.Kaminskii
Oral presentation, Japanese, レーザー学会学術講演会第26回年次大会, 大宮
Feb. 2006

Mode-locking performance of Yb-doped sesquioxide nanocrystalline ceramic lasers
A. Shirakawa; M. Tokurakawa; K. Takaichi; K. Ueda; H. Yagi; S. Hosokawa; T. Yanagitani; A. A. Kaminskii
Invited oral presentation, English, 2th Laser Ceramic Symposium, Tokyo Japan, International conference
2006

Yb-doped laser ceramics and the laser oscillations
K. Takaichi; H. Yagi; M. Tokurakawa; A. Shirakawa; K. Ueda; S. Hosokawa; T. Yanagitani; A. A. Kaminskii
Invited oral presentation, English, The 1st International Laser Ceramic Symposium (2005 E-MRS Fall Meeting, Warsaw, Russia, International conference
Sep. 2005

イッテルビウム添加Lu2O3セラミックレーザー
戸倉川正樹; 高市和則; 八木秀喜; 白川晃; 植田憲一; 細川俊介; 柳谷高公; Alexander A.Kaminskii
Oral presentation, Japanese, 2005年春季第52回応用物理学関係連合講演会, 埼玉、
Mar. 2005

イッテルビウム添加Lu2O3セラミックレーザー
戸倉川正樹; 高市和則; 八木秀喜; 白川晃; 植田憲一; 細川俊介; 柳谷高公; Alexander A.Kaminskii
Oral presentation, Japanese, 2005年春季第52回応用物理学関係連合講演会, 埼玉、
Mar. 2005

基盤理工学専攻基礎
The University of Electro-Communications

基盤理工学専攻基礎
電気通信大学

電子工学・光工学・物理工学 実験第1
The University of Electro-Communications

電子工学・光工学・物理工学 実験第1
電気通信大学

光学実験第二
The University of Electro-Communications

光学実験第二
電気通信大学

理工学基礎実験
The University of Electro-Communications

光エレクトロニクス実験第二
The University of Electro-Communications

光エレクトロニクス実験第二
電気通信大学

理工学基礎実験
The University of Electro-Communications

理工学基礎実験
電気通信大学

電気電子回路実験
The University of Electro-Communications

電気電子回路実験
電気通信大学

応用数学A
The University of Electro-Communications

電気・電子回路実験
The University of Electro-Communications

応用数学A
The University of Electro-Communications

応用数学A
電気通信大学

電気・電子回路実験
The University of Electro-Communications

電気・電子回路実験
電気通信大学

応用物理学会

レーザー学会

Optical Society of America

レーザー協会

超高輝度ファイバーレーザー励起中赤外チャープパルス増幅システムの探索
2024年度 基盤研究(B)（一般）, Principal investigator
Apr. 2024 - Mar. 2027

高ビーム品質な励起光特性を利用した波長2.1 µm帯ホロニウム添加ps fs短パルス加工光源
公益財団法人 天田財団, 電気通信大学レーザー新世代研究センター, Principal investigator
Oct. 2023 - Mar. 2026

社会実装を目的とした小型安価で使い易い中赤外デュアルコム光源の開発
公益財団法人JKA, 2024M-385
Apr. 2024 - Mar. 2025

フェムト秒発振器内での2光子誘導放出の観測
松尾学術振興財団
Nov. 2022 - Mar. 2024

波長2μm帯レーザー加工用、高エネルギー超短パルスTmファイバー発振器の開発
Apr. 2019 - Mar. 2022

波長2μm帯ナノ秒/フェムト秒光パルス増幅器の開発および加工応用
天田財団
31 Oct. 2017 - 31 Mar. 2020

In-band励起を用いた高性能2μm帯短パルスTm添加固体レーザー光源の研究
Tokurakawa Masaki
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, The University of Electro-Communications, Grant-in-Aid for Young Scientists (B), We have developed a high power highly efficient Kerr-lens mode-locked Tm doped sesquioxides laser in-band pumped by 1610 nm high power fiber laser. To our knowledge, this is the first report of the Kerr-lens mode-locked solid state laser at the wavelength range of 2μm. The pulses as short as 115 fs and the average power as high as 1 W were achieved. Comparison with prior mode-locked 2 μm solid state laser works, it has the third shortest pulse duration and an order higher average power., 16K17526
Apr. 2016 - Mar. 2018

高効率・高出力2μm帯パルスレーザー光源の開発
公益財団法人 天田財団, レーザプロセッシング 一般研究開発助成
2014 - 31 Mar. 2017

イッテルビウム添加媒質を用いた高出力・高エネルギー超短パルス光源及び増幅器の開発
戸倉川 正樹
日本学術振興会, 科学研究費助成事業, 電気通信大学, 特別研究員奨励費, Principal investigator, JSPS特別研究員奨励費, 09J08368
Apr. 2009 - Mar. 2010