Dr. Shinji Motokoshi Profile

Dr. Shinji Motokoshi

at Institute for Laser Technology

SPIE Involvement:

Author

Publications (38)

Proceedings Article | 13 March 2024 Presentation

Presentation

High power conduction-cooled active-mirror laser

Junji Kawanaka, Jumpei Ogino, Koji Tsubakimoto, Hidetsugu Yoshida, Shinji Motokoshi, Noboru Morio, Keiko Matsumoto, Kana Fujioka, Shigeki Tokita, Noriaki Miyanaga, Ken-ichi Ueda, Ryousuke Kodama, Akifumi Yogo

Proceedings Volume PC12864, PC128640B (2024) https://doi.org/10.1117/12.3005462

KEYWORDS: Laser crystals, High power lasers, Radiotherapy, Pulsed laser operation, Laser therapeutics, Laser energy, Heatsinks, Disk lasers, Cryogenics, Wavefront distortions

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Proceedings Article | 11 September 2020 Presentation

Presentation

Pulse width dependence of laser-induced damage thresholds on silica glasses by soft X-ray lasers

Katsuhiro Mikami, Masahiko Ishino, Thanh-Hung Dinh, Shinji Motokoshi, Noboru Hasegawa, Akira Kon, Yuichi Inubushi, Shigeki Owada, Hiroo Kinoshita, Masaharu Nishikino

Proceedings Volume 11514, 115141E (2020) https://doi.org/10.1117/12.2570991

KEYWORDS: Silica, Glasses, X-ray lasers, Laser induced damage, X-rays, Laser damage threshold, Femtosecond phenomena, Dielectrics, High power lasers, Laser systems engineering

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Proceedings Article | 7 March 2019 Paper

Paper

Zero-phonon line pumped Yb:YAG TRAM laser oscillator with direct jet impingement cooling

Seiji Taniguchi, Haik Chosrowjan, Dazhi Li, Shinji Motokoshi, Yasukazu Izawa, Shingo Nishikata, Tomoya Morioka, Koichi Hamamoto, Hiroshi Ikebuchi, Yuichi Ohtani, Takeshi Kaneko, Hiroyuki Daigo, Masayuki Fujita

Proceedings Volume 10896, 108961Z (2019) https://doi.org/10.1117/12.2511118

KEYWORDS: Cooling systems, Oscillators, Continuous wave operation, High power lasers, Laser development

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Proceedings Article | 26 November 2018 Presentation

Presentation

Development of adaptively mixed thin film (AMTF) deposited by a dielectric material and a plastic (Conference Presentation)

Kunio Yoshida, Takayuki Okamoto, Takuya Mikami, Hidetsugu Yoshida, Junji Kawanaka, Noriaki Miyanaga, Shinji Motokoshi, Takahisa Jitsuno

Proceedings Volume 10805, 1080513 (2018) https://doi.org/10.1117/12.2500273

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Proceedings Article | 13 January 2017 Paper

Paper

Ablation-erosion analyses of various fusion material surfaces and developments of surface erosion monitors for notification of fusion chamber maintenance times, as an example: Visible light transparent SiC and up-conversion phosphors applied to plasma facing surface structures, useful for versatile purposes to protect and diagnose fusion chambers and so on

K. Tokunaga, J. Schmidt, O. Frolov, J. Straus, J. Matejicek, K. Kasuya, S. Motokoshi, S. Taniguchi, M. Nakai, K. Kolacek, A. Choukourov

Proceedings Volume 10254, 102541B (2017) https://doi.org/10.1117/12.2256562

KEYWORDS: Silicon carbide, Tungsten, Diagnostics, Sensors, Diamond, Pulsed laser operation, Visible radiation, Plasma, Thin film coatings, Extreme ultraviolet

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Proceedings Article | 9 August 2016 Paper

Paper

Source of contamination in damage-test sample and vacuum

T. Jitsuno, H. Murakami, S. Motokoshi, T. Mikami, T. Kawasaki, N. Miyanaga, J. Kawanaka, K. Mikami

Proceedings Volume 9983, 998316 (2016) https://doi.org/10.1117/12.2239547

KEYWORDS: Contamination, Coating, Laser induced damage, Laser damage threshold, Mirrors, Optical components, Polishing, Surface finishing, High power lasers, Ultraviolet radiation, Optical coatings, Laser systems engineering, Humidity, Dielectrics, Pulsed laser operation

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Proceedings Article | 22 July 2016 Paper

Paper

Ion-assisted coating for large-scale Bimorph deformable mirror

Takahisa Jitsuno, Shinji Motokoshi, Takuya Mikami, Takayuki Okamoto, Kunio Yoshida, Vadim Samarkin, Alexis Kudryashov, Junji Kawanaka, Noriaki Miyanaga

Proceedings Volume 9983, 99830B (2016) https://doi.org/10.1117/12.2239479

KEYWORDS: Coating, Actuators, Mirrors, Deformable mirrors, Laser systems engineering, Polishing, Laser damage threshold, Laser induced damage, Deformable mirrors, Laser induced damage, Laser damage threshold, Surface finishing, Interferometers

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Proceedings Article | 3 February 2015 Paper

Paper

Laser erosion diagnostics of plasma facing materials with displacement sensors and their application to safeguard monitors to protect nuclear fusion chambers

Barbara Korczyc, Koichi Kasuya, Shinji Motokoshi, Waldemar Mroz, Boguslaw Budner, Mitsuo Nakai, Kazutoshi Tokunaga, Seiji Taniguchi

Proceedings Volume 9255, 925548 (2015) https://doi.org/10.1117/12.2065233

KEYWORDS: Sensors, Silicon carbide, Tungsten, Diamond, Plasma, Diagnostics, Laser safety, Chemical vapor deposition, Pulsed laser operation, Coating

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Proceedings Article | 31 October 2014 Paper

Paper

Detection of the laser-damage onset in optical coatings by the photothermal-deflection method

Katsuhiro Mikami, Semyon Papernov, Shinji Motokoshi, Stephen Jacobs, Takahisa Jitsuno

Proceedings Volume 9237, 923721 (2014) https://doi.org/10.1117/12.2068234

KEYWORDS: Absorption, Laser induced damage, Excitons, Contamination, Pulsed laser operation, Laser irradiation, Damage detection, Silica, Color centers, Laser optics

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Proceedings Article | 22 September 2014 Paper

Paper

Progress in research on laser damage mechanisms and contamination problem

T. Jitsuno, H. Murakami, K. Kato, E. Sato, K. Mikami, S. Motokoshi, N. Miyanaga, H. Azechi

Proceedings Volume 9238, 923802 (2014) https://doi.org/10.1117/12.2073663

KEYWORDS: Contamination, Optical coatings, Laser induced damage, Laser systems engineering, Dielectrics, Nitrogen, Pulsed laser operation, Silica, Temperature metrology, Mirrors

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Proceedings Article | 22 September 2014 Paper

Paper

Investigation of electric field formed in a multilayer mirror under simultaneous irradiation of two wavelengths

Muneo Sugiura, Koichi Tamura, Mitsunobu Kobiyama, Shinji Motokoshi, Takahisa Jitsuno

Proceedings Volume 9238, 923804 (2014) https://doi.org/10.1117/12.2073638

KEYWORDS: Mirrors, Multilayers, High power lasers, Reflectivity, Laser induced damage, Laser damage threshold, Solids, Cobalt, Laser applications, Laser systems engineering

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Proceedings Article | 14 November 2013 Paper

Paper

A theoretical analysis for temperature dependences of laser-induced damage threshold

K. Mikami, S. Motokoshi, T. Somekawa, T. Jitsuno, M. Fujita, K. Tanaka

Proceedings Volume 8885, 88851T (2013) https://doi.org/10.1117/12.2030180

KEYWORDS: Picosecond phenomena, Laser induced damage, Silica, Optical coatings, Temperature metrology, Laser damage threshold, Ionization, Pulsed laser operation, Laser applications, Nonlinear dynamics

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Proceedings Article | 19 July 2013 Paper

Paper

Recent progresses on insights of laser damage mechanisms and influence of contamination in optics

H. Azechi, K. Kato, E. Sato, K. Mikami, S. Motokoshi, N. Miyanaga, T. Jitsuno, H. Murakami

Proceedings Volume 8786, 87860B (2013) https://doi.org/10.1117/12.2021026

KEYWORDS: Contamination, Laser induced damage, Dielectrics, Optical coatings, Laser systems engineering, Pulsed laser operation, Mirrors, Temperature metrology, Optical components, Laser applications

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Proceedings Article | 19 July 2013 Paper

Paper

Laser-induced damage thresholds at different temperature for optical devices

Katsuhiro Mikami, Shinji Motokoshi, Toshihiro Somekawa, Takahisa Jitsuno, Masayuki Fujita, Kazuo Tanaka

Proceedings Volume 8786, 87861J (2013) https://doi.org/10.1117/12.2019870

KEYWORDS: Laser induced damage, Laser damage threshold, Picosecond phenomena, Silica, Pulsed laser operation, Glasses, Refractive index, Ionization, Temperature metrology, Laser systems engineering

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Proceedings Article | 30 January 2013 Paper

Paper

Comparisons of various surface erosions with a variety of laser lights and the applications

Waldemar Mroz, Boguslaw Budner, Shinji Motokoshi, Katsuhiro Mikami, Takayoshi Norimatsu, Koichi Kasuya

Proceedings Volume 8677, 867719 (2013) https://doi.org/10.1117/12.2010548

KEYWORDS: Sensors, Diamond, Head, Laser applications, Chemical vapor deposition, Nd:YAG lasers, Photography, Microscopes, Inspection, Diagnostics

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Proceedings Article | 4 December 2012 Paper

Paper

Temperature dependence of laser-induced damage thresholds by short pulse laser

Toshihiro Somekawa, Kazuo Tanaka, Masayuki Fujita, Katsuhiro Mikami, Shinji Motokoshi, Takahisa Jitsuno

Proceedings Volume 8530, 853005 (2012) https://doi.org/10.1117/12.976275

KEYWORDS: Laser induced damage, Laser damage threshold, Pulsed laser operation, Picosecond phenomena, Silica, Glasses, Dielectrics, Temperature metrology, Nd:YAG lasers, Coating

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Proceedings Article | 4 December 2012 Paper

Paper

Influences of oil-contamination on LIDT and optical properties in dielectric coatings

H. Murakami, S. Motokoshi, Y. Nakata, T. Jitsuno, T. Kawasaki, H. Azechi, H. Shiraga, K. Kato, N. Miyanaga, E. Sato, N. Sarukura, K. Mikami, T. Shinizu

Proceedings Volume 8530, 853024 (2012) https://doi.org/10.1117/12.977705

KEYWORDS: Contamination, Optical coatings, Mirrors, Dielectrics, Nitrogen, Optical properties, Dielectric mirrors, Laser induced damage, Silica, Metals

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Proceedings Article | 23 November 2011 Paper

Paper

Temperature dependences of fluorescence characteristic for Nd/Cr:YAG materials

Yoshiyuki Honda, Masahiro Nakatsuka, Minoru Yoshida, Takahisa Jitsuno, Shinji Motokoshi, Kana Fujioka

Proceedings Volume 8190, 819014 (2011) https://doi.org/10.1117/12.899047

KEYWORDS: Luminescence, Absorption, Ceramics, Energy transfer, Chromium, Ions, Ultraviolet radiation, Transmittance, Nd:YAG lasers, YAG lasers

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Proceedings Article | 23 November 2011 Paper

Paper

Laser-induced damage thresholds of optical coatings at different temperature

K. Mikami, S. Motokoshi, M. Fujita, T. Jitsuno, K. Tanaka

Proceedings Volume 8190, 81900A (2011) https://doi.org/10.1117/12.899033

KEYWORDS: Laser damage threshold, Silica, Dielectrics, Laser induced damage, Glasses, Optical coatings, Metals, Magnesium fluoride, Plasma, Temperature metrology

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Proceedings Article | 23 November 2011 Paper

Paper

Database on damage thresholds of picoseconds pulse for HR coatings

Kota Kato, Takahisa Jitsuno, Katsuhiro Mikami, Tomohiro Somekawa, Eiji Sato, Shinji Motokoshi

Proceedings Volume 8190, 81900I (2011) https://doi.org/10.1117/12.899275

KEYWORDS: Laser damage threshold, Picosecond phenomena, Optical coatings, Databases, Pulsed laser operation, Laser applications, Laser systems engineering, Laser induced damage, Laser development, Laser optics

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Proceedings Article | 6 December 2010 Paper

Paper

Oil-contamination problem in large-scale pulse-compressor

T. Shinizu, N. Sarukura, S. Motokoshi, K. Kato, H. Azechi, T. Jitsuno, Y. Nakata, E. Saato, H. Shiraga, K. Mikami, N. Miyanaga, T. Kawasaki, H. Murakami

Proceedings Volume 7842, 784221 (2010) https://doi.org/10.1117/12.867528

KEYWORDS: Contamination, Silica, Mirrors, Optical components, Laser damage threshold, Optical coatings, Pulsed laser operation, Laser applications, Laser induced damage, Photography

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Proceedings Article | 2 December 2010 Paper

Paper

Database on laser-induced damage thresholds for AR and HR coatings in Japan

Katsuhiro Mikami, Shinji Motokoshi, Kota Kato

Proceedings Volume 7842, 78420F (2010) https://doi.org/10.1117/12.867235

KEYWORDS: Databases, Laser damage threshold, Optical coatings, Laser induced damage, Antireflective coatings, Laser optics, Silica, Autoregressive models, Laser systems engineering, Laser applications

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Proceedings Article | 29 November 2010 Paper

Paper

Temperature dependence of nonlinear optical phenomena in silica glasses

M. Murakami, K. Mikami, M. Fujita, T. Jitsuno, S. Motokoshi

Proceedings Volume 7842, 78420X (2010) https://doi.org/10.1117/12.867240

KEYWORDS: Refractive index, Silica, Glasses, Temperature metrology, Laser damage threshold, Laser induced damage, Acoustics, Transmittance, Laser scattering, Nd:YAG lasers

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Proceedings Article | 31 December 2009 Paper

Paper

Laser-induced damage thresholds in silica glasses at different temperature

S. Motokoshi, J. Kawanaka, T. Jitsuno, R. Yasuhara, K. Mikami, M. Fujita

Proceedings Volume 7504, 75041R (2009) https://doi.org/10.1117/12.836350

KEYWORDS: Silica, Laser induced damage, Laser damage threshold, Glasses, Temperature metrology, Nd:YAG lasers, Laser systems engineering, Laser engineering, Cryogenics, High power lasers

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Proceedings Article | 23 February 2006 Paper

Paper

Development of thermally controlled HALNA DPSSL for inertial fusion energy

Osamu Matsumoto, Takashi Kurita, Yasukazu Izawa, Tadashi Ikegawa, Takashi Sekine, Junji Kawanaka, Noriaki Miyanaga, Masahiro Nakatsuka, Takayoshi Norimatsu, Ryo Yasuhara, Hirofumi Kan, Masahiro Miyamoto, Hiroyuki Furukawa, Shinji Motokoshi, Toshiyuki Kawashima

Proceedings Volume 6101, 61011Q (2006) https://doi.org/10.1117/12.645644

KEYWORDS: Glasses, Cladding, Laser glasses, Thermal effects, Laser systems engineering, Fusion energy, Amplifiers, Pulsed laser operation, Absorption, High power lasers

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Proceedings Article | 21 February 2005 Paper

Paper

Enhancement of surface damage resistance by selective chemical removal of CeO₂

Haruya Shiba, Tomosumi Kamimura, Takahisa Jitsuno, Hideo Horibe, Shigenori Akamatsu, Shinji Motokoshi, Kunio Yoshida, Takayasu Sakamoto, Takayuki Okamoto

Proceedings Volume 5647, (2005) https://doi.org/10.1117/12.585219

KEYWORDS: Surface finishing, Laser induced damage, Polishing, Laser damage threshold, Silica, Resistance, Contamination, Laser applications, Cerium, Surface roughness

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Proceedings Article | 10 June 2004 Paper

Paper

Enhancement of surface-damage resistance by removing subsurface damage in fused silica

Ichiro Yamato, Haruya Shiba, Tomosumi Kamimura, Shigenori Akamatsu, Masashi Yamamoto, Shinji Motokoshi, Takahisa Jitsuno, Kunio Yoshida, Takayuki Okamoto, Takayasu Sakamoto

Proceedings Volume 5273, (2004) https://doi.org/10.1117/12.524961

KEYWORDS: Surface finishing, Polishing, Silica, Etching, Ion beams, Resistance, Laser damage threshold, Wet etching, Laser induced damage, Surface roughness

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Proceedings Article | 12 April 2001 Paper

Paper

Optical thin films grown by surface chemical reaction for high-power lasers

Shin-ichi Zaitsu, Shinji Motokoshi, Tatsuhiko Yamanaka, Takahisa Jitsuno, Masahiro Nakatsuka

Proceedings Volume 4347, (2001) https://doi.org/10.1117/12.425045

KEYWORDS: Laser induced damage, Chemical reactions, Laser damage threshold, Molecules, Thin films, Coating, Thin film growth, High power lasers, Resistance, Crystals

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Proceedings Article | 3 April 2000 Paper

Paper

Gray-tracking susceptibility in KTiOPO4 crystals

Masahiro Nakatsuka, Yasukazu Izawa, Takahisa Jitsuno, Shinji Motokoshi

Proceedings Volume 3889, (2000) https://doi.org/10.1117/12.380944

KEYWORDS: Crystals, Absorption, Annealing, Transmittance, Ferroelectric materials, Nonlinear crystals, Nd:YAG lasers, Contamination, Laser crystals, Process control

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Proceedings Article | 3 April 2000 Paper

Paper

Optical thin films grown by surface chemical reaction for high-power lasers

Tatsuhiko Yamanaka, Shin-ichi Zaitsu, Shinji Motokoshi, Takahisa Jitsuno, Masahiro Nakatsuka

Proceedings Volume 3889, (2000) https://doi.org/10.1117/12.380929

KEYWORDS: Laser damage threshold, Laser induced damage, Chemical reactions, Thin films, Thin film growth, High power lasers, Molecules, Refractive index, Crystals, Signal detection

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Proceedings Article | 3 March 2000 Paper

Paper

Evaluation of KTiOPO4 crystals for high-power laser

Yasukazu Izawa, Masahiro Nakatsuka, Takahisa Jitsuno, Shinji Motokoshi

Proceedings Volume 3902, (2000) https://doi.org/10.1117/12.379302

KEYWORDS: Crystals, Absorption, Ferroelectric materials, Laser crystals, Annealing, Nonlinear crystals, Transmittance, Nd:YAG lasers, High power lasers, Harmonic generation

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Proceedings Article | 1 February 2000 Paper

Paper

F2 laser ablation process of silica glass

Takahisa Jitsuno, Hironari Mikata, Shinji Motokoshi, Masahiro Nakatsuka, Keiu Tokumura

Proceedings Volume 3885, (2000) https://doi.org/10.1117/12.376989

KEYWORDS: Silica, Glasses, Absorption, Laser ablation, Laser processing, Pulsed laser operation, Excimer lasers, Transmittance, Neodymium, Surface roughness

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Proceedings Article | 11 January 2000 Paper

Paper

Multiwedge array for uniform target irradiation

Noriaki Nishi, Shinji Motokoshi, Masahiro Nakatsuka, Masaru Iwasaki, Takahisa Jitsuno

Proceedings Volume 3886, (2000) https://doi.org/10.1117/12.375134

KEYWORDS: Modulation, Diffraction, Plasma, Spherical lenses, Transmittance, Beam shaping, Laser welding, Laser systems engineering, Laser irradiation, Beam controllers

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Proceedings Article | 23 July 1999 Paper

Paper

Laser-induced damage of optical coatings grown with surface chemical reaction

Shin-ichi Zaitsu, Takahisa Jitsuno, Shinji Motokoshi, Tatsuhiko Yamanaka

Proceedings Volume 3492, (1999) https://doi.org/10.1117/12.354234

KEYWORDS: Laser damage threshold, Chemical reactions, Laser induced damage, Optical coatings, Refractive index, Molecules, Antireflective coatings, Thin film growth, Thin films, Adsorption

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Proceedings Article | 14 September 1998 Paper

Paper

Development of the diode-pumped solid state laser and its application to laser fusion and industry

Hiroki Matsui, Hideaki Takabe, Tadashi Kanabe, Chiyoe Yamanaka, Hiroshi Azechi, Hiroyuki Furukawa, Takahisa Jitsuno, Tatsuhiko Yamanaka, Hiromitsu Kiriyama, Kunioki Mima, Hirofumi Kan, Masanobu Yamanaka, E. Yoshida, Sadao Nakai, Yasuji Kozaki, Teruo Hiruma, Shinji Motokoshi, Yasukazu Izawa, Kouji Tsubakimoto, Noriaki Miyanaga, Masahiro Nakatsuka

Proceedings Volume 3343, (1998) https://doi.org/10.1117/12.321577

KEYWORDS: Laser welding, Diode pumped solid state lasers, High power lasers, Optical amplifiers, Laser applications, Laser development, Fusion energy, Semiconductor lasers, Solid state lasers, Physics

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Proceedings Article | 14 September 1998 Paper

Paper

First observation of laser-triggered lightning

Chiyoe Yamanaka, Yoshinori Shimada, Kouji Tsubakimoto, Shigeaki Uchida, Zen-ichiro Kawasaki, Yuji Ishikubo, Shinji Motokoshi, Mikio Adachi, Tatsuhiko Yamanaka, Hirohiko Yasuda

Proceedings Volume 3343, (1998) https://doi.org/10.1117/12.321551

KEYWORDS: Plasma, Carbon dioxide lasers, Electrodes, Laser systems engineering, Dielectrics, Signal detection, Aerosols, Interferometers, Laser development, Diagnostics

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Proceedings Article | 14 July 1998 Paper

Paper

Laser-triggered lightning

Chiyoe Yamanaka, Yuji Ishikubo, Shigeaki Uchida, Yoshinori Shimada, Shinji Motokoshi, Zen-ichiro Kawasaki, Mikio Adachi, Hirohiko Yasuda, Tatsuhiko Yamanaka

Proceedings Volume 3423, (1998) https://doi.org/10.1117/12.316594

KEYWORDS: Plasma, Carbon dioxide lasers, Laser systems engineering, Antennas, Interferometers, Laser applications, YAG lasers, Diagnostics, Glasses, Aerosols

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Proceedings Article | 29 July 1992 Paper

Paper

Super-lightweight mirror for laser fusion produced by porous fused silica

Hidetsugu Yoshida, Kunio Yoshida, H. Miyazawa, Yoshiaki Okamoto, Sadao Nakai, Shinji Motokoshi

Proceedings Volume 1624, (1992) https://doi.org/10.1117/12.60122

KEYWORDS: Silica, Mirrors, Laser welding, Laser induced damage, Adaptive optics, Laser development, Glasses, Quartz, Photomicroscopy, Laser engineering

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Showing 5 of 38 publications

Conference Committee Involvement (1)

Laser-Induced Damage in Optical Materials 2023

18 September 2023 | Dublin/Livermore, California, United States

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