Dr. Junji Kawanaka Profile

Dr. Junji Kawanaka

at Osaka Univ

SPIE Involvement:

Author

Publications (18)

Proceedings Article | 13 March 2024 Presentation

Presentation

High power conduction-cooled active-mirror laser

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, Junji Kawanaka

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 | 7 March 2019 Presentation + Paper

Presentation + Paper

Development of a 10-J, 10-Hz laser amplifier system with cryo-cooled Yb:YAG ceramics using active-mirror method

Y. Kabeya, T. Morita, Y. Hatano, T. Iguchi, Y. Muramatsu, T. Sekine, Y. Takeuchi, T. Kurita, Y. Tamaoki, K. Iyama, M. Kurata, Y. Mizuta, K. Kawai, Y. Kato, S. Tokita, J. Kawanaka

Proceedings Volume 10896, 108960M (2019) https://doi.org/10.1117/12.2510767

KEYWORDS: Ceramics, Laser systems engineering, Amplifiers, Pulsed laser operation, Head, Laser amplifiers, Laser processing, Fiber lasers, Lasers, Laser applications

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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 | 9 October 2018 Presentation + Paper

Presentation + Paper

Development of the marine Raman lidar system

T. Somekawa, S. Kurahashi, J. Kawanaka, M. Fujita

Proceedings Volume 10791, 1079104 (2018) https://doi.org/10.1117/12.2324955

KEYWORDS: Raman spectroscopy, LIDAR, Water, Oceanography, Spectroscopy, Fluctuations and noise, Telescopes, Neodymium, Signal detection, Charge-coupled devices

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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, K. Mikami, T. Mikami, T. Kawasaki, J. Kawanaka, N. Miyanaga

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

Takuya Mikami, Takayuki Okamoto, Kunio Yoshida, Takahisa Jitsuno, Shinji Motokoshi, 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 | 1 May 2015 Paper

Paper

World's largest high energy petawatt laser LFEX as a user's facility

H. Shiraga, N. Miyanaga, J. Kawanaka, S. Tokita, T. Jitsuno, Y. Nakata, S. Fujioka, H. Azechi

Proceedings Volume 9515, 95150S (2015) https://doi.org/10.1117/12.2181654

KEYWORDS: Optical amplifiers, Picosecond phenomena, Mirrors, Fusion energy, Physics, Pulsed laser operation, Fiber amplifiers, Diffraction gratings, Laser energy, Laser irradiation

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Proceedings Article | 17 February 2010 Paper

Paper

Thermal effect of cryogenic Yb:YAG total-reflection active-mirror laser

H. Furuse, J. Kawanaka, N. Miyanaga, T. Saiki, M. Fujita, K. Imasaki, K. Takeshita, S. Ishii, Y. Izawa

Proceedings Volume 7578, 75780I (2010) https://doi.org/10.1117/12.840599

KEYWORDS: Thermal effects, Ceramics, Composites, Cryogenics, Liquids, Nitrogen, Temperature metrology, Laser applications, Luminescence, Laser optics

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Proceedings Article | 31 December 2009 Paper

Paper

Laser-induced damage thresholds in silica glasses at different temperature

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

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

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 | 23 March 2005 Paper

Paper

Quantum-defect-limited operation of Yb:YAG crystal

Junji Kawanaka, Takahiro Shoji, Shigeki Tokita, Masayuki Fujita, Yasukazu Izawa

Proceedings Volume 5777, (2005) https://doi.org/10.1117/12.611033

KEYWORDS: Crystals, Laser crystals, Diodes, Semiconductor lasers, Oscillators, Ytterbium, Fusion energy, Output couplers, Ions, Copper

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Proceedings Article | 23 March 2005 Paper

Paper

Diode-pumped Yb:YLF chirped-pulse regenerative amplifier for high average power operation

Junji Kawanaka, Hajime Nishioka, Koichi Yamakawa, Ken-ichi Ueda

Proceedings Volume 5777, (2005) https://doi.org/10.1117/12.611030

KEYWORDS: Crystals, Laser crystals, Semiconductor lasers, Optical amplifiers, Pulsed laser operation, Copper, Sapphire lasers, Liquid crystals, Diodes, Liquids

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Proceedings Article | 10 November 2003 Paper

Paper

20-mJ diode-pumped chirped-pulse regenerative amplifier with a cooled Yb:LiYF4

Junji Kawanaka, Hajime Nishioka, Koichi Yamakawa, K. Ueda

Proceedings Volume 5120, (2003) https://doi.org/10.1117/12.515525

KEYWORDS: Crystals, Optical amplifiers, Laser crystals, Semiconductor lasers, Mirrors, Laser systems engineering, Laser development, Sapphire lasers, High power lasers, Reflectors

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Proceedings Article | 10 November 2003 Paper

Paper

Oscillation characteristics of a discharge pumped VUV Kr excimer laser

Takahiro Shirai, Takeshi Higashiguchi, Shoichi Kubodera, Wataru Sasaki, Junji Kawanaka, Tatsushi Igarashi

Proceedings Volume 5120, (2003) https://doi.org/10.1117/12.515513

KEYWORDS: Electrodes, Vacuum ultraviolet, Krypton, Excimers, Excimer lasers, Beam shaping, Reflectors, Gas lasers, Pulsed laser operation, Feedback signals

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Proceedings Article | 25 January 2001 Paper

Paper

Discharge-pumped vacuum ultraviolet Kr2* laser

Takahiro Shirai, Wataru Sasaki, Shoichi Kubodera, Junji Kawanaka, Tatsushi Igarashi

Proceedings Volume 4184, (2001) https://doi.org/10.1117/12.414084

KEYWORDS: Vacuum ultraviolet, Krypton, Excimer lasers, Gas lasers, Electrodes, Gases, Excimers, Capacitors, Inductance, Switching

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Proceedings Article | 25 January 2001 Paper

Paper

Energy extraction performance for a diode-pumped CPA system in Yb-doped materials at low temperature

Junji Kawanaka, Hajime Nishioka, Norihiro Inoue, Yoshinori Kubota, Ken-ichi Ueda

Proceedings Volume 4184, (2001) https://doi.org/10.1117/12.414095

KEYWORDS: Absorption, Semiconductor lasers, Energy efficiency, Crystals, Polarization, Pulsed laser operation, Oscillators, Glasses, Laser damage threshold, Laser development

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Proceedings Article | 22 December 1998 Paper

Paper

1.5-kW high peak power and 140-ns short-pulse krypton excimer lamp using a pulsed silent discharge

Junji Kawanaka, Takahiro Shirai, Shoichi Kubodera, Wataru Sasaki

Proceedings Volume 3574, (1998) https://doi.org/10.1117/12.334473

KEYWORDS: Excimers, Krypton, Vacuum ultraviolet, Lamps, Ionization, Light sources, Gas lasers, Excimer lasers, Quartz, Pulsed laser operation

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Proceedings Article | 4 April 1997 Paper

Paper

Efficient VUV light sources from rare gas excimers and their applications

Wataru Sasaki, Shoichi Kubodera, Junji Kawanaka

Proceedings Volume 3092, (1997) https://doi.org/10.1117/12.270264

KEYWORDS: Excimers, Argon, Lamps, Vacuum ultraviolet, Krypton, Xenon, Polymethylmethacrylate, Light sources, Gases, Etching

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Showing 5 of 18 publications

Conference Committee Involvement (3)

High-Energy and Power Diode-Pumped Laser Technologies

7 April 2025 | Prague, Czech Republic

High Power Lasers and Applications

19 April 2021 | Online Only, Czech Republic

High-Power, High-Energy, and High-Intensity Laser Technology

3 April 2019 | Prague, Czech Republic

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