Dr. Hajime Okada Profile

Dr. Hajime Okada

Senior Engineer at QST

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Author

Publications (5)

Proceedings Article | 14 March 2018 Presentation

Development of high-energy and high repetition rate compact pulse laser system for inspection of tunnel concrete (Conference Presentation)

Hajime Okada, Noboru Hasegawa, Katsuhiro Mikami, Toshiyuki Kitamura, Shuji Kondo, Masaharu Nishikino, Tetsuya Kawachi

Proceedings Volume 10511, 105110U (2018) https://doi.org/10.1117/12.2291157

KEYWORDS: Nd:YAG lasers, Pulsed laser operation, Oscillators, Laser systems engineering, Optical amplifiers, Crystals, Laser development, Thermal effects, Energy efficiency, Inspection

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SPIE Journal Paper | 9 February 2018 Open Access

Demonstration of 25-Hz-inspection-speed laser remote sensing for internal concrete defects

Shinri Kurahashi, Katsuhiro Mikami, Toshiyuki Kitamura, Noboru Hasegawa, Hajime Okada, Shuji Kondo, Masaharu Nishikino, Tetsuya Kawachi, Yoshinori Shimada

JARS, Vol. 12, Issue 01, 015009, (February 2018) https://doi.org/10.1117/12.10.1117/1.JRS.12.015009

KEYWORDS: Inspection, Laser systems engineering, Lawrencium, Remote sensing, Laser development, Crystals, Laser crystals, Pulsed laser operation, Optical amplifiers, Mirrors

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Proceedings Article | 14 November 2013 Paper

Development of high resistant anti-reflection coating by using Al2O3/SiO2 multilayer

Yoshihiro Ochi, Keisuke Nagashima, Hajime Okada, Momoko Tanaka, Ryo Tateno, Yasuyuki Furukawa, Akira Sugiyama

Proceedings Volume 8885, 88851Z (2013) https://doi.org/10.1117/12.2030096

KEYWORDS: Antireflective coatings, Laser damage threshold, Multilayers, Silica, Laser induced damage, Picosecond phenomena, Coating, Optical amplifiers, Reflectivity, Pulsed laser operation

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Proceedings Article | 7 May 2009 Paper

XUV and IR electromagnetic radiation from nonlinear laser-plasma interaction

Masaki Kando, Alexander Pirozhkov, Yuji Fukuda, Timur Esirkepov, Izuru Daito, Keigo Kawase, Jinglong Ma, Liming Chen, Yukio Hayashi, Michiaki Mori, Koichi Ogura, Hideyuki Kotaki, Akito Sagisaka, Evgeny Ragozin, Anatoly Faenov, Tatiana Pikuz, Hiromitsu Kiriyama, Hajime Okada, Takashi Kameshima, James Koga, Tetsuya Kawachi, Hiroyuki Daido, Toyoaki Kimura, Yoshiaki Kato, Toshiki Tajima, Sergei Bulanov

Proceedings Volume 7359, 73590K (2009) https://doi.org/10.1117/12.820463

KEYWORDS: Mirrors, Plasmas, Pulsed laser operation, Extreme ultraviolet, Signal detection, Polarization, Infrared radiation, Electromagnetic radiation, Solitons, Charge-coupled devices

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Proceedings Article | 24 May 2000 Paper

Gain stabilized configuration in PRCM circuit and optical bus system

Takahiko Nakatogawa, Atsushi Okamoto, Kentaro Watanabe, Kunihiro Sato, Hajime Okada

Proceedings Volume 4089, (2000) https://doi.org/10.1117/12.386852

KEYWORDS: Laser beam diagnostics, Beam controllers, Phase conjugation, Optical circuits, Integrated optics, Crystals, Four wave mixing, Laser crystals, Energy transfer, Active optics

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