Dr. Kazuhiro Asai Profile

Dr. Kazuhiro Asai

Professor Emeritus at Tohoku Institute of Technology

SPIE Involvement:

Author | Editor

Publications (40)

Proceedings Article | 14 October 2019 Presentation + Paper

Development status of MOLI (Multi-footprint Observation lidar and Imager)

Jumpei Murooka, Rei Mitsuhashi, Daisuke Sakaizawa, Tadashi Imai, Toshiyoshi Kimura, Kazuhiro Asai, Kohei Mizutani

Proceedings Volume 11151, 1115106 (2019) https://doi.org/10.1117/12.2534429

KEYWORDS: LIDAR, Imaging systems, Error analysis, Signal detection, Carbon, L band, Transmitters, Biological research, Carbon dioxide, Absorption

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Proceedings Article | 11 October 2018 Presentation + Paper

Overview of vegetation Lidar “MOLI”

Rei Mitsuhashi, Jumpei Murooka, Daisuke Sakaizawa, Tadashi Imai, Toshiyoshi Kimura, Kazuhiro Asai, Haruhisa Shimoda

Proceedings Volume 10785, 107850Q (2018) https://doi.org/10.1117/12.2326225

KEYWORDS: Vegetation, LIDAR, Satellites, Aerospace engineering

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SPIE Journal Paper | 21 March 2017 Open Access

Special Section Guest Editorial: Active Electro-Optical Sensing: Phenomenology, Technology, and Applications

Paul McManamon, Walter Buell, Gary Kamerman, Ove Steinvall, Kazuhiro Asai

OE, Vol. 56, Issue 03, 031201, (March 2017) https://doi.org/10.1117/12.10.1117/1.OE.56.3.031201

KEYWORDS: LIDAR, Active remote sensing, Electro optics, Stereoscopy, Sensors, Optical engineering, Aerospace engineering, Defense and security, Defense technologies, Environmental sensing

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Proceedings Article | 5 May 2016 Paper

Overview and status of vegetation lidar mission MOLI

Jumpei Murooka, Daisuke Sakaizawa, Tadashi Imai, Toshiyoshi Kimura, Kazuhiro Asai

Proceedings Volume 9879, 987908 (2016) https://doi.org/10.1117/12.2227965

KEYWORDS: LIDAR, Vegetation, Carbon, Aerospace engineering, Imaging systems, Sensors, Transmitters, Pulsed laser operation, Laser energy, Atmospheric monitoring

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Proceedings Article | 5 May 2016 Paper

Development of Tm:fiber laser-pumped Ho:YLF laser

Kohei Mizutani, Shoken Ishii, Kazuhiro Asai, Atsushi Sato

Proceedings Volume 9879, 987903 (2016) https://doi.org/10.1117/12.2224692

KEYWORDS: Laser development, LIDAR, Resonators, Amplifiers, Carbon dioxide lasers, Wind measurement, Oscillators, Optical amplifiers, Mirrors, Pulsed laser operation

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Proceedings Article | 17 November 2014 Paper

Development of Ho:YLF laser pumped by Tm:fiber laser

Kohei Mizutani, Shoken Ishii, Toshikazu Itabe, Kazuhiro Asai, Atsushi Sato

Proceedings Volume 9262, 926205 (2014) https://doi.org/10.1117/12.2069806

KEYWORDS: Oscillators, Laser development, Amplifiers, Carbon dioxide lasers, Resonators, Carbon dioxide, Mirrors, Optical amplifiers, Laser applications

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Proceedings Article | 17 November 2014 Paper

A design strategy for a high-energy Tm,Ho: YLF laser transmitter

Atsushi Sato, Kazuhiro Asai, Yoshiki Miyake, Shoken Ishii, Kohei Mizutani, Satoshi Ochiai

Proceedings Volume 9262, 926215 (2014) https://doi.org/10.1117/12.2069367

KEYWORDS: Oscillators, Rod lasers, Q switching, Pulsed laser operation, Numerical simulations, Thulium, Holmium, Mirrors, Transmitters, Amplifiers

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Proceedings Article | 22 October 2013 Paper

Overview of Japan's spaceborne vegetation lidar mission

Jumpei Murooka, Takashi Kobayashi, Tadashi Imai, Keiko Suzuki, Daisuke Sakaizawa, Shiro Yamakawa, Ryota Sato, Haruo Sawada, Kazuhiro Asai

Proceedings Volume 8894, 88940B (2013) https://doi.org/10.1117/12.2029119

KEYWORDS: LIDAR, Vegetation, Signal to noise ratio, Sensors, Imaging systems, Detector arrays, Prototyping, Carbon, Pulsed laser operation, Space telescopes

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Proceedings Article | 17 September 2013 Paper

2-μm coherent lidar for CO2 and wind measurements

Shoken Ishii, Hironori Iwai, Kohei Mizutani, Philippe Baron, Toshikazu Itabe, Hirotake Fukuoka, Takayoshi Ishikawa, Atsushi Sato, Kazuhiro Asai

Proceedings Volume 8872, 887206 (2013) https://doi.org/10.1117/12.2026165

KEYWORDS: LIDAR, Wind measurement, Carbon dioxide, Carbon dioxide lasers, Wind energy, Semiconductor lasers, Doppler effect, Absorption, Sensors, Laser development

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Proceedings Article | 19 November 2012 Paper

Simulation and visualization of echo signals from forest for iLOVE

Takahiro Endo, Takashi Kobayashi, Yohei Satoh, Yoshito Sawada, Nobuo Sugimoto, Kohei Mizutani, Haruo Sawada, Kazuhiro Asai

Proceedings Volume 8526, 85260L (2012) https://doi.org/10.1117/12.981582

KEYWORDS: Sensors, Signal processing, 3D modeling, Signal generators, Visualization, Reflectivity, Particles, LIDAR, 3D acquisition, Ray tracing

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Proceedings Article | 19 November 2012 Paper

Measuring forest canopy height using ICESat/GLAS data for applying to Japanese spaceborne lidar mission

Masato Hayashi, Nobuko Saigusa, Hiroyuki Oguma, Yoshiki Yamagata, Gen Takao, Haruo Sawada, Kohei Mizutani, Nobuo Sugimoto, Kazuhiro Asai

Proceedings Volume 8526, 85260M (2012) https://doi.org/10.1117/12.981583

KEYWORDS: LIDAR, Data modeling, Data acquisition, Error analysis, Statistical methods, Statistical analysis, Environmental sensing, Vegetation, Remote sensing, Synthetic aperture radar

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Proceedings Article | 19 November 2012 Paper

i-LOVE: ISS-JEM lidar for observation of vegetation environment

Kazuhiro Asai, Haruo Sawada, Nobuo Sugimoto, Kohei Mizutani, Shoken Ishii, Tomoaki Nishizawa, Haruhisa Shimoda, Yoshiaki Honda, Koji Kajiwara, Gen Takao, Yasumasa Hirata, Nobuko Saigusa, Masatomo Hayashi, Hiroyuki Oguma, Hideki Saito, Yoshio Awaya, Takahiro Endo, Tadashi Imai, Jumpei Murooka, Takashi Kobatashi, Keiko Suzuki, Ryota Sato

Proceedings Volume 8526, 85260K (2012) https://doi.org/10.1117/12.981326

KEYWORDS: LIDAR, Vegetation, Sensors, Detector arrays, Atmospheric modeling, Signal to noise ratio, Clouds, Aerosols, Atmospheric optics, Atmospheric particles

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Proceedings Article | 19 November 2012 Paper

Development of a simultaneous dual-wavelength Q-switched Nd:YAG laser at 1064 and 1319 nm

Atsushi Sato, Takumi Abe, Shimpei Okubo, Kazuhiro Asai, Nobuo Sugimoto, Shoken Ishii, Kohei Mizutani

Proceedings Volume 8526, 852606 (2012) https://doi.org/10.1117/12.977317

KEYWORDS: Q switched lasers, Q switching, Pulsed laser operation, Nd:YAG lasers, Resonators, Semiconductor lasers, LIDAR, Mirrors, Laser resonators, Laser stabilization

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Proceedings Article | 19 November 2012 Paper

Conductive-cooled 2-micron laser development for wind and CO2 measurements

Kohei Mizutani, Shoken Ishii, Motoaki Yasui, Toshikazu Itabe, Atsushi Sato, Kazuhiro Asai, Hirotake Fukuoka, Takayoshi Ishikawa

Proceedings Volume 8526, 852603 (2012) https://doi.org/10.1117/12.973651

KEYWORDS: Carbon dioxide lasers, Wind measurement, Carbon dioxide, Laser development, LIDAR, Oscillators, Semiconductor lasers, Fiber lasers, Doppler effect, Rod lasers

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Proceedings Article | 11 November 2010 Paper

Lidar for observation of vegetation environment from International Space Station (ISS)/Japanese Experiment Module (JEM)-Exposed Facility (EF)

Kazuhiro Asai, Atsushi Sato, Tomohiro Terasaki, Nobuo Sugimoto

Proceedings Volume 7860, 78600G (2010) https://doi.org/10.1117/12.871982

KEYWORDS: Vegetation, LIDAR, Sensors, Neodymium, Imaging systems, Q switching, Neodymium lasers, Pulsed laser operation, Semiconductor lasers, Transmitters

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Proceedings Article | 11 November 2010 Paper

Characteristics of high-energy Q-switched neodymium lasers operating near 1320 nm

Atsushi Sato, Tomohiro Terasaki, Takumi Abe, Yoshiki Miyake, Kazuhiro Asai, Shoken Ishii, Kohei Mizutani

Proceedings Volume 7860, 78600H (2010) https://doi.org/10.1117/12.869509

KEYWORDS: Neodymium lasers, Nd:YAG lasers, Q switched lasers, Semiconductor lasers, Q switching, Rod lasers, Optical filters, Resonators, Neodymium, Waveguides

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Proceedings Article | 29 October 2010 Paper

Development of coherent 2-μm differential absorption and wind lidar with laser frequency offset locking technique

S. Ishii, K. Mizutani, H. Fukuoka, T. Ishikawa, P. Baron, H. Iwai, T. Aoki, T. Itabe, A. Sato, K. Asai

Proceedings Volume 7860, 786004 (2010) https://doi.org/10.1117/12.871327

KEYWORDS: Carbon dioxide, Absorption, Carbon dioxide lasers, LIDAR, Pulsed laser operation, Laser stabilization, Q switched lasers, Continuous wave operation, Heterodyning, Semiconductor lasers

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Proceedings Article | 12 August 2009 Paper

Path-averaged atmospheric CO2 measurement using a 1.57 μm active remote sensor compared with multi-positioned in situ sensors

Daisuke Sakaizawa, Shuji Kawakami, Masakatsu Nakajima, Yosuke Sawa, Hidekazu Matsueda, Kazuhiro Asai, Syumpei Kameyama, Masaharu Imaki, Yoshihito Hirano, Shinichi Ueno

Proceedings Volume 7460, 746006 (2009) https://doi.org/10.1117/12.828573

KEYWORDS: Carbon dioxide, Sensors, Absorption, Atmospheric sensing, Environmental sensing, Remote sensing, Spectroscopy, In situ metrology, In situ remote sensing, Atmospheric laser remote sensing

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Proceedings Article | 9 December 2008 Paper

Development of a high-energy, quasi-three-level Nd:YVO4 laser at 914 nm for deep-blue light generation

Atsushi Sato, Yohei Nitsuma, Tomohiro Terasaki, Kazuhiro Asai, Shoken Ishii, Kohei Mizutani, Toshikazu Itabe

Proceedings Volume 7153, 715316 (2008) https://doi.org/10.1117/12.806395

KEYWORDS: Neodymium lasers, Neodymium, Rod lasers, Absorption, Nd:YAG lasers, Head, Q switched lasers, Vegetation, Pulsed laser operation, Mirrors

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Proceedings Article | 9 December 2008 Paper

Conductive-cooled 2-micron laser for CO2 and wind observations

Kohei Mizutani, Toshikazu Itabe, Shoken Ishii, Tetsuo Aoki, Kazuhiro Asai, Atsushi Sato, Hirotake Fukuoka, Takayoshi Ishikawa

Proceedings Volume 7153, 71530J (2008) https://doi.org/10.1117/12.804807

KEYWORDS: Carbon dioxide, Carbon dioxide lasers, LIDAR, Doppler effect, Semiconductor lasers, Laser development, Q switching, Q switched lasers, Resonators, Oscillators

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Proceedings Article | 22 December 2006 Paper

Characterization of thulium- and holmium-doped YAG ceramic laser materials

Yoshiharu Urata, Toshimasa Kozeki, Akihito Kudo, Atsushi Sato, Kazuhiro Asai, Satoshi Wada

Proceedings Volume 6409, 64091J (2006) https://doi.org/10.1117/12.697908

KEYWORDS: Ceramics, Crystals, YAG lasers, Thulium, Diodes, Holmium, Absorption, Ions, Semiconductor lasers, Pulsed laser operation

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Proceedings Article | 12 December 2006 Paper

Characteristics of pulsed/cw vanadate lasers operating at 2 micron

Atsushi Sato, Kazuhiro Asai, Shoken Ishii, Kohei Mizutani, Toshikazu Itabe

Proceedings Volume 6409, 640916 (2006) https://doi.org/10.1117/12.694189

KEYWORDS: Semiconductor lasers, Laser crystals, Pulsed laser operation, Holmium, Rod lasers, Laser development, Thulium, Reflectivity, Continuous wave operation, Head

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Proceedings Article | 30 November 2006 Paper

Development of 2-μm airborne coherent Doppler lidar at NICT

S. Ishii, K. Mizutani, T. Itabe, T. Aoki, Y. Ohno, H. Horie, T. Shimabukuro, A. Sato, K. Asai

Proceedings Volume 6409, 64090J (2006) https://doi.org/10.1117/12.693526

KEYWORDS: Doppler effect, LIDAR, Wind measurement, Algorithm development, Signal processing, Bragg cells, Scanners, Pulsed laser operation, Sensors, Calibration

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Proceedings Article | 12 January 2005 Paper

Development of coherent Doppler lidar for wind profiling

Kohei Mizutani, Toshikazu Itabe, Shoken Ishii, Tetsuo Aoki, Masahiko Sasano, Kazuhiro Asai, Atsushi Sato

Proceedings Volume 5653, (2005) https://doi.org/10.1117/12.578266

KEYWORDS: LIDAR, Doppler effect, Wind measurement, Algorithm development, Scanners, Atmospheric modeling, Profiling, Solid state lasers, Aerosols, Amplifiers

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Proceedings Article | 12 January 2005 Paper

Normal-mode and Q-switched operations of a conductively cooled Tm,Ho:LLF laser with a triangular-prism rod

Atsushi Sato, Kazuhiro Asai, Hiroshi Machida, Yoshiharu Urata, Satoshi Wada, Kohei Mizutani, Toshikazu Itabe

Proceedings Volume 5653, (2005) https://doi.org/10.1117/12.578189

KEYWORDS: Rod lasers, Q switched lasers, Waveguides, Q switching, Polishing, Surface finishing, Pulsed laser operation, Mirrors, Reflection, Resonators

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Proceedings Article | 21 March 2003 Paper

Development of coherent Doppler lidar at CRL

Kohei Mizutani, Toshikasu Itabe, Shoken Ishii, Masahiko Sasano, Tetsuo Aoki, Yuichi Ohno, Kazuhiro Asai

Proceedings Volume 4893, (2003) https://doi.org/10.1117/12.466099

KEYWORDS: LIDAR, Doppler effect, Wind measurement, Satellites, Troposphere, Telescopes, Algorithm development, Microwave radiation, Semiconductor lasers, Power supplies

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Proceedings Article | 21 March 2003 Paper

Coherent Doppler lidar system for airborne measurement: a ground-based experiment of atmospheric wind profiling

Shoken Ishii, Kohei Mizutani, Masahiko Sasano, Toshikasu Itabe, Kazuhiro Asai

Proceedings Volume 4893, (2003) https://doi.org/10.1117/12.466074

KEYWORDS: Wind measurement, Doppler effect, LIDAR, Velocity measurements, Algorithm development, Bragg cells, Aerosols, Telecommunications, Profiling, Signal processing

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Proceedings Article | 9 January 2002 Paper

Performance of an incoherent Doppler lidar system

Shoken Ishii, Kohei Mizutani, Toshikasu Itabe, Kazuhiro Asai

Proceedings Volume 4484, (2002) https://doi.org/10.1117/12.452788

KEYWORDS: Doppler effect, LIDAR, Atmospheric modeling, Fabry–Perot interferometers, Atmospheric particles, Wind measurement, Optical filters, Quantum efficiency, Convolution, Error analysis

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Proceedings Article | 1 May 2001 Paper

Growth and characterization of Tm,Ho-doped LuLiF4 and YLiF4 crystals

Vikas Sudesh, Kazuhiro Asai, Akihito Kudou, Kazushige Ito, Kiyoshi Shimamura, Tsuguo Fukuda

Proceedings Volume 4268, (2001) https://doi.org/10.1117/12.424638

KEYWORDS: Crystals, Thulium, Laser crystals, Holmium, Semiconductor lasers, Ions, Absorption, Optical pumping, Control systems, Output couplers

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