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

Read Abstract +

Proceedings Article | 11 October 2018 Presentation + Paper

Overview of vegetation Lidar “MOLI”

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

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

KEYWORDS: Vegetation, LIDAR, Satellites, Aerospace engineering

Read Abstract +

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

DOWNLOAD PAPER

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

Read Abstract +

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

Read Abstract +

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

Read Abstract +

Proceedings Article | 17 November 2014 Paper

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

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

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

Read Abstract +

Proceedings Article | 22 October 2013 Paper

Overview of Japan's spaceborne vegetation lidar mission

Jumpei Murooka, Takashi Kobayashi, Daisuke Sakaizawa, Tadashi Imai, Keiko Suzuki, Ryota Sato, Shiro Yamakawa, 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

Read Abstract +

Proceedings Article | 17 September 2013 Paper

2-μm coherent lidar for CO2 and wind measurements

Shoken Ishii, Kohei Mizutani, Philippe Baron, Hironori Iwai, 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

Read Abstract +

Proceedings Article | 19 November 2012 Paper

Simulation and visualization of echo signals from forest for iLOVE

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

Read Abstract +

Proceedings Article | 19 November 2012 Paper

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

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

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

Read Abstract +

Proceedings Article | 19 November 2012 Paper

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

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

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

Read Abstract +

Proceedings Article | 19 November 2012 Paper

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

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

Read Abstract +

Proceedings Article | 19 November 2012 Paper

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

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

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

Read Abstract +

Proceedings Article | 11 November 2010 Paper

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

Nobuo Sugimoto, Tomohiro Terasaki, Kazuhiro Asai, Atsushi Sato

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

Read Abstract +

Proceedings Article | 11 November 2010 Paper

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

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

Read Abstract +

Proceedings Article | 29 October 2010 Paper

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

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

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

Read Abstract +

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

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

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

Read Abstract +

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

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

Read Abstract +

Proceedings Article | 9 December 2008 Paper

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

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

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

Read Abstract +

Proceedings Article | 22 December 2006 Paper

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

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

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

Read Abstract +

Proceedings Article | 12 December 2006 Paper

Characteristics of pulsed/cw vanadate lasers operating at 2 micron

Kazuhiro Asai, Atsushi Sato, 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

Read Abstract +

Proceedings Article | 30 November 2006 Paper

Development of 2-μm airborne coherent Doppler lidar at NICT

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

Read Abstract +

Proceedings Article | 12 January 2005 Paper

Development of coherent Doppler lidar for wind profiling

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

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

Read Abstract +

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

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

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

Read Abstract +

Proceedings Article | 21 March 2003 Paper

Development of coherent Doppler lidar at CRL

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

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

Read Abstract +

Proceedings Article | 21 March 2003 Paper

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

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

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

Read Abstract +

Proceedings Article | 9 January 2002 Paper

Performance of an incoherent Doppler lidar system

Toshikasu Itabe, Shoken Ishii, Kohei Mizutani, 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

Read Abstract +

Proceedings Article | 1 May 2001 Paper

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

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

Read Abstract +