Zobrazeno 1 - 10
of 91
pro vyhledávání: '"Tokuhito Sasaki"'
Autor:
Naoki Oda, Tokuhito Sasaki, Ryo Imai, Masaru Miyoshi, Kuniaki Konishi, Makoto Kuwata-Gonokami, Seiji Kurashina, Natsuki Nemoto, Natsuki Kanda
Publikováno v:
IEEE Transactions on Terahertz Science and Technology. 6:175-182
Terahertz (THz) cameras comprising an uncooled micro-bolometer array have been developed for simple THz imaging, and the improvement of their sensitivity is one of the important issues. We fabricated a new micro-bolometer array with a resonant cavity
Autor:
Takao Morimoto, Takayuki Sudou, Seiji Kurashina, Naoki Oda, Tokuhito Sasaki, Masaru Miyoshi, Tsutomu Ishi, Kohei Doi, Hideki Goto
Publikováno v:
Journal of Infrared, Millimeter, and Terahertz Waves. 36:947-960
A pixel in an uncooled microbolometer terahertz (THz) focal plane array (FPA) has a suspended structure above read-out integrated circuit (ROIC) substrate. An optical cavity structure is formed between a thin metallic layer deposited on the suspended
Autor:
Masaru Miyoshi, Tsutomu Ishi, Hideki Goto, Tokuhito Sasaki, Akinori Irizawa, Kohei Doi, Naoki Oda, Takayuki Sudou, Seiji Kurashina, Ryukou Kato, Takao Morimoto, Goro Isoyama, Keigo Kawase
Publikováno v:
Terahertz Physics, Devices, and Systems IX: Advanced Applications in Industry and Defense.
Uncooled microbolometer-type 640x480 and 320x240 Terahertz (THz) focal plane arrays (FPAs) with enhanced sensitivity in sub-THz region are developed, and incorporated into 640x480 and 320x240 cameras, respectively. The pixel in the THz-FPA has such a
Autor:
M. Sumino, Masaki Ohya, R. Kobayashi, I. Masumoto, Masashige Matsudate, Chiaki Sasaoka, K. Naniwae, Kazuhisa Fukuda, Shigeru Kohmoto, E. Mizuki, K. Kudo, Kazuhiro Shiba, Tokuhito Sasaki, Kenichi Nishi
Publikováno v:
physica status solidi (a). 203:1824-1828
We report the 1000 mW single mode operation of a planar blue-violet laser diode with inner stripe waveguide. Kink-free output surpassed 400 mW (CW) and 600 mW (50 ns pulsed, duty 50%) at temperatures up to 90 °C. Precise optical field design for nar
Autor:
Kohroh Kobayashi, Tetsuro Okuda, K. Sato, S. Ae, N. Suzuki, Tokuhito Sasaki, Y. Muroya, Yidong Huang, K. Mori
Publikováno v:
IEEE Journal of Quantum Electronics. 38:1479-1484
Clarifies that phase shift value in directly modulated distributed feedback laser diodes (DFB-LDs) affects their chirp characteristics and resistance to external optical feedback because of the feedback effect of mirror loss (FEML). Comparing /spl la
Autor:
Hideki Goto, Masaru Miyoshi, Takao Morimoto, Kohei Doi, Tokuhito Sasaki, Takayuki Sudou, Tsutomu Ishi, Naoki Oda, Seiji Kurashina
Publikováno v:
2014 39th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz).
Publikováno v:
Optical and Quantum Electronics. 33:709-725
We describe a method for pulse-repetition-frequency tuning of mode-locked laser diodes (MLLDs) monolithically integrated with a distributed Bragg reflector (DBR). The pulse-repetition frequency, i.e., the cavity-roundtrip time, is tuned through loss-
Autor:
Tokuhito Sasaki, Keiro Komatsu, Hiroshi Hatakeyama, S. Kitamura, M. Yamaguchi, Kiichi Hamamoto
Publikováno v:
IEEE Journal of Quantum Electronics. 35:1067-1074
A spot-size converter integrated semiconductor optical amplifier (SSC-SOA) was developed as a gate element in an optical switch matrix for photonic switching applications. By a selective metal-organic vapor phase epitaxy technique, a bulk InGaAsP str
Autor:
Tokuhito Sasaki, Kuniyuki Okuyama, Takashi Yamamoto, Kentaro Shinoda, Masaru Miyoshi, Yutaka Tanaka, Takao Yamazaki, Tsutomu Endoh, Haruo Ishizaki, Tetsuo Tsuchiya, Kouji Katoh, Seiji Kurashina, Tomohiko Nakajima, Shigeru Tohyama, Yuuhi Okuda
Publikováno v:
SPIE Proceedings.
Uncooled infrared detectors with 12μm pixel pitch video graphics array (VGA) have been developed. To improve the signal to noise ratio (SNR) for 12μm pixel pitch, a highly sensitive bolometer material, an advanced pixel structure for thermal isolat
Autor:
Takao Morimoto, Taku Tsuboi, Takayuki Sudou, Takao Yamazaki, Naoki Oda, Tsutomu Ishi, Tokuhito Sasaki, Masaru Miyoshi, Seiji Kurashina
Publikováno v:
SPIE Proceedings.
This paper describes features of uncooled palm-size and real-time Terahertz (THz) imager. The THz imager and powerful THz quantum cascade laser were assembled into THz microscope with which THz images of narrow string were obtained at 4.3 and 2.0 THz