Zobrazeno 1 - 10
of 14
pro vyhledávání: '"Nobuto Kageyama"'
Autor:
Kousuke Torii, Nobuto Kageyama, Akira Higuchi, Junya Maeda, Harumasa Yoshida, Takenori Morita, Masahiro Miyamoto, Hiroki Aoshima, Yuta Aoki, Hideyuki Naito, Takehito Nagakura
Publikováno v:
IEEE Journal of Quantum Electronics. 50:510-514
We have demonstrated a high-power 980-nm vertical-cavity surface-emitting laser diode (VCSEL) array with ion-implanted current apertures. The device was characterized on an exclusively developed water-cooled heat sink for the VCSEL array. A peak outp
Autor:
Motoki Takauji, Nobuto Kageyama, Junya Maeda, Harumasa Yoshida, Hirofumi Miyajima, Takehito Nagakura, Takenori Morita, Kousuke Torii
Publikováno v:
IEEE Journal of Quantum Electronics. 48:991-994
We report on our recent development of high power 940 nm laser diodes (LDs) bars. The optimization of the laser structure and thermal management allow over 200-W continuous wave (CW) operation with 58% conversion efficiency from the 1-cm LD bar. We h
Autor:
Hideki Suzuki, Hirofumi Kan, Shinichi Furuta, Teruo Hiruma, Yujin Zheng, Hirofumi Miyajima, Takeshi Kanzaki, Hiroyasu Fujiwara, Nobuto Kageyama, Satoru Oishi, Kousuke Torii, Akiyoshi Watanabe, Takayuki Uchiyama, Masahiro Miyamoto
Publikováno v:
The Review of Laser Engineering. 36:268-272
Autor:
Junya Maeda, Takehito Nagakura, Nobuto Kageyama, Motoki Takauji, Harumasa Yoshida, Kousuke Torii, Takenori Morita, Takayuki Uchiyama
Publikováno v:
IEEE Photonics Technology Letters. :1-1
We report on our recent development of quasi-continuous-wave 940-nm laser diode (LD) bars with passive cooled type. The 10 LD bar stacks with a narrow pitch of 1.54 mm have demonstrated a high output power of 10.1 kW, corresponding to 1 kW/bar, under
Autor:
Kousuke Torii, Takenori Morita, Junya Maeda, Harumasa Yoshida, Masahiro Miyamoto, Motoki Takauji, Nobuto Kageyama, Hirofumi Miyajima, Takehito Nagakura
Publikováno v:
2012 IEEE Photonics Society Summer Topical Meeting Series.
We have developed the 915 nm single emitter LDs with a window structure. A high output power of 20.2 W and a power conversion efficiency of 66% at 10°C have been obtained without COMD. We have also developed the 940 nm LD bars using the thermal expa
Autor:
Junya Maeda, Nobuto Kageyama, Hirofumi Miyajima, Harumasa Yoshida, Motoki Takauji, Takenori Morita, Takehito Nagakura, Kousuke Torii
Publikováno v:
SPIE Proceedings.
High Power Laser Diode (LD) modules are widely used as high-brightness light sources for pumping solid-state lasers and for direct diode laser processing utilizing a compact feature. The LD bars installed in modules are required with higher output po
Autor:
Takayuki Uchiyama, Tomoyuki Natsume, Toru Fujita, Hirofumi Miyajima, Hironobu Kurino, Nobuto Kageyama, Hirofumi Kan, Satoru Oishi, Ryusuke Okamoto, Nobutaka Suzuki, Noriyasu Suzuki, Koji Nishida
Publikováno v:
SPIE Proceedings.
We investigated the properties of fluorinated refrigerants for high-power laser diode bars mounted on a funryu heat sink. The thermal conductivity of fluorinated refrigerants is about ten times lower than that of water, but they are less corrosive to
Autor:
Nobuto Kageyama, Kousuke Torii, Junya Maeda, Hiroki Aoshima, Hideyuki Naito, Takenori Morita, Yuta Aoki, Takehito Nagakura, Akira Higuchi, Harumasa Yoshida, Masahiro Miyamoto
Publikováno v:
Applied Optics. 54:4589
For large-area ion-implanted vertical-cavity surface-emitting lasers (VCSELs), side emission from the edges of a chip disturbs the laser emission of a VCSEL mode, and suppression of it is fundamental. In this paper, we present results of a numerical
Autor:
Koichi Yamakawa, Toru Nagai, Hirofumi Kan, Hiromitsu Kiriyama, Hidetsugu Yoshida, Masahiro Nakatsuka, Nobuto Kageyama, Hirofumi Miyajima
Publikováno v:
Optics letters. 28(18)
We report a high-average-power laser-diode-pumped Nd:YAG master oscillator power amplifier system that has a minimum number of elements in the single multipass zigzag-slab amplifier stage and is used to pump a high-peak-power and high-average-power T
Autor:
KOUSUKE TORN, HIDEYUKI NAITO, MASAHIRO MIYAMOTO, YUTA AOKI, AKIRA HIGUCHI, TAKEHITO NAGAKURA, NOBUTO KAGEYAMA, HIROKI AOSHIMA, TAKENORI MORITA, JUNYA MAEDA, HARUMASA YOSHIDA
Publikováno v:
Applied Optics (1559-128X); 5/10/2015, Vol. 54 Issue 14, p4589-4593, 5p