Zobrazeno 1 - 10
of 21
pro vyhledávání: '"Takehito Nagakura"'
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:
Junya Maeda, Hiroki Aoshima, Takehito Nagakura, Kousuke Torii, Harumasa Yoshida, Motoki Takauji, Takenori Morita, Hideyuki Naito
Publikováno v:
IEEE Photonics Technology Letters. 27:1660-1662
We report on the long-term reliable continuous wave (CW) operation of high-power and high-efficiency 915-nm broad-area laser diodes (BA-LDs). An output power of over 20 W and a maximum power-conversion efficiency of over 65% have been marked at a hea
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
Publikováno v:
Journal of Luminescence. 86:117-123
Site distributions of Eu3+ ions doped in Al2O3–SiO2 glasses were studied by the fluorescence line narrowing (FLN) and the persistent spectral hole-burning (PSHB) spectroscopies. The FLN spectra showed that the Eu3+ ions were accommodated in two dif
Publikováno v:
Journal of Sol-Gel Science and Technology. 19:253-256
Persistent spectral hole burning was studied in Eu3+ ions-doped Al2O3-SiO2 glass prepared by a sol-gel method. The gel synthesized by the hydrolysis of Si- and Al-alkoxides and EuCl3·6H2O was heated in air and hydrogen gas atmospheres. For the glass
Publikováno v:
Journal of Physics: Condensed Matter. 11:335-343
Persistent spectral hole burning (PSHB) was investigated in -doped glass prepared by the sol-gel method. The hole was burned in the line of the ions using a rhodamine 6G dye laser at 77 K, the hole area of which was proportionally increased with the
Autor:
Masahiro Miyamoto, Harumasa Yoshida, Takehito Nagakura, Junya Maeda, Motoki Takauji, Takenori Morita, Kousuke Torii
Publikováno v:
2013 Conference on Lasers & Electro-Optics Europe & International Quantum Electronics Conference CLEO EUROPE/IQEC.
Summary form only given. High power broad-area laser diodes at 9xx-nm have been widely employed in many industrial applications including direct material processing and pumping fiber lasers and solid state lasers [1,2]. 915-nm broad-area laser diodes
Autor:
Takenori Morita, Yuta Aoki, Hirofumi Miyajima, Takehito Nagakura, Akira Higuchi, Masahiro Miyamoto, Harumasa Yoshida, Hideyuki Naito, Kousuke Torii, Junya Maeda
Publikováno v:
SPIE Proceedings.
Vertical-Cavity Surface-Emitting Lasers (VCSELs) are very attractive to high power light sources owing to the advantageous configuration of two-dimensional arrays and being free from catastrophic optical damage. Although oxideconfined VCSELs have bee
Autor:
Junya Maeda, Yuta Aoki, Takenori Morita, Hirofumi Miyajima, Takehito Nagakura, Hideyuki Naito, Kousuke Torii, Akira Higuchi, Harumasa Yoshida, Masahiro Miyamoto
Publikováno v:
SPIE Newsroom.
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