Zobrazeno 1 - 9
of 9
pro vyhledávání: '"HIROKI AOSHIMA"'
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:
Shun Ito, Kenichiro Takeda, Hiroki Aoshima, Isamu Akasaki, Satoshi Kamiyama, Mikiko Mori, Motoaki Iwaya, Kosuke Takehara, Hiroshi Amano, Tetsuya Takeuchi
Publikováno v:
physica status solidi c. 9:753-756
We report on laser lift-off (LLO) of AlN/sapphire for UV light-emitting diodes (LEDs). Underfill between chip and submount is a key factor for the successful LLO of AlN/sapphire. We fabricated thin-film-flip-chip UV LEDs with a peak wavelength of 343
Autor:
Motoaki Iwaya, Isamu Akasaki, Satoshi Kamiyama, Kosuke Takehara, Hiroshi Amano, Shun Ito, Hiroki Aoshima, Tetsuya Takeuchi, Kenichiro Takeda, Kengo Nagata
Publikováno v:
physica status solidi c. 9:519-522
The crystalline quality of GaN and Al0.08Ga0.92N epitaxial layers on (100) β-Ga2O3 substrates was significantly improved by the facet-controlled growth method. The facets were controlled by changing the nitrogen ambient thermal annealing temperature
Autor:
Yoshinori Oshimura, Motoaki Iwaya, Hiroshi Amano, Kengo Nagata, Kenichiro Takeda, Tetsuya Takeuchi, Hirofumi Kan, Isamu Akasaki, Satoshi Kamiyama, Kosuke Takehara, Hiroki Aoshima, Yoji Yamashita, Masakazu Kuwabara, Harumasa Yoshida, Shun Ito
Publikováno v:
physica status solidi c. 8:2384-2386
We evaluated AlGaN-based 355 nm UV laser diodes prepared under two different Mg activation conditions. The annealing processes for Mg activation in p-layers were carried out under N2 or O2 ambient to investigate the effect of the ambient gas on the l
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:
Kosuke Takehara, Kenichiro Takeda, Shun Ito, Hiroki Aoshima, Motoaki Iwaya, Tetsuya Takeuchi, Satoshi Kamiyama, Isamu Akasaki, Hiroshi Amano
Publikováno v:
Japanese Journal of Applied Physics. 51:042101
Autor:
Kenichiro Takeda, Hiroki Aoshima, Satoshi Kamiyama, Hiroshi Amano, Shun Ito, Tetsuya Takeuchi, Motoaki Iwaya, Kosuke Takehara, Isamu Akasaki
Publikováno v:
Japanese Journal of Applied Physics. 51:042101
We investigated indium–tin oxide (ITO)/Al reflective electrodes for improving the light extraction efficiency of UV light-emitting diodes (LEDs). The ITO layer showed high transparency in the UV region upon optimization of the thickness and anneali
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