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Proceedings Paper

High-power operation of inner-stripe GaN-based blue-violet laser diodes
Author(s): Masaki Ohya; Kazuhisa Fukuda; Ichiro Masumoto; Shigeru Kohmoto; Koichi Naniwae; Mitsuki Yamada; Masahige Matsudate; Takumi Tsukuda; Takeshi Akagawa; Chiaki Sasaoka
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Paper Abstract

We review our recent progress in novel planar blue-violet laser diodes (BV-LDs). The planar BV-LDs are characterized by an inner-stripe waveguide formed with a buried AlN current-blocking layer and a wide regrown cladding layer that also acts as a current and heat spreader. These features enable high-power operation for BV-LDs thanks to their low electrical and low thermal resistance even with a narrow-stripe waveguide. In this paper, we report successful demonstration of the planar inner-stripe BV-LDs by utilizing low-temperature-grown AlN and the regrown cladding layer. Low electrical resistance of the regrown cladding layer was confirmed by scanning spread resistance microscopy. Heat spreading characteristics were also investigated by 2-dimensional thermal simulation. The fabricated BV-LDs with a 1.4-&mgr;m-wide stripe achieved a low threshold current of 32 mA, a low threshold voltage of 4.1 V and greater than 200- mW kink-free output power under CW operation. Moreover, the kink-free output level surpassed 1,000 mW for the 1.0- &mgr;m stripe BV-LDs under 0.03%-duty-pulsed operation. The BV-LDs operated stably for more than 1,000 hours at a high output power of 200 mW at 80oC under a 50%-duty-pulsed condition. After the reliability test, transmission electron microscopy revealed no defect near the regrown interface of the tested LDs.

Paper Details

Date Published: 8 February 2007
PDF: 9 pages
Proc. SPIE 6485, Novel In-Plane Semiconductor Lasers VI, 648505 (8 February 2007); doi: 10.1117/12.714209
Show Author Affiliations
Masaki Ohya, NEC Corp. (Japan)
Kazuhisa Fukuda, NEC Corp. (Japan)
Ichiro Masumoto, NEC Corp. (Japan)
Shigeru Kohmoto, NEC Corp. (Japan)
Koichi Naniwae, NEC Corp. (Japan)
Mitsuki Yamada, NEC Corp. (Japan)
Masahige Matsudate, NEC Corp. (Japan)
Takumi Tsukuda, NEC Corp. (Japan)
Takeshi Akagawa, NEC Corp. (Japan)
Chiaki Sasaoka, NEC Corp. (Japan)


Published in SPIE Proceedings Vol. 6485:
Novel In-Plane Semiconductor Lasers VI
Carmen Mermelstein; David P. Bour, Editor(s)

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