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Proceedings Paper

Stacking-layer-number dependence of highly stacked InAs quantum dot laser diodes fabricated using strain-compensation technique
Author(s): Kouichi Akahane; Naokatsu Yamamoto; Tetsuya Kawanishi; Sergio Bietti; Ayami Takata; Yoshitaka Okada
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Paper Abstract

Semiconductor quantum dots (QDs) grown using self-assembly techniques in the Stranski- Krastanov (S-K) mode are expected to be useful for high-performance optical devices such as QD lasers. A significant amount of research has been carried out on the development of highperformance QD lasers because they offer the advantages of a low threshold current, temperature stability, high modulation bandwidth, and low chirp. To realize these high-performance devices, the surface QD density should be increased by fabricating a stacked structure. We have developed a growth method based on a strain-compensation technique that enables the fabrication of a high number of stacked InAs QD layers on an InP(311)B substrate. In this study, we employed the proposed method to fabricate QD laser diodes consisting of highly stacked QD layers and investigated the dependence of the diode parameters on the stacking layer number. We fabricated QD laser diodes with 5, 10, 15, and 20 QD layers in the active region. All of the laser diodes operated at around 1.55 μm at room temperature, and their threshold currents showed clear dependence on the stacking layer number. Laser diodes with more than 10 QD layers showed sufficient gain, i.e., the threshold currents decreased with a decrease in the cavity length. On the other hand, for laser diodes with less than 10 QD layers, the threshold currents increased with a decrease in the cavity length.

Paper Details

Date Published: 9 February 2012
PDF: 7 pages
Proc. SPIE 8277, Novel In-Plane Semiconductor Lasers XI, 827703 (9 February 2012); doi: 10.1117/12.907533
Show Author Affiliations
Kouichi Akahane, National Institute of Information and Communications Technology (Japan)
Naokatsu Yamamoto, National Institute of Information and Communications Technology (Japan)
Tetsuya Kawanishi, National Institute of Information and Communications Technology (Japan)
Sergio Bietti, National Institute of Information and Communications Technology (Japan)
Univ. degli Studi di Milano-Bicocca (Italy)
Ayami Takata, National Institute of Information and Communications Technology (Japan)
The Univ. of Tokyo (Japan)
Yoshitaka Okada, The Univ. of Tokyo (Japan)


Published in SPIE Proceedings Vol. 8277:
Novel In-Plane Semiconductor Lasers XI
Alexey A. Belyanin; Peter M. Smowton, Editor(s)

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