Stacking-layer-number dependence of highly stacked InAs quantum dot laser diodes fabricated using strain-compensation technique

Kouichi Akahane*, Naokatsu Yamamoto, Tetsuya Kawanishi, Sergio Bietti, Ayami Takata, Yoshitaka Okada

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution


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.

Original languageEnglish
Title of host publicationNovel In-Plane Semiconductor Lasers XI
Publication statusPublished - 2012 Mar 1
Externally publishedYes
EventNovel In-Plane Semiconductor Lasers XI - San Francisco, CA, United States
Duration: 2012 Jan 232012 Jan 26

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


OtherNovel In-Plane Semiconductor Lasers XI
Country/TerritoryUnited States
CitySan Francisco, CA


  • Highly stacking
  • Quantum dot
  • Semiconductor laser
  • Strain-compensation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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