Shortwave limit of infrared intersubband quantum cascade lasers

C. Z. Guo, S. L. Chen, Y. H. Zhang

Research output: Contribution to journalArticle

Abstract

The feasibility and fundamental difficulty in developing the infrared intersubband quantum cascade lasers in shorter wavelength range were discussed theoretically. The band offsets of InAs/AlSb on GaSb substrate, InAs/Al0.6Ga0.4Sb on GaSb substrate, and In0.53Ga0.47As/In0.52Al0.48As on InP substrate, and the confined states of their quantum wells with and without an applied electric field were analyzed and calculated by using the fundamental assumption of model-solid theory, strained band structure theory, empirical-two-band model for non-parabolic band, and methods of propagation matrix and laminar approach. It was found that the greatest energy difference between subband edges can not exceed 56-62% of the conduction band offset, and will be decreased further by the indirect valley. A designed structure of intersubband quantum cascade laser consisting of 250 coupled quantum wells in 25 periods under electric field 100 kV/cm for emitting the shortest wavelength 2.88 μm was proposed.

Original languageEnglish (US)
Pages (from-to)1-6
Number of pages6
JournalHongwai Yu Haomibo Xuebao/Journal of Infrared and Millimeter Waves
Volume20
Issue number1
StatePublished - Feb 1 2001
Externally publishedYes

Keywords

  • Band offset
  • Intersubband transition
  • Nonparabolic band
  • Quantum cascade laser

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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