A low threshold current density InAs/AlGaSb superlattice quantum cascade laser operating at 14 μm

Keita Ohtani, Kazuue Fujita, Hideo Ohno

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

We report a low threshold current density InAs/AlGaSb superlattice quantum cascade laser operating at 14 μm. In order to reduce the threshold current density, InAs/AlGaSb superlattice structures providing large oscillator strength and fast carrier depopulation are used for the active layers. Observed threshold current density at 80 K is 0.92kA/cm2, which is about 5 times lower than that of the first InAs/AlSb quantum cascade laser reported earlier. This is among lowest threshold current density of quantum cascade lasers operating in the mid-infrared spectrum region.

Original languageEnglish
Pages (from-to)L879-L881
JournalJapanese Journal of Applied Physics, Part 2: Letters
Volume43
Issue number7 A
DOIs
Publication statusPublished - 2004 Jul 1

Keywords

  • AlGaSb
  • InAs
  • Molecular beam epitaxy
  • Quantum cascade laser
  • Superlattice

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)

Fingerprint

Dive into the research topics of 'A low threshold current density InAs/AlGaSb superlattice quantum cascade laser operating at 14 μm'. Together they form a unique fingerprint.

Cite this