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Title: Long-infrared InAs-based quantum cascade lasers operating at 291 K (λ=19 μm) with metal-metal resonators

We demonstrate quantum cascade lasers in the InAs/AlSb material system emitting at wavelengths of λ = 19 μm and λ = 21 μm. The maximum operating temperatures are 291 K and 250 K, and the threshold current densities at 78 K are as low as 0.6 kA/cm{sup 2} and 1.3 kA/cm{sup 2} for the lasers emitting at λ = 19 μm and λ = 21 μm, respectively. These values represent the best performance to date for quantum cascade lasers operating above λ = 16 μm. Although the devices employ metal-metal waveguide geometries, the diffraction effects which typically hinder the output beam of THz devices are not observed.
Authors:
; ; ;  [1] ; ; ; ; ;  [2]
  1. Institut d'Electronique Fondamentale, Univ. Paris Sud, UMR 8622 CNRS, 91405 Orsay (France)
  2. Institut d'Electronique du Sud, Univ. Montpellier 2, UMR 5214 CNRS, 34095 Montpellier (France)
Publication Date:
OSTI Identifier:
22275792
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 2; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM; ANTIMONY; DIFFRACTION; INDIUM ARSENIDES; LASERS; RESONATORS; THRESHOLD CURRENT