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Title: Interband cascade lasers with >40% continuous-wave wallplug efficiency at cryogenic temperatures

Broad-area 10-stage interband cascade lasers (ICLs) emitting at λ = 3.0–3.2 μm are shown to maintain continuous-wave (cw) wallplug efficiencies exceeding 40% at temperatures up to 125 K, despite having a design optimized for operation at ambient and above. The cw threshold current density at 80 K is only 11 A/cm{sup 2} for a 2 mm cavity with anti-reflection/high-reflection coatings on the two facets. The external differential quantum efficiency for a 1-mm-long cavity with the same coatings is 70% per stage at 80 K, and still above 65% at 150 K. The results demonstrate that at cryogenic temperatures, where free carrier absorption losses are minimized, ICLs can convert electrical to optical energy nearly as efficiently as the best specially designed intersubband-based quantum cascade lasers.
Authors:
; ; ; ; ;  [1] ;  [2]
  1. Code 5613, Naval Research Laboratory, Washington, DC 20375 (United States)
  2. Sotera Defense Solutions, Inc., 7230 Lee DeForest Drive, Suite 100, Columbia, Maryland 21046 (United States)
Publication Date:
OSTI Identifier:
22482108
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 12; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ABSORPTION; CARRIERS; CAVITIES; COATINGS; LASERS; LOSSES; OPERATION; QUANTUM EFFICIENCY; REFLECTION; THRESHOLD CURRENT