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Title: Continuous wave operation of quantum cascade lasers with frequency-shifted feedback

Operation of continuous wave quantum cascade lasers with a frequency-shifted feedback provided by an acousto-optic modulator is reported. Measured linewidth of 1.7 cm{sup −1} for these devices, under CW operating conditions, was in a good agreement with predictions of a model based on frequency-shifted feedback seeded by spontaneous emission. Linewidth broadening was observed for short sweep times, consistent with sound wave grating period variation across the illuminated area on the acousto-optic modulator. Standoff detection capability of the AOM-based QCL setup was demonstrated for several solid materials.
Authors:
 [1] ;  [2] ;  [2] ; ; ; ; ;  [1]
  1. Pranalytica, Inc., 1101 Colorado Ave., Santa Monica, CA 90401 (United States)
  2. (United States)
Publication Date:
OSTI Identifier:
22492418
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Advances; Journal Volume: 6; Journal Issue: 1; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ACOUSTICS; DETECTION; EMISSION; FEEDBACK; LASERS; LINE WIDTHS; OPERATION; OPTICS; SOLIDS; SOUND WAVES; VARIATIONS