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Title: Measurements of the linewidth enhancement factor of mid-infrared quantum cascade lasers by different optical feedback techniques

Precise knowledge of the linewidth enhancement factor of a semiconductor laser under actual operating conditions is of prime importance since this parameter dictates various phenomena such as linewidth broadening or optical nonlinearities enhancement. The above-threshold linewidth enhancement factor of a mid-infrared quantum cascade laser structure operated at 10{sup ∘}C is determined experimentally using two different methods based on optical feedback. Both Fabry-Perot and distributed feedback quantum cascade lasers based on the same active area design are studied, the former by following the wavelength shift as a function of the feedback strength and the latter by self-mixing interferometry. The results are consistent and unveil a clear pump current dependence of the linewidth enhancement factor, with values ranging from 0.8 to about 3.
Authors:
 [1] ;  [2] ; ; ;  [3] ;  [1] ;  [4] ;  [1] ;  [5]
  1. Université Paris-Saclay, Télécom ParisTech, CNRS LTCI, 46 rue Barrault, F-75013 Paris (France)
  2. (France)
  3. Technische Universität Darmstadt, Schlossgartenstr. 7, D-64289 Darmstadt (Germany)
  4. MirSense, 8 avenue de la Vauve, F-91120 Palaiseau (France)
  5. (United States)
Publication Date:
OSTI Identifier:
22492409
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; DESIGN; ELECTRIC CURRENTS; FABRY-PEROT INTERFEROMETER; FEEDBACK; INTERFEROMETRY; LINE WIDTHS; NONLINEAR PROBLEMS; SEMICONDUCTOR LASERS; WAVELENGTHS