4.4 Article

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

Journal

AIP ADVANCES
Volume 6, Issue 1, Pages -

Publisher

AMER INST PHYSICS
DOI: 10.1063/1.4940767

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Funding

  1. Direction Generale de l'Armement (DGA)
  2. COST Action [MP2014]

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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 degrees 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. (C) 2016 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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