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Proceedings Paper

Measurement of the linewidth enhancement factor of quantum cascade lasers by the self-mixing technique
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Paper Abstract

We present measurements of the linewidth enhancement factor of a distributed feedback quantum cascade laser (DFB-QCL) using the so-called self-mixing technique. The linewidth enhancement factor is investigated by analyzing optical feedback induced changes of the emission properties of the laser. We will demonstrate that our self-mixing setup works well with QCLs in the mid infrared wavelength regime, and that it is possible to use the obtained signal to extract the linewidth enhancement factor. We present a setup that records the self-mixing signal with the voltage signal across the laser device using the laser as a detector itself. In this contribution we will show the advantages of this measurement technique. First measurements of the linewidth enhancement factor yield values that rise from 0.24 to 2.6 with an increase of the injection current of the QCL. We will discuss the influence of the injection current on the linewidth enhancement factor.

Paper Details

Date Published: 14 April 2006
PDF: 10 pages
Proc. SPIE 6184, Semiconductor Lasers and Laser Dynamics II, 61841E (14 April 2006); doi: 10.1117/12.662986
Show Author Affiliations
Jens von Staden, Darmstadt Univ. of Technology (Germany)
Tobias Gensty, Darmstadt Univ. of Technology (Germany)
Michael Peil, Darmstadt Univ. of Technology (Germany)
Wolfgang Elsäßer, Darmstadt Univ. of Technology (Germany)
Guido Giuliani, Univ. di Pavia (Italy)
Christian Mann, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)

Published in SPIE Proceedings Vol. 6184:
Semiconductor Lasers and Laser Dynamics II
Daan Lenstra; Markus Pessa; Ian H. White, Editor(s)

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