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Measurements of the alpha factor of a distributed-feedback quantum cascade laser by an optical feedback self-mixing technique

Messung des alpha-Faktors eines DFB Quantenkaskadenlasers mittels Rückkopplungsinterferometrie
 
: Staden, J. von; Gensty, T.; Elsässer, W.; Giuliani, G.; Mann, C.

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Optics Letters 31 (2006), Nr.17, S.2574-2576
ISSN: 0146-9592
Englisch
Zeitschriftenaufsatz
Fraunhofer IAF ()
alpha-factor; quantum cascade laser; Alpha-Faktor; Quantenkaskadenlaser

Abstract
We demonstrate measurements of the alpha factor of a distributed-feedback quantum cascade laser (QCL) by using a newly modified self-mixing interferometric technique exploring the laser itself as the detector. We find a strong dependence of the alpha factor on the injection current, ranging from -0.44 at 120 mA to 2.29 at 180 mA, which can be attributed to the inherent physics of QCLs.

: http://publica.fraunhofer.de/dokumente/N-49566.html