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Measurements of the alpha factor of a distributed-feedback quantum cascade laser by an optical feedback self-mixing
Jens von Staden1, Tobias Gensty, Wolfgang Elsässer
1Institute of Applied Phsyics, Darmstadt Univeristy of Technology, Schlossgartenstrasse 7, Darmstadt, Germany. jens.von.staden@physik.tu-darmstadt.de
Optics Letters
|August 12, 2006
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.
