Abstract

We demonstrate measurements of the α 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 α factor on the injection current, ranging from 0.44 at 120mA to 2.29 at 180mA, which can be attributed to the inherent physics of QCLs.

© 2006 Optical Society of America

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