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The linewidth enhancement factor α of quantum dot semiconductor lasers

2006; Optica Publishing Group; Volume: 14; Issue: 7 Linguagem: Inglês

10.1364/oe.14.002950

1094-4087

Sergey Melnik, G. Huyet, Alexander V. Uskov,

Semiconductor Quantum Structures and Devices

We show that the various techniques commonly used to measure the linewidth enhancement factor can lead to different values when applied to quantum dot semiconductor lasers. Such behaviour is a direct consequence of the intrinsic capture/escape dynamics of quantum dot materials and of the free carrier plasma effects. This provides an explanation for the wide range of values experimentally measured and the linewidth re-broadening recently measured.