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Opt Express. 2006 Apr 3;14(7):2950-5.

The linewidth enhancement factor alpha of quantum dot semiconductor lasers.


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.

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