Abstract
The linewidth enhancement factor (α–factor), defined as the ratio of carrier-induced variation of real and imaginary parts of the material’s susceptibility, has a great importance for semiconductor lasers, as it influences linewidth, chirp, mode stability, laser dynamics, laser behavior in presence of optical feedback. Given that a low value for the α–factor is considered good, Quantum-Dot lasers (QDLs) are particularly interesting as they should exhibit a near-zero value for the α–factor, thanks to their atom-like transition [1]. However, measured values for QDLs range from almost zero to more than 10 [1,2], i.e., a range that extends well beyond the natural discrepancies that are expected when different measuring methods are applied.
© 2013 IEEE
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