Is there a linewidth theory for semiconductor lasers?

Details Is there a linewidth theory for semiconductor lasers? Is there a linewidth theory for semiconductor lasers?

2006-08-25

arxiv.org/abs/physics/0608260v1

Physics

Optics

Scientific paper

Semiconductor laser generation begins at a critical injection when the gain and loss spectra touch each other at a singular frequency. In the framework of the standard (Schawlow-Townes-Lax-Henry) theory, the finite linewidth results from the account of fluctuations associated with the random spontaneous emission processes. This approach is based on the assumption that in the mean-field approximation the singular frequency generation persists for injection levels higher than critical. We show that this assumption in the framework of the Boltzmann kinetic equation for electrons and photons is invalid and therefore the standard description of semiconductor laser linewidth lacks theoretical foundation. Experimental support of the standard theory is also questionable.

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