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Optica Publishing Group
  • Conference on Lasers and Electro-Optics
  • OSA Technical Digest (Optica Publishing Group, 1991),
  • paper CTuJ2

Theory of semiconductor laser feedback instability

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Abstract

We have theoretically investigated a semiconductor laser coupled to an external cavity through one of its mirrors, as sketched in Fig. 1. In our model, the end mirrors are assumed to be perfectly reflecting, whereas the coupling mirror has a finite transmission. The losses are assumed to be distributed over the entire cavity. The equation for the electromagnetic field inside the cavity is obtained from Maxwell's equations in which the polarization contribution is calculated microscopically in the quasiequilibrium, free-particle approximation for the excited electrons and holes.1 From the expression for the polarization, we extract gain and refractive-index changes as functions of carrier density. The total density of the electron-hole pairs obeys a rate equation, in which the relaxation is described by a simple exponential process, and constant pumping is assumed.

© 1991 Optical Society of America

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