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Simple Analytical Approximations for the Gain and Refractive Index Spectra in Quantum-Well Lasers

Balle, Salvador
Physical Review A 57, 1304-1312 (1998)

An analytical expression for the low-temperature optical susceptibility of
Quantum-Well semiconductor lasers is presented based on a simple parabolic
band model. The optical susceptibility obtained keeps the nonlinear
dependence on the carrier density, providing both a broad gain spectrum and a
dispersion curve, so it can be used to analyze the dynamics of multimode
devices or devices with large carrier density variations. The resulting peak
gain, differential peak gain and linewidth enhancement factor are discussed.
CW operation of a single-mode laser is studied as a function of the frequency
of the cavity resonance.

(Postscript file, 28 pages)