A many-body theory for the electron-hole plasma in a semiconductor laser is presented and evaluated for 3-D bulk semiconductors and quasi-2-D quantum well structures. Starting from the generalized semiconductor Bloch equations1 and using a Pade approximation for the optical susceptibility,2 gain/absorption and refractive index spectra are computed which clearly show the effects of Coulomb enhancement, bandgap renormalization, broadening, and plasma screening.3

© 1989 Optical Society of America

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