Microscopic theory of spatiotemporal multiwave mixing in broad-area semiconductor laser amplifliers

We investigate the interplay of multiwave-mixing processes with the microsc opically coupled spatiotemporal light held and charge carrier dynamics in b road-area semiconductor laser amplifiers. Our theoretical description is ba sed on extended spatially resolved Maxwell-Bloch equations including on the microscopic level spatiotemporal multiwave-mixing processes. Performing a third-order expansion in terms of the microscopic carrier distribution, we include in our description both the effects of population pulsations of the total carrier density at the beat frequency and the spatiospectral interac tions of the Light fields leading to gain nonlinearities as well as spatial and spectral hole burning. Our simulations show that in a broad-area semic onductor laser amplifier, spatiotemporal wave-mixing processes occur in bot h transverse and propagation directions of the multifrequency optical beams employed in a typical excite-probe configuration. [S1050-2947(99)05312-3].