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Four-wave mixing (FWM) in semiconductor laser amplifiers (SLA) has been studied extensively in recent years,1-3 An arrangement often investigated in theory and experiment is as follows: Two optical fields, a strong pump wave (frequency fp) and a weaker signal wave (frequency fs) are coupled into a SLA. Beating of both fields leads to modulation of various parameters of the gain medium at the beat frequency Δf = fp− fs (and multiples of Δf), which causes a dynamical index and gain grating and the generation of new waves. Also associated with FWM is the asymmetric nonlinear gain around the strong pump wave. It causes an asymmetry of the signal output power against the sign of Δf. This asymmetry was theoretically predicted by Bogatov et al.4
© 1995 Optical Society of America
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