Abstract
The output spectra of the Stokes and anti-Stokes fields generated by stimulated four-photon mixing in birefringent fiber are investigated both experimentally and theoretically and are found to be dependent on the pump intensity. The pump-intensity-dependent changes in their frequency shifts are measured in 15-m long birefringent fiber by time-resolved spectroscopy using a 500-Hz Q-switched Nd:YAG laser (λ = 1.0642 μm) as the pump source. Also, the Stokes gain coefficient is calculated as a function of the frequency shift and the pump power for the present phase-matching process where the mutually perpendicular polarization components are involved. The theoretical results agree well with the experimental data obtained.
© 1987 Optical Society of America
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