title: Pump-intensity-dependent frequency shift in Stokes and anti-Stokes spectra generated by stimulated four-photon mixing in birefringent fiber.
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-H(z)Q-switched Nd:YAG laser (lambda = 1.0642microm) 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.
authors.forename: H G
authors.initials: HG
authors.lastname: Park
authors.forename: J D
authors.initials: JD
authors.lastname: Park
authors.forename: S S
authors.initials: SS
authors.lastname: Lee