Abstract
Abstract In this Letter we show that the power of stimulated Rayleigh wing scattering (SRWS) generated in bulk liquid of anisotropic molecules is reduced by a simultaneous presence of stimulated four-photon interaction (SFPI) because the combined effect of SRWS and SFPI results in a walk-off between the pump beam and the generated signal in the nonguided system and this shortens the nonlinear interaction length. The SRWS may be greatly enhanced in a hollow waveguide filled with a liquid of higher index of refraction than that of the waveguide cladding as the long interaction length is maintained for the whole length of the waveguide. The enhanced SRWS results in a considerable red-shifted frequency super-broadening of an intense optical pulse that passes through the waveguide, and which can be experimentally observed.
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