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Four-wave polariton scattering of light in LiNbO₃

G. Kh. Kitaeva, P. S. Losevski, A. A. Mikhalovski, and A. N. Penin

M. V. Lomonosov Moscow State University, 119899 Moscow, Russia

Four-wave Stokes k-spectra for light scattering on polaritons in lithium niobate crystals with an Mg impurity are studied experimentally. The mechanisms for direct, cascade, coherent, and incoherent four-wave mixing of light are discussed in the course of interpreting the angular dependences of the scattered light intensity. It is shown that the dispersion of the real part of the polariton wave vector and the refractive index of the crystals at the polariton frequencies can be measured with an order of magnitude greater accuracy than by spontaneous three-wave polariton light scattering. A significant discrepancy is found between determinations of the polariton absorption coefficient from the angular spectra of three-wave scattering and four-wave scattering in terms of the model employed here. ©1997 American Institute of Physics.

PII: S1063-7761(97)00408-3
doi:10.1134/1.558270
PACS: 42.70.Mp, 71.36.+c, 78.35.+c, 42.65.Hw, 78.20.Ci        Additional Information