Abstract
We consider the cascaded part of coherent four-wave Raman scattering in crystals without inversion symmetry as a method of spectroscopy of phonon polaritons. The theory of this effect is developed accounting for the limited dimensions of the scattering area and imaginary character of the non-linear susceptibilities. The experimental results for four-wave cascaded scattering by polaritons in crystals of LiIO3, LiNbO3 : Mg and LiNbO3 : Mg : Nd are presented. The effect of narrowing of the polariton lineshape is observed in doped LiNbO3 in the region of strong polariton absorption. The probable nature of the narrowing, connected with the excitation of the electronic states during the four-wave mixing, is discussed. Copyright © 2000 John Wiley & Sons, Ltd.
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