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VOLUME 25 (1977) | ISSUE 5 | PAGE 240
Observation of interference of direct and cascade processes in active spectroscopy of polaritons
It is observed in experiment that the interference of threeand four-photon processes leads to deformation of the line shape and to the appearance of a doublet structure in the spectra obtained by active spectroscopy of Raman scattering of light by polaritons. The sign and the magnitude of the effective nonlinear susceptibility of third order χ^;^ 1.9X 10_i3 cgs esu are determined for the LiI03 crystal.