Abstract
The experimental investigation of the temperature dependence of spectra of spontaneous Raman light scattering on polaritons in α-LiJO 3 crystal has been carried out. An anomalous broadening of the frequency-angular spectrum of scattered radiation was found in the region of phase transition α→γ→β at 256°C. It is assumed that this phenomenon is due to an anomalous increase of non-linearity of the third order and, hence, of the probability of the four-particle scattering process at which a pumping photon is decayed into a photon and two polaritons during a common act.
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