Abstract
The article examines the dispersion law of polariton waves in terbium nitrate hydrate crystals. We have calculated the values of the unitary polaritons frequencies corresponding to the refractive index equal to unit as well as the velocity and the effective mass of the unitary polaritons. The diagram of terms splitting in the low symmetric crystalline field is constructed. It is shown that the abnormal decrease of the polariton waves’ group velocity occurs due to the splitting of the terbium ions spectral terms in the crystalline field. We consider the conditions for the essential increase of the photoluminescence intensity and decrease of the lasing threshold in terbium nitrate hydrate crystals.
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