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VOLUME 39 (1984) | ISSUE 8 | PAGE 366
Direct observation of two polariton waves near the main exciton resonance in CdS crystals
The dispersion of the index of refraction in the region of excitonic resonances at T= 1.8 К is investigated using the refraction of light by a thin CdS crystal with refraction angle ~10~4 rad. The simultaneous transmission of two transverse E1C waves is observed above the frequency of the longitudinal AL exciton; the dispersion of the index of refraction and the spectral dependence of the transmission are measured for these waves. The basic parameters of the excitonic polaritons are determined.