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K. R. ALLAKWERDIEV e t al. : Measurement of the Refractive Indices 309 phys. stat. sol. (a) 60,309 (1980) Subject classification: 20.1; 22.8 lnstitute of Physics, Academy of Sciences of the Azerbaidzhan SSR, B a k d ) (a) and P . N . Lebedev Physieal Institute, Academy of Sciences of the USSR, Moscow2) (b)A method of determining the refractive indices of the ordinary (no) and extraordinary (n,) rays in crystals with layered type structure are described. The refractive indices of layered CdInGaS, and TlInS, are measured using this technique with the help of laser radiation source at 0.63, 1.15, and 3.39 pm. The experimentally obtained values of no and n, are extrapolated from 0.6 to 4.0 pm I) Prospect Narimanova 33, Baku, USSR. 2, Lenin prospect 53, iVIoscow W 333, USSR.