Refractive Index of ZnSe, ZnTe, and CdTe

Refractive indexes of ZnSe, ZnTe, and CdTe were obtained from prism refraction data and are reported for a series of wavelengths from 2.5 μ to the short-wave transmission limits set by the band gaps. The results were fitted with the standard formula: n2=A +[Bλ2/(λ2−c2)] where n is the refractive index and λ is the wavelength in microns. For ZnSe the best values of the parameters are A=4.00, B=1.90, and c2=0.113; for ZnTe, A=4.27, B=3.01, and c2=0.142; and for CdTe, A=5.68, B=1.53, and c2=0.366. Possible causes for the discrepancies between the present results and earlier data are discussed.