Abstract
The ordinary and the extraordinary refractive indices of CdI 2 , CdBr 2 and CdCl 2 single crystals have been measured at room and liquid nitrosen temperatures in the region from 7000 A to the shorter wavelength up to the absorption edge. The measurements have been carried out by an interference method in which both indices can be determined together with the thickness of the sample crystal. The results show birefringent optical characteristics or the negative crystal. The characteristics are interpreted in terms of dichroic absorption. The dispersion behavior of the indices in the energy region well below the absorption edge is analyzed using a single-effective-oscillator model.
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