Abstract

A sample of Irtran 6 (hot-pressed, microcrystalline compacted cadmium telluride) was formed into a prism. The refractive index was measured by a modification of the minimum-deviation technique that allows the orientation of the prism to remain fixed throughout an entire set of measurements. Thus, refractive-index differences can be measured rapidly under quasi-equilibrium conditions, while the temperature of the sample is being slowly varied through the desired temperature range. Accuracies of about one part in the fourth decimal place are obtained with this technique. The sample was mounted in a Dewar flask and its index of refraction was measured as a function of wavelength, from 2 to 30 μm, at two fixed temperatures. It was also measured as a function of temperature, from 80 to 300 K, at several fixed wavelengths. Results in the form of refractive index versus temperature and wavelength are presented, as well as values of dn/dT as a function of wavelength and temperature.

© 1975 Optical Society of America

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