Abstract
This paper presents the results of measurements of the temperature dependence of the refractive indices of the ordinary and extraordinary rays (n<sub>o</sub>, n<sub>e</sub>) in the temperature interval 20-110 °C for various crystallographic directions of cadmium diphosphide. It is established that n<sub>o</sub> and n<sub>e</sub> increase with increasing temperature. It is shown that the temperature coefficient for n<sub>e</sub> depends on the direction of the laser beam relative to the crystal's optic axis, while it is independent for n<sub>o</sub>. The temperature-dependence curves of the refractive indices display a number of anomalies in the form of breaks caused by commensurate-incommensurate phase transitions.
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