On the dispersion of optical and electro-optical coefficients in zinc telluride

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Abstract
A technique is described for measurement of Pockels' coefficient in crystals over a wide optical frequency range, and the results are given of a set of measurements made on the semiconducting material zinc telluride. It is shown that the results, together with measurements made here and elsewhere of the linear optical coefficients (refractive index and absorption coefficient), can be interpreted by means of a simplified model in which quantum-mechanical expressions for optical polarizability are integrated over absorption bands in the visible and ultra-violet regions. In particular, the visible absorption band is found to play an important part in the derivation of the non-linear (Pockels) coefficient, although contributing very little to the linear refractive index, which derives mainly from absorption bands in the ultra-violet.

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