Abstract

The temperature and pressure variations of the refractive index for a Type IIa diamond have been measured at audio frequencies using capacitance techniques. Measurements have been made at zero pressure over the 5.5–340-K temperature range and at pressures up to 1.4 × 108 Pa (1.4 kbar) at room temperature. At room temperature, (1/n)(dn/dT)p = +4.04 × 10−6/K and (1/n)(dn/dp)T = −0.36 × 10−12/Pa. In addition, the curvature in the refractive index with temperature has been determined. The first-order derivatives are compared with previous experimental data and the recent theoretical calculations of Van Vechten and Yu and Cardona.

© 1977 Optical Society of America

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