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
Original Manuscript: December 3, 1976
Published: November 1, 1977
John Fontanella, Richard L. Johnston, Jack H. Colwell, and Carl Andeen, "Temperature and pressure variation of the refractive index of diamond," Appl. Opt. 16, 2949-2951 (1977)