Abstract

A simple method for measuring refractive index in the infrared is described. It uses autocollimation from the front surface of a prism and requires only that the receiver be moved to measure a new deviated ray when either the wavelength of the source or the temperature of the sample is changed. An error analysis that includes consideration of the evacuated sample space and wedge in the chamber windows shows that errors as low as one part in the fourth decimal place can be obtained.

© 1975 Optical Society of America

Rapid and Accurate Measurements of Refractive Index in the Infrared*

E. D. McAlister, J. J. Villa, and C. D. Salzberg
J. Opt. Soc. Am. 46(7) 485-487 (1956)

Refractive index of Irtran 6 (hot-pressed cadmium telluride) as a function of wavelength and temperature

J. E. Harvey and William L. Wolfe
J. Opt. Soc. Am. 65(11) 1267-1268 (1975)

Technique for Measuring Refractive Index Changes in Photochromic Materials

W. J. Tomlinson and G. D. Aumiller
Appl. Opt. 14(5) 1100-1104 (1975)

Refractive Index Measurement of High Refractive Index Glass Beads

Takeshi Yamaguchi
Appl. Opt. 14(5) 1111-1115 (1975)

Large refractive-index change in PbI₂ films by photolysis at 150–180 °C*

A. B. Buckman, N. H. Hong, and D. Wilson
J. Opt. Soc. Am. 65(8) 914-918 (1975)