Abstract

In a continuing study of the physical properties of optical materials, measurements are reported of the linear thermal expansion coefficients for four ir-transmitting materials in the temperature range 10–300 K. A new glass and three polycrystalline materials were investigated by use of a three-terminal capacitance-type dilatometer incorporated into a cryostat. The glass, designated No. 20 by Texas Instruments, Inc., is a nonoxide chalcogenide glass with the composition Ge₃₃Se₅₅As₁₂. One of the polycrystalline materials studied, T-12 (Harshaw Chemical Co.), is an optically integral two-phase material composed of equal molar proportions of CaF₂ and BaF₂. The other two materials are microcrystalline, hot-pressed forms of CdS and CdTe (Irtran 6), manufactured by the Eastman Kodak Co.

© 1972 Optical Society of America

Low Temperature Thermal Expansion Measurements on Optical Materials

James Steve Browder and Stanley S. Ballard
Appl. Opt. 8(4) 793-798 (1969)

Measurements of the thermal expansion of six optical materials, from room temperature to 250°C

Stanley S. Ballard, Stephen E. Brown, and James Steve Browder
Appl. Opt. 17(7) 1152-1154 (1978)

Apparatus for Measuring the Thermal Expansion of Optical Materials from 30°C to 250°C

John F. Ebersole, Stanley S. Ballard, and James Steve Browder
Appl. Opt. 11(4) 844-848 (1972)

Thermal expansion data for eight optical materials from 60 K to 300 K

James Steve Browder and Stanley S. Ballard
Appl. Opt. 16(12) 3214-3217 (1977)

Thermal Expansion and Other Physical Properties of the Newer Infrared-Transmitting Optical Materials

Stanley S. Ballard and James Steve Browder
Appl. Opt. 5(12) 1873-1876 (1966)