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

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