Abstract

Coefficients of linear thermal expansion are reported, in the range 60 K to room temperature, for eight optical materials: Polytran potassium chloride and Polytran calcium fluoride—Harshaw; chemical-vapor-deposited (CVD) zinc sulfide and zinc selenide—Raytheon; germanium (single-crystal and polycrystal); crystalline magnesium fluoride, potassium dihydrogen phosphate (KDP), and lithium niobate—Harshaw. The last three are anisotropic crystals; thermal expansion was measured both parallel and perpendicular to the c axis.

© 1977 Optical Society of America

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