Measurements of the thermal expansion of six optical materials, from room temperature to 250°C
- 1 April 1978
- journal article
- Published by Optica Publishing Group in Applied Optics
- Vol. 17 (7) , 1152-1154
- https://doi.org/10.1364/ao.17.001152
Abstract
Coefficients of linear thermal expansion are reported in the range from room temperature to 250°C for six optical materials: Polytran potassium chloride and Polytran calcium fluoride—Harshaw; chemical-vapor-deposited (CVD) zinc selenide and zinc sulfide—Raytheon; single-crystal germanium—Eagle-Picher; and lithium niobate—Harshaw. For the last named, an anisotropic crystal, thermal expansion was measured both parallel and perpendicular to the c axis. Curves are given to illustrate the expansion behavior of the materials over the 60–500-K range.Keywords
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