Abstract
Measurements have been made of various physical properties of certain optical materials of interest in infrared instrumentation. Tables are included which list values of Young’s modulus, apparent elastic limit, modulus of rupture, modulus of rigidity, hardness, and linear coefficient of thermal expansion. Major data are reported on the following crystals: silver chloride, thallium bromide-iodide, thallium bromide-chloride, sodium chloride, potassium chloride, potassium bromide, lithium fluoride, and calcium fluoride. Some data are also given for a dozen-odd other optical materials. Literature values of elastic coefficients are stated for comparison, as well as the values of Young’s modulus and modulus of rigidity calculated from these coefficients. A brief discussion is given of the variation of the elastic moduli with direction in the crystal, for cubic crystals.
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