The reflection and transmission of fifteen commonly used infrared optical materials have been measured to 50 μ with a Beckman IR-7 with CsI optics. Using these reflection properties, small inexpensive reststrahlen filters have been constructed. By applying a fine grind to reststrahlen plates, it is shown that stray light can be reduced in far-infrared instruments.
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Donald E. McCarthy (1963) studied this question.