Abstract

The reststrahlen reflectance of crystalline materials can be enhanced with coatings of nonabsorbing interference films. At the same time the reflectance curve is altered to be nearly rectangular in shape as is more appropriate for infrared reflection filtering. The coatings consist of single films or are designed around symmetrical three- and five-film periods. PbCl2, ZnTe, and Ge were used for coatings on MgO, LiF, CaF2, and ZnO substrates as examples of reflection filters in the 14–36 μ infrared region.

© 1965 Optical Society of America

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