Abstract

Extrapolation of PbTe/ii–vi multilayer interference-filter technique from 20 to beyond 40 μm is described and PbTe transparency reviewed; improvements below 20 μm are reported. A composite filter cutting on steeply at 40 μm is described that uses absorptive films of ZnS and As2S3, thin quartz, and supplementary multilayer interference. Absorptive filters are described containing the ii–vi compounds since these are found transparent at wavelengths shorter and longer than their reststrahl.

© 1981 Optical Society of America

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