The realization of filters containing PbTe and various II-VI materials to an optimum performance is described. In the pass-band, transmission is optimum due to the use of the Tschebysheff equal-ripple design concept; in the stopping bands, performance is optimum due to PbTe photoconductive absorption (low-pass) and II-VI reststrahl absorption (high-pass). Two example filters are discussed in detail: a cut-on/cut-off filter for the 668 cm -1 v 2 band of CO 2 useful in space research and a long-wave blocking filter cutting on a 490 cm -1 useful in infrared grating spectrophotometers.
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Evans et al. (1976) studied this question.