The Frustrated Total Reflection filter is a transmission band pass filter. It can be constructed for any part of the spectrum for which there exist transparent materials of different indices of refraction. Measurements are shown of a filter which was designed for the rocksalt infra-red region. This filter has two oppositely polarized pass bands which, at a particular angle of incidence, are at 412 and 5 microns, respectively. Both the pass bands are approximately 110 of a micron wide. They can be shifted over a range of approximately half a micron by tilting the filter.
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Billings et al. (1949) studied this question.
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