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A useful polarizer for the 6-μ to 20-μ region has been designed, fabricated, and tested. A microscopic wire grid was formed by ruling Irtran 2 (ZnS) or Irtran 4 (ZnSe) and evaporating aluminum preferentially on the groove tips. The average transmittance for the crossed polarizers in the 8-μ to 20-μ region was less than 1%. The degree of polarization was insensitive to a wide range of incidence angles. Data showing the spectral polarization efficiency as a function of wavelength are presented.
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Young et al. (1965) studied this question.
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