High transmission, low pass scatter filters for blocking at wavelengths from 3.5 microm to 50 microm and singlelayer antireflection coatings for optical materials used in the 25-microm-300microm region of the spectrum are described. The application of both techniques to liquid-He-cooled filters permits the construction of efficient low pass and medium-width band pass filters for use throughout the far infrared.
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Armstrong et al. (1974) studied this question.
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