NASA NTRS · 19730055325
New techniques for far-infrared filters.
Abstract
The techniques considered make it possible to construct high performance low-pass wide-band, and medium-band filters at wavelengths in the range from 25 to 300 micrometers. Short wavelength rejection without appreciable loss at long wavelengths is achieved by means of small particle scattering. Spectral definition in the far infrared is obtained by cooling one or more crystalline materials to liquid-He or liquid-nitrogen temperatures. The problem of reflection losses at the various surfaces is solved by a new antireflection coating technique.
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Armstrong, K. R., Low, F. J.. 1973-09-01. New techniques for far-infrared filters.. https://ntrs.nasa.gov/citations/19730055325
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