Abstract

Transmission filters in the far-infrared region from 25 to 300 μ which cut off short-wave radiation are obtained from polyethylene sheet containing powders of reststrahlen crystals. The cut-off wavelength of these filters can be shifted with choice of restrahlen crystals. By using finer powder size and/or thinner polyethylene sheet, the steepness of the transmittance curve can be increased. These filters are very economical and convenient to use in far-infrared spectrometers.

© 1962 Optical Society of America

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