Abstract

We describe a low-pass filter that provides high in-band transmittance and excellent rejection at ν > 100 cm−1. The transmittance of the filter components was measured at liquid-helium temperatures from 10 to 10,000 cm−1. The total transmittance is >50% for ν < 50 cm−1 and is calculated to be <10−9 for ν > 300 cm−1. The filter was successfully used in a liquid-helium-cooled, rocketborne, far-infrared absolute photometer.

© 1995 Optical Society of America

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