A helium-cooled optical system for low-background measurements in the far infrared

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Abstract
This paper describes the construction and calibration of a complete optical system, built entirely within a standard helium cryostat, for making absolute measurements of radiation-induced luminescence and optical absorption in the infrared range out to 25 μ. Helium cooling the entire optical system reduced the thermal background radiation at the detector to approximately 1 × 109 photons/cm2-sec (λ<25 μ). Although helium Dewars for radiation effects have been described previously, to our knowledge no similar instrument for measuring radiation-induced optical effects has been reported.

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