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14 October 1996 Cryogenic test of an all-aluminum infrared optical system
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An all aluminum reflective optical system was tested to evaluate its optical performances at near liquid nitrogen temperature. A special cryogenic dewar was designed and fabricated with an optical window made of quartz glass on the front wall of the dewar. The optical system under test and a reference plane mirror, which were mounted into the dewar and cooled by liquid nitrogen, formed a double pass interferometric test schema together with a He-Ne interferometer of Fizeau type outside the dewar. The test results showed that there was little differences between the wavefront errors before and after the optical system is cooled, and in both cases the optical system had a diffraction limited imaging quality.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Mangzuo Shen, Xiangdi Lin, Wenli Ma, Sheng Liao, and Xiaohong Zhang "Cryogenic test of an all-aluminum infrared optical system", Proc. SPIE 2814, Cryogenic Optical Systems and Instruments VII, (14 October 1996);

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