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15 October 2003 Effects of forged stock on cryogenic performance of heat-treated aluminum mirrors
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We present the results of an on-going test program designed to empirically determine the effects of different stress relief procedures for aluminum mirrors. Earlier test results identified a preferred heat treatment for flat and spherical mirrors diamond turned from blanks cut out of Al 6061-T651 plate stock. Further tests were performed on mirrors from forged stock to measure the effect of this variable on cryogenic performance. The mirrors are tested for figure error and radius of curvature at room temperature and at 80 K for at least three thermal cycles. We correlate the results of our optical testing with heat treatment and metallographic data.
© (2003) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ronald W. Toland, Raymond G. Ohl, Michael P. Barthelmy, Said Wahid Zewari, Matthew A. Greenhouse, and John W. MacKenty "Effects of forged stock on cryogenic performance of heat-treated aluminum mirrors", Proc. SPIE 5172, Cryogenic Optical Systems and Instruments X, (15 October 2003);

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