11 October 2012 Light weight silicon mirrors for space instrumentation
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Abstract
Each mirror produced by this NASA developed process is a monolithic structure from a single crystal of silicon. Due to single crystal silicon's extraordinary homogeneity and lack of internal stress, we light weight after optical polishing. Mirrors produced by our original process were about 1/4th the mass of an equivalent quartz mirror and were typically 1/50th wave or better. We have recently revised our process, replacing the isogrid structures with ones optimized to minimize distortion due to mounting errors. We have also switched from ultrasonic machining to CNC grinding to enable the production of larger mirrors. We report results to date for mirrors produced by the revised process and cryogenic test results for an ultrasonically light weighted mirror.
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Vincent T. Bly, Vincent T. Bly, Peter C. Hill, Peter C. Hill, John G. Hagopian, John G. Hagopian, Carl R. Strojny, Carl R. Strojny, Timothy M. Miller, Timothy M. Miller, } "Light weight silicon mirrors for space instrumentation", Proc. SPIE 8486, Current Developments in Lens Design and Optical Engineering XIII, 84860P (11 October 2012); doi: 10.1117/12.929818; https://doi.org/10.1117/12.929818
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