Light weight silicon mirrors for space instrumentation | Zendy

Vincent T. Bly | Zendy; Peter C. Hill | Zendy; John G. Hagopian | Zendy; Carl R. Strojny | Zendy; Timothy M. Miller | Zendy

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Light weight silicon mirrors for space instrumentation

Author(s) -

Vincent T. Bly,

Peter C. Hill,

John G. Hagopian,

Carl R. Strojny,

Timothy M. Miller

Publication year - 2012

Publication title -

proceedings of spie, the international society for optical engineering/proceedings of spie

Language(s) - English

Resource type - Conference proceedings

SCImago Journal Rank - 0.192

H-Index - 176

eISSN - 1996-756X

pISSN - 0277-786X

DOI - 10.1117/12.929818

Subject(s) - polishing , materials science , silicon , optics , grinding , homogeneity (statistics) , distortion (music) , wafer , machining , optoelectronics , computer science , physics , composite material , amplifier , cmos , machine learning , metallurgy

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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