19 May 2003 Light weight mirrors from single crystal silicon
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Abstract
We describe a process for fabricating light weight mirrors from single crystal silicon. The process uses conventional fabrication techniques in an unconventional sequence. The optical surface is ground and polished before light weighting. Distortion is minimized due to the crystalline nature of the material. A final trim polishing step creates no significant print-through due to the small amount of material removed. We are presently completing a set of 4" (10.2cm) diameter test mirrors good to better than 1/10th wave P-V (@633nm) or 1/80th wave RMS. Each mirror is a monolithic structure of single crystal silicon weighing about 80 grams. We are just starting a set of mirrors for the GeoSpec (Geostationary Spectrograph) instrument, including a 10" (25.4cm) diameter, F/3.5 primary.
© (2003) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Vincent T. Bly, "Light weight mirrors from single crystal silicon", Proc. SPIE 10314, Optifab 2003: Technical Digest, 103140V (19 May 2003); doi: 10.1117/12.2284020; https://doi.org/10.1117/12.2284020
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