Polishing process for concave lightweight silicon-coated silicon carbide optics

Lisa R. Rich; David Arthur Crowe

doi:10.1117/12.225296

23 October 1995 Polishing process for concave lightweight silicon-coated silicon carbide optics

Lisa R. Rich, David Arthur Crowe

Proceedings Volume 2543, Silicon Carbide Materials for Optics and Precision Structures; (1995) https://doi.org/10.1117/12.225296
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

Advanced optical systems, currently under consideration, propose the use of lightweight, segmented, long radii elements. Reaction-bonded silicon carbide (RB SiC) is quickly becoming a contender in the materials market for these large, lightweight mirrors due, in part, to its relatively low thermal expansion and high stiffness to weight ratio. The RB SiC manufacturing processes can be considered advanced in comparison to the polishing and finishing processes on bare RB SiC, or on clad RB SiC substrates. In an effort to improve the polishing and finishing techniques, Eastman Kodak Company has investigated a polishing process for physical vapor deposited silicon (PVD Si) coated RB SiC optics and has demonstrated this process on a lightweight, concave, PVD Si-coated RB SiC hexagonal optic. This discussion includes the modification and redesign of an existing conventional planetary table, durability test results on the PVD Si/RB SiC coating bond, process approach and results for the hexagonal demonstration piece, and the thermal stability analysis of the hexagonal mirror upon completion of polishing and ion figuring the front surface of the mirror.

Citation Download Citation

Lisa R. Rich and David Arthur Crowe "Polishing process for concave lightweight silicon-coated silicon carbide optics", Proc. SPIE 2543, Silicon Carbide Materials for Optics and Precision Structures, (23 October 1995); https://doi.org/10.1117/12.225296

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