Physics – Optics
Scientific paper
Oct 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995spie.2543..248b&link_type=abstract
Proc. SPIE Vol. 2543, p. 248-253, Silicon Carbide Materials for Optics and Precision Structures, Mark A. Ealey; Ed.
Physics
Optics
Scientific paper
Optical fabrication methods for a one meter reaction bonded optical grade silicon carbide (RBO SiC) substrate have been successfully developed and demonstrated by Itek Optical Systems in Lexington, Massachusetts. A 1.125 m multiplied by .825 m RBO SiC panel, the largest SiC ever fabricated, has been ground and polished to a surface figure of lambda/20 rms at lambda equals .6328 nm. The single most critical technology area for RBO SiC optics has been attaining a high quality optical surface finish; this bimodal material requires particular processing techniques due to the hardness differences between the silicon and silicon carbide components. The measured surface finish quality for this one meter mirror is 15.5 angstrom rms, nearly twice as good as the specified 25 angstrom rms. Furthermore, the variation of surface finish over the mirror area is very low, sigma equals 2 angstrom. The mirror represents the state-of-the-art for lightweight, high quality SiC optical mirrors.
Breidenthal Robert S.
Galat-Skey Regina
Geany John J.
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