Large optics from silicon carbide

Details Large optics from silicon carbide Large optics from silicon carbide

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992spie.1618...53p&link_type=abstract

Proc. SPIE Vol. 1618, p. 53-60, Large Optics II, Robert E. Parks; Ed.

Physics

Optics

Scientific paper

Silicon carbide (SiC) has become a legitimate competitor to beryllium (Be) for large lightweight mirrors due to its high stiffness to weight ratio and low thermal expansion. However, there are many kinds of SiC and some are better suited for mirrors than others. After a comparison of the various SiC types we described one type of reaction bonded SiC that can be near-net-shape fabricated into very lightweight mirrors in sizes ranging from a few centimeters to greater than two meters. Lightweight spherical mirrors of 0.18 and 0.50 m diameter have been fabricated and polished to very low surface roughness. The blank and optical fabrication techniques are described, and characterization data are presented for uncoated polished surfaces. These mirrors have surface roughness of 8 - 15 angstroms rms and (lambda) /10 figure.

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