Why silicon for telescope mirrors and structures?

Details Why silicon for telescope mirrors and structures? Why silicon for telescope mirrors and structures?

Aug 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spie.7425e..13p&link_type=abstract

Optical Materials and Structures Technologies IV. Edited by Robichaud, Joseph L.; Goodman, William A.. Proceedings of the SPIE,

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Single crystal silicon (SCSi) is light, strong, has excellent thermal properties, is readily available and cost and delivery are competitive with, and probably better than, either beryllium or silicon carbide. In addition, SCSi's zero-defect crystal structure enables polishing to near-perfect surfaces. Recent developments in direct bonding have led to simple methods of attaching SCSi, a brittle material, to enhance its high compressive strength and avoid tensile/brittle failures. Dynamic testing of a bonded assembly has demonstrated high resonant frequencies and damping capacity. Other recent test results have shown the excellent temporal and thermal stability of both monolithic and bonded mirror specimens. So why not choose silicon?

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