Cryostable lightweight frit-bonded silicon mirror

Frank M. Anthony; Douglas R. McCarter; Matt Tangedahl; David A. Content

doi:10.1117/12.451712

25 November 2002 Cryostable lightweight frit-bonded silicon mirror

Frank M. Anthony, Douglas R. McCarter, Matt Tangedahl, David A. Content

Proceedings Volume 4822, Cryogenic Optical Systems and Instruments IX; (2002) https://doi.org/10.1117/12.451712
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

Abstract

The excellent polishability, low density and relatively high stiffness of silicon make it an attractive candidate for optical applications that require superior performance. Assembly of silicon details by means of glass frit bonding permits significant weight reduction thus enhancing the benefit of silicon mirrors. To demonstrate the performance potential, a small lightweight glass frit bonded silicon mirror was fabricated and tested for cryostability. The test mirror was 12.5cm in diameter with a 60cm spherical radius and a maximum thickness, at the perimeter, of 2.5cm. A machined silicon core was used to stiffen the two face sheets of the silicon sandwich. These three elements were assembled, by glass frit bonding, to form the substrate that was polished. The experimental evaluation, in a liquid nitrogen cryostat, demonstrated cryostability performance significantly better than required by the mirror specification.

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Frank M. Anthony, Douglas R. McCarter, Matt Tangedahl, and David A. Content "Cryostable lightweight frit-bonded silicon mirror", Proc. SPIE 4822, Cryogenic Optical Systems and Instruments IX, (25 November 2002); https://doi.org/10.1117/12.451712

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