Ultralightweight borosilicate Gas-Fusion mirror for cryogenic testing

Michael Voevodsky; Richard W. Wortley

doi:10.1117/12.506142

12 December 2003 Ultralightweight borosilicate Gas-Fusion mirror for cryogenic testing

Michael Voevodsky, Richard W. Wortley

Proceedings Volume 5179, Optical Materials and Structures Technologies; (2003) https://doi.org/10.1117/12.506142
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States

Abstract

This paper addresses a NASA Marshall Space Flight Center development contract for Hextek Corporation to produce a 250 mm ultra-lightweight borosilicate mirror blank for cryogenic testing to 30°K. Published data has shown borosilicate glass to be a highly stable material at extremely cold temperatures, with a lower cte (coefficient of thermal expansion) then Zerodur, ULE or fused silica. Hextek would use the cost effective and rapid production Gas-Fusion technology to fabricate a 15 kg/m² substrate that would be figured and polished by NASA and tested cryogenically in the MSFC X-ray Calibration Facility. The expected payoff for NASA is the opportunity to prove out the performance for a substrate technology and mirror material that is capable of reducing cost, schedule and risk associated with the primary mirror in systems operating at cryogenic temperatures.

Citation Download Citation

Michael Voevodsky and Richard W. Wortley "Ultralightweight borosilicate Gas-Fusion mirror for cryogenic testing", Proc. SPIE 5179, Optical Materials and Structures Technologies, (12 December 2003); https://doi.org/10.1117/12.506142

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