Mr. Michael Voevodsky Profile

Michael Voevodsky

Vice President Business Dev at Hextek Corp

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Proceedings Article | 12 December 2003 Paper

Ultralightweight borosilicate Gas-Fusion mirror for cryogenic testing

Michael Voevodsky, Richard Wortley

Proceedings Volume 5179, (2003) https://doi.org/10.1117/12.506142

KEYWORDS: Mirrors, Cryogenics, Polishing, Space mirrors, Glasses, Silica, Plano, Borosilicate glass, Zerodur, Lead

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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.

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