Ultralow expansion titania-silica glass
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United States of America Patent
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Jun 8, 2021
Grant Date -
Aug 15, 2019
app pub date -
Apr 22, 2019
filing date -
Feb 13, 2015
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Abstract
Annealing treatments for modified titania-silica glasses and the glasses produced by the annealing treatments. The annealing treatments include an isothermal hold that facilitates equalization of non-uniformities in fictive temperature caused by non-uniformities in modifier concentration in the glasses. The annealing treatments may also include heating the glass to a higher temperature following the isothermal hold and holding the glass at that temperature for several hours. Glasses produced by the annealing treatments exhibit high spatial uniformity of CTE, CTE slope, and fictive temperature, including in the presence of a spatially non-uniform concentration of modifier.
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