26 July 1999 Current status of very large sapphire crystal growth for optical applications
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Abstract
Sapphire is an ideal visible-MWIR window due to its excellent optical and mechanical properties and its availability in large sizes up to 340-mm diameter boules. Anticipated applications for new, high performance optical systems call for even larger, 450-750 mm diameter, windows. The present effort has focused on producing 500-mm diameter sapphire boules using the Heat Exchanger Method. Three experimental growth runs demonstrated the feasibility of producing 500-mm diameter sapphire boules. Completely crack- free boules have not been grown, but large size sapphire pieces up to 400 mm by 280 mm have yielded from these experimental runs.
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Frederick Schmid, Chandra P. Khattak, Henry H. Rogers, D. Mark Felt, Joel Askinazi, Richard V. Wientzen, "Current status of very large sapphire crystal growth for optical applications", Proc. SPIE 3705, Window and Dome Technologies and Materials VI, (26 July 1999); doi: 10.1117/12.354643; https://doi.org/10.1117/12.354643
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