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Proceedings Paper

Current status of very large sapphire crystal growth for optical applications
Author(s): Frederick Schmid; Chandra P. Khattak; Henry H. Rogers; D. Mark Felt; Joel Askinazi; Richard V. Wientzen
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Paper 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.

Paper Details

Date Published: 26 July 1999
PDF: 7 pages
Proc. SPIE 3705, Window and Dome Technologies and Materials VI, (26 July 1999); doi: 10.1117/12.354643
Show Author Affiliations
Frederick Schmid, Crystal Systems, Inc. (United States)
Chandra P. Khattak, Crystal Systems, Inc. (United States)
Henry H. Rogers, Crystal Systems, Inc. (United States)
D. Mark Felt, Crystal Systems, Inc. (United States)
Joel Askinazi, Raytheon Optical Systems, Inc. (United States)
Richard V. Wientzen, Raytheon Optical Systems, Inc. (United States)

Published in SPIE Proceedings Vol. 3705:
Window and Dome Technologies and Materials VI
Randal W. Tustison, Editor(s)

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