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Proceedings Paper

Growth of 15-inch diameter sapphire boules
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Paper Abstract

The world's largest sapphire boules up to 340-mm diameter are produced by the Heat Exchanger Method (HEM). In order to meet all applications, the highest purity crackle is used so the product has impurity levels very near the detectability limit of Glow Discharge Mass Spectroscopy (GDMS). The charge size of production 340-mm diameter sapphire boules was increased from 55-kg to 70-kg, and larger 380-mm diameter, 84-kg boules were produced. These boules were used to produce 315-mm diameter, 132-mm high sapphire cylinders to meet customer requirements. Efforts have been taken to produce a nearly flat top surface of HEM-grown boules with minimal undulations along the sidewalls to allow fabrication of larger sapphire pieces for production boules.

Paper Details

Date Published: 26 September 2003
PDF: 7 pages
Proc. SPIE 5078, Window and Dome Technologies VIII, (26 September 2003); doi: 10.1117/12.487633
Show Author Affiliations
Chandra P. Khattak, Crystal Systems, Inc. (United States)
Paul J. Guggenheim, Crystal Systems, Inc. (United States)
Frederick Schmid, Crystal Systems, Inc. (United States)

Published in SPIE Proceedings Vol. 5078:
Window and Dome Technologies VIII
Randal W. Tustison, Editor(s)

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