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Proceedings Paper

Characteristics of thick (>12 mm) Class225 EFG sapphire sheet for IR window applications
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Paper Abstract

Demand for larger aperture sapphire IR windows is increasing. To withstand the higher dynamic and pressure forces exerted on them these larger windows require thicker material. Edge Defined Film-fed Growth (EFG)TM Sapphire crystals have traditionally been grown with a thickness of ≤ 11 mm, then finished and polished to a nominal thickness of 5.5 mm. We present optical characteristics data here for Class225(R) EFGTM sapphire sheet that is being grown up to 22 mm thick and finished at 16.8 mm.

Paper Details

Date Published: 11 May 2009
PDF: 5 pages
Proc. SPIE 7302, Window and Dome Technologies and Materials XI, 730203 (11 May 2009); doi: 10.1117/12.818020
Show Author Affiliations
John Locher, Saint-Gobain Crystals (United States)
Christopher Jones, Saint-Gobain Crystals (United States)
Herbert Bates, Saint-Gobain Crystals (United States)
Jeffrey Rioux, Saint-Gobain Crystals (United States)

Published in SPIE Proceedings Vol. 7302:
Window and Dome Technologies and Materials XI
Randal W. Tustison, Editor(s)

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