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Proceedings Paper

Recent advances in durable sapphire windows for visible to MWIR and UV applications
Author(s): Joel Askinazi; Robert D. Poirier; Ronald Koons; Joseph R. Cerino
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Paper Abstract

Sapphire is being used more frequently as an optical window material in conjunction with optical sensors operations in the UV and in the visible to MWIR bands. This paper addresses two related development efforts. The first is associated with the development of a thick Al2O3 coating to be deposited over gridded sapphire windows operating in the visible to MWIR optical band. This coating serves as an environmental barrier - in particular to protect the grids against high-speed rain impact. The second is associated with the optimization of the optical transmittance properties of the environmental barrier for UV applications. This paper describes each area of development, the resulting coatings, the highly successful performance results achieved.

Paper Details

Date Published: 26 July 1999
PDF: 8 pages
Proc. SPIE 3705, Window and Dome Technologies and Materials VI, (26 July 1999); doi: 10.1117/12.354610
Show Author Affiliations
Joel Askinazi, Raytheon Optical Systems, Inc. (United States)
Robert D. Poirier, Raytheon Optical Systems, Inc. (United States)
Ronald Koons, Raytheon Optical Systems, Inc. (United States)
Joseph R. Cerino, 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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