Recent advances in durable sapphire windows for visible to MWIR and UV applications

Joel Askinazi; Robert D. Poirier; Ronald Koons; Joseph R. Cerino

doi:10.1117/12.354610

26 July 1999 Recent advances in durable sapphire windows for visible to MWIR and UV applications

Joel Askinazi, Robert D. Poirier, Ronald Koons, Joseph R. Cerino

Proceedings Volume 3705, Window and Dome Technologies and Materials VI; (1999) https://doi.org/10.1117/12.354610
Event: AeroSense '99, 1999, Orlando, FL, United States

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.

Citation Download Citation

Joel Askinazi, Robert D. Poirier, Ronald Koons, and Joseph R. Cerino "Recent advances in durable sapphire windows for visible to MWIR and UV applications", Proc. SPIE 3705, Window and Dome Technologies and Materials VI, (26 July 1999); https://doi.org/10.1117/12.354610

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