Protective broadband window coatings

Joel Askinazi; Authi A. Narayanan

doi:10.1117/12.277060

27 June 1997 Protective broadband window coatings

Joel Askinazi, Authi A. Narayanan

Proceedings Volume 3060, Window and Dome Technologies and Materials V; (1997) https://doi.org/10.1117/12.277060
Event: AeroSense '97, 1997, Orlando, FL, United States

Abstract

Optical windows employed in current and future airborne and ground based optical sensor systems are required to provide long service life under extreme environmental conditions including blowing sand and high speed rain. State of the art sensor systems are employing common aperture windows which must provide optical bandpasses from the TV to the LWIR. Operation Desert Storm experience indicates that current optical coatings provide limited environmental protection which adversely affects window life cycle cost. Most of these production coatings also have limited optical bandpasses (LWIR, MWIR, or TV-NIR). A family of optical coatings has been developed which provide a significant increase in rain and sand impact protection to current optical window materials. These coatings can also be tailored to provide either narrow optical bandwidth (e.g., LWIR) or broadband transmittance (TV- LWIR). They have been applied to a number of standard optical window materials. These coating have successfully completed airborne rain and sand abrasion test with minimal impact on optical window performance. Test results are presented. Low cost service life is anticipated as well as the ability to operate windows in even more taxing environments than currently feasible.

Citation Download Citation

Joel Askinazi and Authi A. Narayanan "Protective broadband window coatings", Proc. SPIE 3060, Window and Dome Technologies and Materials V, (27 June 1997); https://doi.org/10.1117/12.277060

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