Rain Erosion-Resistant Antireflective Coatings For Infrared Windows

W. W. Doerffler; W. T. Boord; H. Y. B. Mar

doi:10.1117/12.955773

20 January 1978 Rain Erosion-Resistant Antireflective Coatings For Infrared Windows

W. W. Doerffler, W. T. Boord, H. Y. B. Mar

Proceedings Volume 0121, Optics in Adverse Environments I; (1978) https://doi.org/10.1117/12.955773
Event: 21st Annual Technical Symposium, 1977, San Diego, United States

Abstract

AR coatings for potential window materials (ZnS and GaAs) were developed. Emphasis was placed on developing AR coatings with rain erosion resistance. Rain erosion resistance of two-layer AR coatings (NdF3/ZnSe, LaF1/ZnSe, and ThF4/ZnSe) on small ZnS substrates was demonstrated. When exposed to a simulaÃ¢â€šÂ¬ed one inch per hour rainfall at 470 mph for 20 minutes, the coatings remained intact with about 10 percent loss in transmittance. The same coatings on GaAs were severely degraded by the rain erosion test. The surface finish of the substrate appeared to be an important factor for rain erosion resistance. Coatings on substrates that satisfied the scratch-dig specification of 60-40 exhibited superior rain erosion resitance.

Citation Download Citation

W. W. Doerffler, W. T. Boord, and H. Y. B. Mar "Rain Erosion-Resistant Antireflective Coatings For Infrared Windows", Proc. SPIE 0121, Optics in Adverse Environments I, (20 January 1978); https://doi.org/10.1117/12.955773

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