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Proceedings Paper

Rain Erosion-Resistant Antireflective Coatings For Infrared Windows
Author(s): W. W. Doerffler; W. T. Boord; H. Y. B. Mar
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Paper 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 simula€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.

Paper Details

Date Published: 20 January 1978
PDF: 8 pages
Proc. SPIE 0121, Optics in Adverse Environments I, (20 January 1978); doi: 10.1117/12.955773
Show Author Affiliations
W. W. Doerffler, Honeywell, Inc. (United States)
W. T. Boord, Honeywell, Inc. (United States)
H. Y. B. Mar, Honeywell, Inc. (United States)


Published in SPIE Proceedings Vol. 0121:
Optics in Adverse Environments I
Enrique Bernal G.; Harry V. Winsor, Editor(s)

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