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Optical, mechanical, and erosion-protective characteristics of boron and gallium phosphide are evaluated as single films and within antireflection multilayers. These coatings are shown to combine broadband infrared transmission with environmental durability, specifically in relation to abrasion resistance and elevated temperature performance up to 500°C. Rain erosion protection of all common IR optical materials is demonstrated from single water jet impact and whirling arm tests. Protective characteristics in relation to solid particle impact are described.
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Gibson et al. (1994) studied this question.
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