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High-reflectivity coatings are designed to control the reflection of light at material interfaces, thereby enhancing overall optical performance. Depending on the application requirements, these coatings can be classified into three main types: metallic films, metal-dielectric hybrid films, and dielectric multilayer films.
Metallic films naturally offer high reflectivity across a broad wavelength range, making them suitable for broadband applications. In contrast, dielectric coatings are formed by stacking multiple layers of materials with alternating high and low refractive indices. Through interference effects, these coatings selectively enhance reflectivity at specific wavelengths while providing excellent thermal stability and environmental resistance.
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