Improving the performance of interference coatings for high-power laser optics

Most optical surfaces within high-power laser systems require multilayer interference coatings. These are usually high-reflector (HR) coatings to provide a maximum reflectance at the laser wavelength or anti-reflection (AR) coatings to provide a minimum reflectance. Occasionally, polarizers or other types of beamsplitters are required. As the systems become more complicated, multiple wavelength requirements become more common, perhaps necessitating high reflectance at alignment laser wavelengths or high transparency for optical viewing through the system.

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