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Intrinsic and roughness-induced absorption of electromagnetic radiation incident on optical surfaces

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Abstract

The intrinsic and the surface-induced optical absorption of typical metals are calculated for various wavelengths and roughness parameters as a function of incident angle. In the infrared region the surface-induced absorption is <10% of the total absorption and is insensitive to the wavelength for high-quality mirrors. However, for mirrors of certain periodic structure the presence of a surface plasma resonance can generate substantial absorption. Absorption caused by Gaussian-shaped surface defects is also considered. The results are discussed with some experiments in laser damage research.

© 1982 Optical Society of America

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