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Light intensification modeling of coating inclusions irradiated at 351 and 1053 nm

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Abstract

Electric-field modeling provides insight into the laser damage resistance potential of nodular defects. The laser-induced damage threshold for high-reflector coatings is 13× lower at the third harmonic (351nm) than at the first harmonic (1053nm) wavelength. Linear and multiphoton absorption increases with decreasing wavelength, leading to a lower-third harmonic laser resistance. Electric-field effects can also be a contributing mechanism to the lower laser resistance with decreasing wavelength. For suitably large inclusions, the nodule behaves as a microlens. The diffraction-limited spot size decreases with wavelength, resulting in an increase in intensity. Comparison of electric-field finite-element simulations illustrates a 3× to 16× greater light intensification at the shorter wavelength.

© 2007 Optical Society of America

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