Electric-field enhancement by nodular defects in multilayer coatings irradiated at normal and 45° incidence

Christopher J. Stolz; Francois Y. Genin; Thomas V. Pistor

doi:10.1117/12.523453

10 June 2004 Electric-field enhancement by nodular defects in multilayer coatings irradiated at normal and 45° incidence

Christopher J. Stolz, Francois Y. Genin, Thomas V. Pistor

Author Affiliations +

Proceedings Volume 5273, Laser-Induced Damage in Optical Materials: 2003; (2004) https://doi.org/10.1117/12.523453
Event: XXXV Annual Symposium on Optical Materials for High Power Lasers: Boulder Damage Symposium, 2003, Boulder, Colorado, United States

Abstract

The standing-wave electric-field profile within multilayer coatings is significantly perturbated by a nodular defect. The intensity, which is proportional to the electric field squared, is increased in the high index material by ≥3x at normal incidence and ≥12x at 45 degrees incidence angle. Therefore is it not surprising that nodular defects are initiation sites of laser-induced damage. In this study, the impact of reflectance-band centering and incident angle are explored for a 1 μm diameter nodular defect seed overcoated with a 24 layer high-reflector constructed of quarter-wave thick alternating layers of hafnia and silica. The modeling was performed using a three-dimensional finite-element analysis code.

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Christopher J. Stolz, Francois Y. Genin, and Thomas V. Pistor "Electric-field enhancement by nodular defects in multilayer coatings irradiated at normal and 45° incidence", Proc. SPIE 5273, Laser-Induced Damage in Optical Materials: 2003, (10 June 2004); https://doi.org/10.1117/12.523453

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