10 June 2004 Electric-field enhancement by nodular defects in multilayer coatings irradiated at normal and 45° incidence
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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, 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); doi: 10.1117/12.523453; https://doi.org/10.1117/12.523453
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KEYWORDS
Multilayers

Polarization

Optical coatings

Reflectivity

Silica

3D modeling

Laser induced damage

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