Electric-Field Enhancement by Nodular Defects in Multilayer Coatings Irradiated at Normal and 45 (degree) Incidence
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 it is 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 {micro}m 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.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 15005172
- Report Number(s):
- UCRL-JC-153466; TRN: US0401577
- Resource Relation:
- Conference: Boulder Damage Symposium 35th Annual Symposium on Optical Materials for High Power Lasers, Boulder, CO (US), 09/21/2003--09/24/2003; Other Information: PBD: 18 Sep 2003
- Country of Publication:
- United States
- Language:
- English
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