20 September 2004 Enhanced optical damage resistance of fused silica surfaces using UV laser conditioning and CO2 laser treatment
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Proceedings Volume 5448, High-Power Laser Ablation V; (2004) https://doi.org/10.1117/12.547071
Event: High-Power Laser Ablation, 2004, Taos, New Mexico, United States
Abstract
For high power laser applications like the "Laser Megajoule" facility under construction in France, laser-induced damage threshold (LIDT) in fused silica is a limitation. CEA has made efforts to improve LIDT at the wavelength of 351 nm. Polishing and post polishing processes have been optimized. Laser damage sites density was decreased by several orders of magnitude by combining different fabrication steps. In order to further enhance optical laser resistance and to remove damaged sites on full-size optics, several small-beam raster scanning techniques have been studied and developed to condition fused silica optics. To stop the growth of damage sites, a continuous CO2 laser was used to re-melt them. Laser induced damage tests, performed on instrumented and automated facilities, are reported in order to check and illustrate the effectiveness of these treatments. Damage initiation studies as well as damage growth measurements are presented.
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Laurent Lamaignere, Laurent Lamaignere, Herve Bercegol, Herve Bercegol, Philippe Bouchut, Philippe Bouchut, Annelise During, Annelise During, Jerome Neauport, Jerome Neauport, Herve Piombini, Herve Piombini, Gerard Raze, Gerard Raze, } "Enhanced optical damage resistance of fused silica surfaces using UV laser conditioning and CO2 laser treatment", Proc. SPIE 5448, High-Power Laser Ablation V, (20 September 2004); doi: 10.1117/12.547071; https://doi.org/10.1117/12.547071
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