Enhanced optical damage resistance of fused silica surfaces using UV laser conditioning and CO2 laser treatment

Laurent Lamaignere D.D.S.; Herve Bercegol; Philippe Bouchut; Annelise During; Jerome Neauport; Herve Piombini; Gerard Raze

doi:10.1117/12.547071

20 September 2004 Enhanced optical damage resistance of fused silica surfaces using UV laser conditioning and CO₂ laser treatment

Laurent Lamaignere D.D.S., Herve Bercegol, Philippe Bouchut, Annelise During, Jerome Neauport, Herve Piombini, Gerard Raze

Author Affiliations +

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.

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Laurent Lamaignere D.D.S., Herve Bercegol, Philippe Bouchut, Annelise During, Jerome Neauport, Herve Piombini, and 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); https://doi.org/10.1117/12.547071

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