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Proceedings Paper

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

Paper Details

Date Published: 20 September 2004
PDF: 9 pages
Proc. SPIE 5448, High-Power Laser Ablation V, (20 September 2004);
Show Author Affiliations
Laurent Lamaignere D.D.S., CEA-Cesta (France)
Herve Bercegol, CEA-Cesta (France)
Philippe Bouchut, CEA-LETI (France)
Annelise During, CEA-Cesta (France)
Jerome Neauport, CEA-Cesta (France)
Herve Piombini, CEA-Le Ripault (France)
Gerard Raze, CEA-Cesta (France)

Published in SPIE Proceedings Vol. 5448:
High-Power Laser Ablation V
Claude R. Phipps, Editor(s)

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