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Proceedings Paper

Simulations of CO2 laser interaction with silica and comparison to experiments
Author(s): Thomas Doualle; Laurent Gallais; Philippe Cormont; David Hébert; Patrick Combis; Jean-Luc Rullier
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Paper Abstract

Localized CO2 laser heating of silica glass has demonstrated its ability to mitigate surface damage on optics used for high power laser applications. The parameters for this process such as the power, the beam size and the exposition time are however critical and some fundamental studies on the silica behavior under CO2 laser irradiation are required to develop the processes. It is necessary for instance to understand the silica transformation, the material ejection and the thermo-mechanical stresses induced by the laser heating and subsequent cooling. A thermo-mechanical model based on finite-element method has been used to calculate the temperature of silica heated by CO2 laser irradiation and the residual stress after cooling of the samples. The model, as the different parameters used for calculations, are detailed in this paper and the numerical results are compared to different dedicated experimental studies.

Paper Details

Date Published: 31 October 2014
PDF: 9 pages
Proc. SPIE 9237, Laser-Induced Damage in Optical Materials: 2014, 92371R (31 October 2014); doi: 10.1117/12.2068194
Show Author Affiliations
Thomas Doualle, Aix Marseille Univ., Centrale Marseille, CNRS, Institut Fresnel (France)
Laurent Gallais, Aix Marseille Univ., Centrale Marseille, CNRS, Institut Fresnel (France)
Philippe Cormont, CEA-CESTA (France)
David Hébert, CEA-CESTA (France)
Patrick Combis, CEA-DAM (France)
Jean-Luc Rullier, CEA-CESTA (France)

Published in SPIE Proceedings Vol. 9237:
Laser-Induced Damage in Optical Materials: 2014
Gregory J. Exarhos; Vitaly E. Gruzdev; Joseph A. Menapace; Detlev Ristau; MJ Soileau; Detlev Ristau, Editor(s)

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