Simulations of CO2 laser interaction with silica and comparison to experiments
2014
Localized CO 2 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 CO 2 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 CO 2 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.
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