Heat treatment of fused silica optics repaired by CO2 laser

Thomas Doualle; Laurent Gallais; Philippe Cormont; Jean-Luc Rullier

doi:10.1117/12.2194967

23 November 2015 Heat treatment of fused silica optics repaired by CO₂ laser

Thomas Doualle, Laurent Gallais, Philippe Cormont, Jean-Luc Rullier

Proceedings Volume 9632, Laser-Induced Damage in Optical Materials: 2015; 963216 (2015) https://doi.org/10.1117/12.2194967
Event: SPIE Laser Damage, 2015, Boulder, Colorado, United States

Abstract

In the context of high power laser applications, we study the effect of a heat treatment on CO₂ laser mitigation of laser damage sites on fused silica samples. The isothermal annealing in a furnace is investigated and then compared to the local annealing by CO₂ laser irradiation that is applied to enhance laser damage resistance on mitigated sites. Before and after isothermal annealing, we study the sites morphology, the evolution of residual stress and the laser-induced damage threshold measured at 355nm, 3ns. The results show that the initial laser damage probabilities were significantly improved after annealing at 1050°C for 12 hours. These results are compared to simulations with a thermo-mechanical model based on finite-element method.

Citation Download Citation

Thomas Doualle, Laurent Gallais, Philippe Cormont, and Jean-Luc Rullier "Heat treatment of fused silica optics repaired by CO₂ laser", Proc. SPIE 9632, Laser-Induced Damage in Optical Materials: 2015, 963216 (23 November 2015); https://doi.org/10.1117/12.2194967

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