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22 September 2014 Large beam damage experiments in fused silica optics at 351nm
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Abstract
Laser damage growth on the exit surface of fused silica optics is considered as exponential, the growth coefficient depending essentially on fluence. In this presentation, experiments with large beams have been carried out at 351 nm under nanosecond pulses. A statistical analysis has then been conducted leading to a refined representation of the growth. The effect of several parameters has also been taken into account to describe precisely the growth phenomenon. Finally, the two main parameters reporting the growth are the mean fluence and the size of the damage sites. Contributions of other parameters have been estimated too: the number of neighbors around the damage site, the shot number.... From experimental results, a model based on a statistical approach has been developed that permits the description of a complete sequence of growth. At the end, the knowledge of damage initiation and damage growth permit the determination of the lifetime of optical components illuminated with successive shots.
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L. Lamaignère, G. Dupuy, A. Bourgeade, A. Roques, and R. Courchinoux "Large beam damage experiments in fused silica optics at 351nm", Proc. SPIE 9238, Pacific Rim Laser Damage 2014: Optical Materials for High-Power Lasers, 92380C (22 September 2014); https://doi.org/10.1117/12.2073640
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