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22 results on '"Parreault, Romain"'

8. Large optics metrology for high-power lasers

Author

Bouillet, Stéphane, primary, Ameil, Christel, additional, Beau, Vincent, additional, Bonville, Odile, additional, Cavaro, Sandy, additional, Courchinoux, Roger, additional, Daurios, Jérôme, additional, Donval, Thierry, additional, Eupherte, Laure, additional, Fréville, Sandrine, additional, Gaborit, Gaël, additional, Lebeaux, Isabelle, additional, Leymarie, Christophe, additional, Martin, Sébastien, additional, Parreault, Romain, additional, Razé, Gérard, additional, Roquin, Nadja, additional, and Lamaignère, Laurent, additional

Published
2019
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16. Parametric study of laser-induced damage growth in fused silica optics with large beams at 351??nm. Part II: fractal analysis

Author

Veinhard, Matthieu, Bonville, Odile, Courchinoux, Roger, Parreault, Romain, Natoli, Jean-Yves, and Lamaignère, Laurent

Abstract

The impact of laser fluence and pulse duration on both the rate and probability of growth of laser-induced damage sites has been reported and analyzed statistically in a companion paper. In this paper, we report and analyze the volume morphology of damage sites during the growth process in fused silica optical components, at 351 nm, under various laser fluence and pulse durations. Fractal analysis has been used to quantify the bulk damage morphology. A clear link between the damage morphology and laser pulse duration has been observed. The results from fractal analysis allows for a better understanding of the results from the stochastic approach developed in our companion paper. More specifically, fractal analysis shows how the laser parameters such as fluence and pulse duration impact the phenomenology and the dynamics of the growth process.

Published
2020

17. Parametric study of laser-induced damage growth in fused silica optics with large beams at 351??nm, part I: stochastic approach

Author

Veinhard, Matthieu, Bonville, Odile, Bouillet, Stéphane, Courchinoux, Roger, Parreault, Romain, Natoli, Jean-Yves, and Lamaignère, Laurent

Abstract

Both the rate and probability of the growth of laser-induced damage sites in fused silica depend on several parameters. In this two-part paper, we investigate the impact of the laser parameters on damage growth. In Part I, we present statistical measurements of damage growth at different energy densities, pulse durations, and initial damage sizes. In Part II, we use fractal analysis to quantify the evolution of the damage morphology as a function of the laser energy density and pulse duration. Damage initiation is performed using phase masks. These phase masks allow for the initiation of evenly spaced damage sites that can then be exposed to the same laser beam, and, therefore, the same pulse duration. This configuration allowed the study of damage growth in a large population of more than 5000 damage sites. The results clearly indicate that both the probability and the rate at which a damage site will grow strongly depend on the laser pulse duration. These differences can be explained by hypotheses that we have developed from an observation of the bulk damage morphology. Such observations will be presented in detail in the second part of this article.

Published
2020

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