Enhancing the accuracy of laser-induced damage tests by measuring non-linear beam propagation in Laser MégaJoule optics: example of the study of the impact of beam polarization state on fused silica

Sylvain Grosjean; Charles Bouyer; Martin Cormier; Jean-François Gleyze; Nadja Roquin; Jean-Yves Natoli; Laurent Lamaignère

doi:10.1117/12.3016076

18 June 2024 Enhancing the accuracy of laser-induced damage tests by measuring non-linear beam propagation in Laser MégaJoule optics: example of the study of the impact of beam polarization state on fused silica

Sylvain Grosjean, Charles Bouyer, Martin Cormier, Jean-François Gleyze, Nadja Roquin, Jean-Yves Natoli, Laurent Lamaignère

Author Affiliations +

Proceedings Volume PC13021, Optical Fabrication and Testing VIII; PC1302108 (2024) https://doi.org/10.1117/12.3016076
Event: SPIE Optical Systems Design, 2024, Strasbourg, France

Abstract

Accurate laser damage testing for Laser MégaJoule (LMJ) fused silica optics is crucial for predicting their lifetimes. However, beam propagation in optics is usually neglected and yet, damage sites are mostly initiated on the exit face of optics. The MELBA testbed in CEA CESTA (France) delivers nanosecond UV laser pulses representative of LMJ optics conditions on a centimeter scale. Our particular imaging system measures the beam spatial profile before and after propagation in samples, enabling quantification of self-focusing induced by the Kerr effect. This metrology is necessary for laser damage parametric studies, particularly when these laser parameters influence the Kerr effect. We present here a study of the impact of a linear-to-circular polarization conversion on laser damage, which highlights the importance of accurately assessing non-linear beam propagation for laser damage tests.

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(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Sylvain Grosjean, Charles Bouyer, Martin Cormier, Jean-François Gleyze, Nadja Roquin, Jean-Yves Natoli, and Laurent Lamaignère "Enhancing the accuracy of laser-induced damage tests by measuring non-linear beam propagation in Laser MégaJoule optics: example of the study of the impact of beam polarization state on fused silica", Proc. SPIE PC13021, Optical Fabrication and Testing VIII, PC1302108 (18 June 2024); https://doi.org/10.1117/12.3016076

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KEYWORDS

Laser induced damage

Polarization

Laser beam propagation

Silica

Optical testing

Kerr effect

Polarization density

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