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Possible linear-to-circular polarization conversion had been studied for the Laser MégaJoule. We measured the consequences of such polarization conversion on laser-induced damage using the MELBA testbed. The MELBA laser is located in CEA CESTA (France) and delivers a nanosecond UV centimeter-sized laser beam. Experimental comparison of polarizations states showed a significant decrease of damage densities in circular polarization. Thanks to the particular imaging setup, we were able to explain this by both a reduction of the Kerr effect (supported by theory) and a reduction of the intrinsic absorption of silica optics defects.
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Sylvain Grosjean, Charles Bouyer, Martin Cormier, Jean-François Gleyze, Nadja Roquin, Jean-Yves Natoli, Laurent Lamaignère, "Influence of linear-to-circular polarization conversion on laser-induced damage of fused silica at 351 nm," Proc. SPIE PC12726, Laser-Induced Damage in Optical Materials 2023, PC127260S (24 November 2023); https://doi.org/10.1117/12.2685228