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18 June 2024 Comprehensive study of microstructure and chemical composition of all-silica GLAD quarter-waveplate coatings for high power laser
Solène Bertet, Marine Chorel, Eric G. Lavastre, Sara MacNally, Corinne Marcel, Bruno Gallas, Marcela Mireles
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Proceedings Volume PC13020, Advances in Optical Thin Films VIII; PC130200K (2024) https://doi.org/10.1117/12.3017015
Event: SPIE Optical Systems Design, 2024, Strasbourg, France
Abstract
To build quarter-wave plate components for a high-power laser application, the Laboratory for Laser Energetics has developed a 21-layer silica coating fabricated by GLancing Angle Deposition. This stack alternates columnar birefringent layers with isotropic layers. We present a study on the SiO2 matrix state, the sub-stoichiometry and presence of oxygen vacancies that affect robustness and a reduced laser damage resistance. The composition throughout the film thickness is investigated thanks to GD-OES and Tof-SIMS combined with photoelectron spectroscopies for the composition. Anisotropic and isotropic layers exhibit differences in composition, between them and throughout the depth. Photoluminescence measurements show a peak that could represent oxygen vacancies that may reduce the damage threshold. Vibrational characterization further supports our findings. This comprehensive overview is discussed in relation to deposition process and resistance to laser-induced damage and will enable us to improve our current coatings.
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Solène Bertet, Marine Chorel, Eric G. Lavastre, Sara MacNally, Corinne Marcel, Bruno Gallas, and Marcela Mireles "Comprehensive study of microstructure and chemical composition of all-silica GLAD quarter-waveplate coatings for high power laser", Proc. SPIE PC13020, Advances in Optical Thin Films VIII, PC130200K (18 June 2024); https://doi.org/10.1117/12.3017015
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KEYWORDS
Chemical composition
High power lasers
Laser microstructuring
Optical coatings
Silica
Laser induced damage
Resistance
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