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24 November 2023 Exploring nonlinear effects of laser irradiation on single- and multi-layer dielectric coatings: a study on HfO2, ZrO2, and Al2O3 coatings
Erikas Atkocaitis, Martynas Keršys, Simonas Kicas, Vaida Grasyte, Justinas Galinis, Austeja Aleksiejute, Andrius Melninkaitis
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Proceedings Volume PC12726, Laser-Induced Damage in Optical Materials 2023; PC127260D (2023) https://doi.org/10.1117/12.2685117
Event: SPIE Laser Damage, 2023, Dublin/Livermore, California, United States
Abstract
Recent studies suggest that fatigue effect in dielectric optical coatings is possibly associated with the presence of strong nonlinear absorption, however, up to now there was only indirect evidence for such hypothesis. One of the reasons for that was a technical rigor to characterize nonlinear absorption losses in optical coatings and a lack of pertinent experimental data. Recent advancement of common-path interferometry and LIDT testing allows us to overcome such limitations. In this study we examine nonlinear response and fatigue effect in single- and multilayer dielectric coatings below single shot damage threshold. Although there is no quantitative model that could predict fatigue from absorptance, we found an interesting correlation between nonlinear absorption and fatigue effect under comparable experimental conditions. These results help us to understand the mechanism of fatigue in optical coatings and possibly make more durable femtosecond optics.
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(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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Erikas Atkocaitis, Martynas Keršys, Simonas Kicas, Vaida Grasyte, Justinas Galinis, Austeja Aleksiejute, and Andrius Melninkaitis "Exploring nonlinear effects of laser irradiation on single- and multi-layer dielectric coatings: a study on HfO2, ZrO2, and Al2O3 coatings", Proc. SPIE PC12726, Laser-Induced Damage in Optical Materials 2023, PC127260D (24 November 2023); https://doi.org/10.1117/12.2685117
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KEYWORDS
Dielectrics
Absorption
Laser irradiation
Optical coatings
Zirconium dioxide
Laser damage threshold
Material fatigue
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