Potential implications of environmental effects of ps and ns laser-induced damage for damage initiation mechanisms

Ted A. Laurence; C. W. Carr; Eyal Feigenbaum; Sonny Ly; Raluca Negres

doi:10.1117/12.2684097

24 November 2023 Potential implications of environmental effects of ps and ns laser-induced damage for damage initiation mechanisms

Ted A. Laurence, C. W. Carr, Eyal Feigenbaum, Sonny Ly, Raluca Negres

Author Affiliations +

Proceedings Volume PC12726, Laser-Induced Damage in Optical Materials 2023; PC127260J (2023) https://doi.org/10.1117/12.2684097
Event: SPIE Laser Damage, 2023, Dublin/Livermore, California, United States

Abstract

For pulse lengths between 1 and 60 ps, laser-induced modifications of optical materials undergo a transition from mechanisms intrinsic to the materials to defect-dominated mechanisms. Elucidating the location, size, and identity of these defects will greatly help efforts to reduce, mitigate, or eliminate these defects. We discuss our work that detailed the role of defects in the ps laser-modifications of SiO2 and HfO2 1/2-wave coatings. For HfO2 coatings, we included a study of environmental effects on the damage process. We found that the response of defects very near the surface are dependent on the environment, leading to worse damage in vacuum than in air. One or more constituents of air, most likely oxygen and/or water, suppress or lessen the effects of these defects during laser exposure. We discuss the implications of these findings for defect-driven laser-induced damage for ps to ns laser pulses and for mechanisms for laser-induced damage initiation.

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Citation Download Citation

Ted A. Laurence, C. W. Carr, Eyal Feigenbaum, Sonny Ly, and Raluca Negres "Potential implications of environmental effects of ps and ns laser-induced damage for damage initiation mechanisms", Proc. SPIE PC12726, Laser-Induced Damage in Optical Materials 2023, PC127260J (24 November 2023); https://doi.org/10.1117/12.2684097

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KEYWORDS

Laser induced damage

Picosecond phenomena

Laser optics

Oxygen

Polarization

Pulsed laser operation

Silica

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