Study of the picosecond laser damage in HfO2/SiO20based thin-film coatings in vacuum

A. A. Kozlov; S. Papernov; J. B. Oliver; A. Rigatti; B. Taylor; B. Charles; C. Smith

doi:10.1117/12.2242832

13 January 2017 Study of the picosecond laser damage in HfO₂/SiO₂-based thin-film coatings in vacuum

A. A. Kozlov, S. Papernov, J. B. Oliver, A. Rigatti, B. Taylor, B. Charles, C. Smith

Proceedings Volume 10014, Laser-Induced Damage in Optical Materials 2016; 100141Y (2017) https://doi.org/10.1117/12.2242832
Event: SPIE Laser Damage, 2016, Boulder, Colorado, United States

Abstract

The laser damage thresholds of various HfO₂/SiO₂-based thin film coatings, including multilayer dielectric (MLD) gratings and high reflectors of different designs, prepared by E-beam and Plasma Ion Assisted Deposition (PIAD) methods, were investigated in vacuum, dry nitrogen, and after air-vacuum cycling. Single and multiple-pulse damage thresholds and their pulse-length scaling in the range of 0.6 to 100 ps were measured using a vacuum damage test station operated at 1053nm. The E-beam deposited high reflectors showed higher damage thresholds with square-root pulse-length scaling, as compared to PIAD coatings, which typically show slower power scaling. The former coatings appeared to be not affected by air/vacuum cycling, contrary to PIAD mirrors and MLD gratings. The relation between 1-on-1 and N-on-1 damage thresholds was found dependent on coating design and deposition methods.

Citation Download Citation

A. A. Kozlov, S. Papernov, J. B. Oliver, A. Rigatti, B. Taylor, B. Charles, and C. Smith "Study of the picosecond laser damage in HfO₂/SiO₂-based thin-film coatings in vacuum", Proc. SPIE 10014, Laser-Induced Damage in Optical Materials 2016, 100141Y (13 January 2017); https://doi.org/10.1117/12.2242832

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