9 April 2002 Influence of storage conditions on the LIDT of very high damage resistance mirrors
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Abstract
Contamination of surfaces prior to or during deposition of dielectric multilayers has been a classical subject of technological studies, but post deposition contamination has not been reported as often. Previous results typically dealt with sealed optics and exposition to laser or UV conditions, or on-orbit optical systems: we report here observations on HfO2/SiO2 mirrors designed for the Megajoules project, with very high laser resistance. Performances in terms of laser damage thresholds at 1.06 micrometers have been measured periodically over periods of several months, on different sets of samples. Comparison of R/1 LIDT distributions are presented versus time and storage conditions. Degradation of LIDT is clearly observed. Recovery methods are investigated.
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Guillaume Ravel, Philippe Bouchut, Pierre Garrec, Bernard Andre, Carol Le Diraison, Herve Bercegol, "Influence of storage conditions on the LIDT of very high damage resistance mirrors", Proc. SPIE 4679, Laser-Induced Damage in Optical Materials: 2001, (9 April 2002); doi: 10.1117/12.461684; https://doi.org/10.1117/12.461684
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