Time-resolved measurements of reflectivity, plasma formation, and damage of hafnia/silica multilayer mirrors at 1064 nm

Laurent Lamaignere; V. Cavarro; C. Allais; D. Bernardino; Michel A. Josse; Herve Bercegol

doi:10.1117/12.461686

9 April 2002 Time-resolved measurements of reflectivity, plasma formation, and damage of hafnia/silica multilayer mirrors at 1064 nm

Laurent Lamaignere, V. Cavarro, C. Allais, D. Bernardino, Michel A. Josse, Herve Bercegol

Author Affiliations +

Proceedings Volume 4679, Laser-Induced Damage in Optical Materials: 2001; (2002) https://doi.org/10.1117/12.461686
Event: Boulder Damage, 2001, Boulder, CO, United States

Abstract

High damage threshold hafnia/silica HR mirrors were damage tested. The transient reflectivity of these mirrors was studied during laser irradiation and particularly during catastrophic damage by top layer chipping. The tests were performed in R/1 mode on 50 sites in order to correctly assess the statistical behavior of the damage threshold. During the ramp, we observed the formation of a first plasma coupled to a modification of the reflected pulse without formation of any pit or chipping damage. For further irradiations at higher fluences, the optical properties of the mirror were unchanged up to the creation of a catastrophic chipping damage coming with a more intense plasma. The statistical distributions of fluences obtained in the two cases were different. For the moment, there is no proven correlation between first plasma and chipping: plasma detection cannot be used as a nondestructive quality control.

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Laurent Lamaignere, V. Cavarro, C. Allais, D. Bernardino, Michel A. Josse, and Herve Bercegol "Time-resolved measurements of reflectivity, plasma formation, and damage of hafnia/silica multilayer mirrors at 1064 nm", Proc. SPIE 4679, Laser-Induced Damage in Optical Materials: 2001, (9 April 2002); https://doi.org/10.1117/12.461686

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