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1-on-1 And n-on-1 laser strength of binder aided ZrO2 and ZrO2-SiO2 reflective sol-gel coatings
Author(s): Hervé G. Floch
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Paper Abstract

In continuation to our search program on laser-damage resistant coatings and in synergy with the Lawrence Livermore National Laboratory, we have prepared porous single layer coatings of ZrO2 on fused silica and BK-7 substrates from suitable aqueous colloidal suspensions of crystalline zirconia at room temperature. By adding judiciously a soluble inorganic binder to the suspension prior to application, it has been possible to increase substantially both the coating refractive index and the abrasion-resistance. The optimum binder concentration was about 30 % and at this level the optical properties and laser damage threshold of the zirconia coating were satisfactory. Multilayer high reflectivity dielectric coatings were also elaborated by laying down quaterwave-thick, alternating coats of this binder-aided zirconia with silica, also prepared from colloidal suspension. To achieve 99 % reflectivity, 17-19 layers were required. Single shot (1- on-1), laser damage tests at 1064-nm wavelength with a pulse length of 3-ns were carried out on both the single layer and multilayer systems. The thresholds averaged 8.6 and 8.2 J/cm2 respectively. With a laser- annealing post-treatment, n-on-i threshold values were higher than the 1-on-1 figures by a factor of about 1.5.

Paper Details

Date Published: 2 October 2017
PDF: 19 pages
Proc. SPIE 1438, Laser-Induced Damage in Optical Materials 1989, 14381C (2 October 2017); doi: 10.1117/12.2294457
Show Author Affiliations
Hervé G. Floch, Commisariat à l'Energie Atomique, Ctr. d'Etudes de Limeil-Valenton (France)

Published in SPIE Proceedings Vol. 1438:
Laser-Induced Damage in Optical Materials 1989
Harold E. Bennett; Lloyd L. Chase; Arthur H. Guenther; Brian Emerson Newnam; M. J. Soileau, Editor(s)

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