STP1117

    1-on-1 And n-on-1 Laser Strength of Binder Aided ZrO2 and ZrO2-SiO2 Reflective Sol-Gel Coatings

    Published: Jan 1990


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    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 laserannealing post-treatment, n-on-1 threshold values were higher than the 1-on-1 figures by a factor of about 1.5.

    Keywords:

    Laser damage, ZrO, 2, zirconia-silica coatings, sol, binder, HR-coatings, sol-gel coatings


    Author Information:

    Floch, HG
    Commissariat à l'Energie Atomique Centre d'Etudes de Limeil-Valenton, Villeneuve Saint Geroges,

    Priotton, JJ
    Commissariat à l'Energie Atomique Centre d'Etudes de Limeil-Valenton, Villeneuve Saint Geroges,


    Paper ID: STP26516S

    Committee/Subcommittee: E13.15

    DOI: 10.1520/STP26516S


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