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  • 1
    Digitale Medien
    Digitale Medien
    Sol-Gel Processing of Zirconia Coating for HR Mirrors with High Laser Damage Threshold (2000)
    Springer
    Journal of sol gel science and technology 19 (2000), S. 271-274 
    Details
    ISSN: 1573-4846
    Schlagwort(e): sol-gel processing ; HR coatings ; ZrO2 ; hydrothermal synthesis ; laser damage threshold
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract High laser-damage resistant coatings are very important in high power laser systems. In this study ZrO2 thin films are prepared by sol-gel spin-coating technology from suitable zirconia aqueous colloidal suspensions containing nano-crystalline ZrO2 at room temperature synthesized by a hydrothermal process from an inorganic precursor (ZrOCl2·8H2O). By adding a soluble organic binder PVP to the suspension prior to application, it is possible to substantially increase the coating refractive index and the abrasion-resistance as well as the laser damage threshold. The features of the coatings and the colloidal suspensions are investigated. Multilayer highly reflective dielectric coatings are also elaborated by applying quarterwave-thick alternating coatings of the binder-aided zirconia and silica, which is prepared with the sol-gel process from TEOS. To achieve 99% reflectivity, 19–21 layers are required. Single shot laser damage tests are carried out using a high power laser at 1064 nm wavelength with a pulse duration of 2.5 ns. The laser damage thresholds of 18 and 15 J/cm2 are achieved for single ZrO2-PVP coating and ZrO2-PVP/SiO2 multilayers respectively.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1008761010781
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Scratch-Resistant Improvement of Sol-Gel Derived Nano-Porous Silica Films (2000)
    Springer
    Journal of sol gel science and technology 18 (2000), S. 219-224 
    Details
    ISSN: 1573-4846
    Schlagwort(e): sol-gel process ; silica film ; AFM ; refractive index
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Scratch-resistance of sol-gel derived nano porous silica films were studied. The thin films were prepared with a dip-coating method from both one-step and two-step catalyzed silica sols, and treated in a mixture gas of ammonia and water vapour afterwards. The thin films were characterized by using Atomic Force Microscope (AFM), ellipsometer, Fourier-transform Infrared Spectroscope (FTIR), respectively. Experimental results have shown that the two-step catalysis remarkably improves strength of the films, and abrasion-resistance and adhesion of the silica films were further increased after the mixture gas treatment. It is attributed to the cross-linking of silica particles in the sols by randomly branched or/and entangled linear chains and more Si–O–Si bonds formed by the mixture gas treatment.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1008787722437
    Standort Signatur Erwartet Verfügbarkeit
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