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12 April 2001 Room-temperature mirror preparation using sol-gel chemistry and laminar-flow coating technique
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The CEA/DAM megajoule-class pulsed Nd:glass laser devoted to Inertial Confinement Fusion (ICF) research is requiring 240 cavity-end mirrors. The mirror design is based on 44-cm square highly-reflective (HR)-coated deformable substrates. Such large dielectric mirrors are using interference quarterwave stacks of SiO2 and ZrO2-PVP (PolyVinylPyrrolidone) thin films starting from sol-gel colloidal suspensions (sols). The colloidal/polymeric ratio of the ZrO2-PVP composite system has been optimized regarding refractive index value, laser damage threshold and chemical interactions have been studied using FT-IR spectroscopy. Therefore a promising deposition technique so- called Laminar Flow Coating (LFC) has been associated to sol-gel chemistry for HR sol-gel coating development. The as-designed LFC prototype machine has been used for coating solution wave deposition by transportation of a tubular dispense unit under the substrate flat surface. Thin film so created by the solvent evaporation was then dried at room temperature or using short wavelength UV-curing built-in station. Optimization of parameters such as optical layer number, coating uniformity, coating edge effect, 1053-nm reflectance and laser damage threshold is discussed. Demonstration has been made that this novel coating method is a competitive way for large-area optical deposition compared to dipping or spinning techniques. Association of sol-gel colloidal suspensions to LFC process appear to be a promising cheap way of producing high power laser optical coatings.
© (2001) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Philippe F. Belleville, Claude Bonnin, Eric Lavastre, Philippe Pegon, and Yannick Rorato "Room-temperature mirror preparation using sol-gel chemistry and laminar-flow coating technique", Proc. SPIE 4347, Laser-Induced Damage in Optical Materials: 2000, (12 April 2001);

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