13 October 1994 Sol-gel broadband antireflective coatings for advanced laser-glass amplifiers
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The cost of a large laser system is a strong function of the overall electrical to final photon efficiency. To improve the stored energy and therefore the pumping efficiency of sophisticated and costly laser-glass amplifiers, we have developed a novel two-layer broadband antireflective coating for the blast-shield component. The blast-shield is an optic placed between the flashlamps and the laser disk amplifiers to prevent damage of laser disks by possible explosion of a flashlamp. The sol-gel antireflective coating was dip-coated at room temperature onto 8-cm diameter glass samples. The coating basically consisted of a halfwave- thick high-index material such as ZrO2-PVP (PolyVinyl Pyrrolidone) and a quarterwave- thick low-index material such as SiO2-siloxane. To improve the abrasion resistance of the coated part, a lubricating and water-repellent material was applied as a very thin overcoat. In addition to a 6.5 to 7.2% transmission gain over the spectrum of interest, the coating was moderately abrasion resistant and chemically durable. Flashlamp-induced damage to the antireflective coating for 1000 glow discharges at 10 to 12 J/cm2 were minimal and similar to uncoated parts.
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Herve G. Floch, Herve G. Floch, Philippe F. Belleville, Philippe F. Belleville, Philippe M. Pegon, Philippe M. Pegon, } "Sol-gel broadband antireflective coatings for advanced laser-glass amplifiers", Proc. SPIE 2288, Sol-Gel Optics III, (13 October 1994); doi: 10.1117/12.188947; https://doi.org/10.1117/12.188947

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