Investigation in oxide mixture coatings with adapted gradient index profiles
Laser Damage Symposium XLI: Annual Symposium on Optical Materials for High Power Lasers(2009)
摘要
The stability of thin film coatings for applications especially in the UV spectral range is oftentimes a limiting factor in
the further development of radiation sources and beam delivery systems. Particularly, functional coatings on laser and
conversions crystals as well as resonator mirrors show an insufficient lifetime due to laser-induced degradation. Previous
investigations in the power handling capability of UV coatings mostly concentrate on the properties of pure oxide
materials and particle mitigation.
Recent innovations in ion beam sputtering technology enabled efficient deposition of mixture coatings of different oxide
materials. In combination with an advanced thickness monitoring equipment, the described IBS deposition systems are
capable of employing designs with sub-layers of a few nm thickness. In the present investigation, the stability of classical
designs using pure oxide materials is compared with gradient index design concepts based on mixture materials.
Reflecting and transmitting thin film coatings employing classical and gradient index approaches manufactured under
comparable conditions are characterized in respect to their power handling capability. The results are analyzed before the
background of theoretical expectations regarding contributions from field enhancement and absorptance effects.
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关键词
resonators,particles,ion beam,indexation,optical coatings,lasers,sputter deposition,crystals,limiting factor,radiation,thin film
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