4 December 2012 Coatings of oxide composites
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During the last decade, coating processes have been extended to the reproducible deposition of composite materials on the basis of simultaneous evaporation or sputtering. Especially, ion beam sputtering from a zone target in conjunction with sophisticated optical broadband monitoring offers several advantages for the production of oxide coatings with defined mixture ratios and even Rugate filter systems with a continuous variation of the composition ratio in the depth of the layer structure. With only two materials on the zone targets, a large dynamic range of refractive index values covering the indices of the pure materials can be achieved. Recent studies on the properties of the produced oxide composites indicate a variety of interesting aspects opened by this new class of material. Among others, a blue shift of the absorption characteristic was observed for ternary oxides, and an increased LIDT, particularly for sub-picosecond coatings, has been reported. Also a number of investigations of fundamental damage mechanisms could be carried out by considering the tunable band gap energy of the coating material. In this endeavor, a group of international collaborators joined in modeling, testing and evaluating the properties of a variety of ternary oxide systems. A verification of principal material qualities was transferred to applicable multilayer coatings in a combined effort. In this paper, an overview on the achievements of these current studies is presented before the background of high power laser applications.
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Lars O. Jensen, Lars O. Jensen, Detlev Ristau, Detlev Ristau, } "Coatings of oxide composites", Proc. SPIE 8530, Laser-Induced Damage in Optical Materials: 2012, 853013 (4 December 2012); doi: 10.1117/12.981526; https://doi.org/10.1117/12.981526

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