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Proceedings Paper

Investigation in oxide mixture coatings with adapted gradient index profiles
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Paper Abstract

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.

Paper Details

Date Published: 31 December 2009
PDF: 9 pages
Proc. SPIE 7504, Laser-Induced Damage in Optical Materials: 2009, 75040B (31 December 2009); doi: 10.1117/12.836462
Show Author Affiliations
Kai Starke, Cutting Edge Coatings GmbH (Germany)
Laser Zentrum Hannover e.V. (Germany)
Lars O. Jensen, Laser Zentrum Hannover e.V. (Germany)
Marco Jupé, Laser Zentrum Hannover e.V. (Germany)
Detlev Ristau, Laser Zentrum Hannover e.V. (Germany)
Giedrius Abromavicius, Institute of Physics (Lithuania)
Optida Co. Ltd. (Lithuania)
Kestutis Juskevicius, Institute of Physics (Lithuania)
Rytis Buzelis, Institute of Physics (Lithuania)
Ramutis Drazdys, Institute of Physics (Lithuania)
Optida Co. Ltd. (Lithuania)

Published in SPIE Proceedings Vol. 7504:
Laser-Induced Damage in Optical Materials: 2009
Gregory J. Exarhos; Vitaly E. Gruzdev; Detlev Ristau; M. J. Soileau; Christopher J. Stolz, Editor(s)

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