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Proceedings Paper

Applying hafnia mixtures to enhance the laser-induced damage threshold of coatings for third-harmonic generation optics
Author(s): Mathias Mende; Lars O. Jensen; Henrik Ehlers; Stefan Bruns; Michael Vergöhl; Peer Burdack; Detlev Ristau
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Paper Abstract

The generation of third harmonic radiation (THG) is required for many pulsed solid-state laser applications in industry and science. In this contribution, the coatings for two necessary optical components, dichroic mirrors and nonlinear optical (NLO) crystals are in the focus of investigation. Because of the high bulk damage threshold lithium triborate (LBO) crystals are applied for this study. HfO2/SiO2 mixtures are employed as high refractive index material to improve the power handling capability of the multilayers. All coatings are produced by ion beam sputtering (IBS) using a zone target assembly for the deposition of material mixtures. The atomic composition and the oxidation ratio of different HfO2/SiO2 mixtures are analyzed by X-ray photoelectron spectroscopy (XPS). The influence of different deposition temperatures and post annealing on the optical properties and the amorphous micro structure of the films is investigated by UV/Vis/NIR spectroscopy and X-ray diffraction (XRD). The laser induced damage thresholds at 355 nm wavelength for nanosecond pulse durations are measured in a 10,000on1 experiment according with the standard ISO21254. Furthermore, the optical components are tested under real application conditions.

Paper Details

Date Published: 4 December 2012
PDF: 8 pages
Proc. SPIE 8530, Laser-Induced Damage in Optical Materials: 2012, 85300W (4 December 2012); doi: 10.1117/12.971225
Show Author Affiliations
Mathias Mende, Laser Zentrum Hannover e.V. (Germany)
Lars O. Jensen, Laser Zentrum Hannover e.V. (Germany)
Henrik Ehlers, Laser Zentrum Hannover e.V. (Germany)
Stefan Bruns, Fraunhofer Institute for Surface Engineering and Thin Films (Germany)
Michael Vergöhl, Fraunhofer Institute for Surface Engineering and Thin Films (Germany)
Peer Burdack, InnoLight GmbH (Germany)
Detlev Ristau, Laser Zentrum Hannover e.V. (Germany)
Ctr. of Quantum Engineering and Space-Time Research (Germany)

Published in SPIE Proceedings Vol. 8530:
Laser-Induced Damage in Optical Materials: 2012
Gregory J. Exarhos; Vitaly E. Gruzdev; Joseph A. Menapace; Detlev Ristau; M J Soileau, Editor(s)

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