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Proceedings Article

Applying hafnia mixtures to enhance the laser-induced damage threshold of coatings for third-harmonic generation optics

[+] Author Affiliations
Mathias Mende, Lars O. Jensen, Henrik Ehlers, Detlev Ristau

Laser Zentrum Hannover e.V. (Germany)

Stefan Bruns, Michael Vergöhl

Fraunhofer Institute for Surface Engineering and Thin Films (Germany)

Peer Burdack

InnoLight GmbH (Germany)

Proc. SPIE 8530, Laser-Induced Damage in Optical Materials: 2012, 85300W (December 6, 2012); doi:10.1117/12.971225
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From Conference Volume 8530

  • Laser-Induced Damage in Optical Materials: 2012
  • Gregory J. Exarhos; Vitaly E. Gruzdev; Joseph A. Menapace; Detlev Ristau; M J Soileau
  • Boulder, Colorado, USA | September 23, 2012

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. HfO<sub>2</sub>/SiO<sub>2</sub> 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 HfO<sub>2</sub>/SiO<sub>2</sub> 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.© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Citation

Mathias Mende ; Lars O. Jensen ; Henrik Ehlers ; Stefan Bruns ; Michael Vergöhl, et al.
"Applying hafnia mixtures to enhance the laser-induced damage threshold of coatings for third-harmonic generation optics", Proc. SPIE 8530, Laser-Induced Damage in Optical Materials: 2012, 85300W (December 6, 2012); doi:10.1117/12.971225; http://dx.doi.org/10.1117/12.971225


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