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Proceedings Paper

Monocrystalline CVD-diamond optics for high-power laser applications
Author(s): C. Holly; M. Traub; D. Hoffmann; C. Widmann; D. Brink; C. Nebel; T. Gotthardt; M. C. Sözbir; C. Wenzel
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Paper Abstract

The potential of diamond as an optical material for high-power laser applications in the wavelength regime from the visible spectrum (VIS) to the near infrared (NIR) is investigated. Single-crystal diamonds with lateral dimensions up to 7×7mm2 are grown with microwave plasma assisted chemical vapor deposition (MPACVD) in parallel with up to 60 substrates and are further processed to spherical optics for beam guidance and shaping. The synthetic diamonds offer superior thermal, mechanical and optical properties, including low birefringence, scattering and absorption, also around 1 μm wavelength. We present dielectric (AR and HR) coated single-crystal diamond optics which are tested under high laser power in the multi-kW regime. The thermally induced focal shift of the diamond substrates is compared to the focal shift of a standard collimating and focusing unit for laser cutting made of fused silica optics. Due to the high thermal conductivity and low absorption of the diamond substrates compared to the fused silica optics no additional focal shift caused by a thermally induced refractive index change in the diamond is observed in our experiments. We present experimental results regarding the performance of the diamond substrates with and without dielectric coatings under high power and the influences of growth induced birefringence on the optical quality. Finally, we discuss the potential of the presented diamond lenses for high-power applications in the field of laser materials processing.

Paper Details

Date Published: 18 March 2016
PDF: 9 pages
Proc. SPIE 9741, High-Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications V, 974104 (18 March 2016); doi: 10.1117/12.2213601
Show Author Affiliations
C. Holly, RWTH Aachen Univ. (Germany)
M. Traub, Fraunhofer-Institut für Lasertechnik (Germany)
D. Hoffmann, Fraunhofer-Institut für Lasertechnik (Germany)
C. Widmann, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
D. Brink, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
C. Nebel, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
T. Gotthardt, Fraunhofer-Institut für Produktionstechnologie (Germany)
M. C. Sözbir, Fraunhofer-Institut für Produktionstechnologie (Germany)
C. Wenzel, Fraunhofer-Institut für Produktionstechnologie (Germany)


Published in SPIE Proceedings Vol. 9741:
High-Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications V
Friedhelm Dorsch; Stefan Kaierle, Editor(s)

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