Extraction of more than 10 kW from a single ytterbium-doped MM-fiber

M. Ackermann; G. Rehmann; R. Lange; U. Witte; F. Safarzadeh; B. Boden; H. Weber; D. Netz; C. Perne; A. Kösters; V. Krause

doi:10.1117/12.2509307

7 March 2019 Extraction of more than 10 kW from a single ytterbium-doped MM-fiber

M. Ackermann, G. Rehmann, R. Lange, U. Witte, F. Safarzadeh, B. Boden, H. Weber, D. Netz, C. Perne, A. Kösters, V. Krause

Author Affiliations +

Proceedings Volume 10897, Fiber Lasers XVI: Technology and Systems; 1089717 (2019) https://doi.org/10.1117/12.2509307
Event: SPIE LASE, 2019, San Francisco, California, United States

Abstract

High-power fiber lasers have become one of the most important tools for material processing in the last decade. Laserline GmbH, which is primarily known for its multi-kilowatt direct-diode lasers, also introduced a fiber-laser platform as a brightness converter for its direct-diode lasers a few years ago. Currently, output powers up to 6 kW at beam qualities down to 4 mm mrad are commercially available. The platform is based on a single directly water-cooled ytterbium doped XLMA (extra-large mode area) fiber in an end-pumped configuration, which can easily be combined in series with a standard diode laser. In this paper, we present the latest progress in power scaling of our fiber-laser system. By improving the material properties of the active fiber, the thermal management and the thermo-mechanical stability of the resonator, up to 10 kW output power from a single, unidirectionally pumped fiber-laser oscillator with a beam parameter product in the range of 4 mm mrad to 8 mm mrad is demonstrated. Further power scaling up to 17.5 kW with 8 mm mrad was achieved by bidirectional pumping of the active fiber. In both cases, a rather high optical conversion efficiency of 75-77 % leads to a wall-plug efficiency of ~35 % for the whole laser system. Currently, we do not observe any physical limits, such as nonlinear effects for example.

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M. Ackermann, G. Rehmann, R. Lange, U. Witte, F. Safarzadeh, B. Boden, H. Weber, D. Netz, C. Perne, A. Kösters, and V. Krause "Extraction of more than 10 kW from a single ytterbium-doped MM-fiber", Proc. SPIE 10897, Fiber Lasers XVI: Technology and Systems, 1089717 (7 March 2019); https://doi.org/10.1117/12.2509307

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