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Proceedings Paper

Multi-kW cw fiber oscillator pumped by wavelength stabilized fiber coupled diode lasers
Author(s): Frank Becker; Benjamin Neumann; Lutz Winkelmann; Steffen Belke; Stefan Ruppik; Ulrich Hefter; Bernd Köhler; Paul Wolf; Jens Biesenbach
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Paper Abstract

High power Yb doped fiber laser sources are beside CO2- and disk lasers one of the working horses of industrial laser applications. Due to their inherently given robustness, scalability and high efficiency, fiber laser sources are best suited to fulfill the requirements of modern industrial laser applications in terms of power and beam quality. Pumping Yb doped single-mode fiber lasers at 976nm is very efficient. Thus, high power levels can be realized avoiding limiting nonlinear effects like SRS. However the absorption band of Yb doped glass around 976nm is very narrow. Therefore, one has to consider the wavelength shift of the diode lasers used for pumping. The output spectrum of passively cooled diode lasers is mainly defined by the applied current and by the heat sink temperature. Furthermore the overall emission line width of a high power pump source is dominated by the large number of needed diode laser emitters, each producing an individual spectrum. Even though it is possible to operate multi-kW cw single-mode fiber lasers with free running diode laser pumps, wavelength stabilizing techniques for diode lasers (e.g. volume holographic gratings, VHG) can be utilized in future fiber laser sources to increase the output power level while keeping the energy consumption constant. To clarify the benefits of wavelength stabilized diode lasers with integrated VHG for wavelength locking the performance of a dual side pumped fiber oscillator is discussed in this article. For comparison, different pumping configurations consisting of stabilized and free-running diode lasers are presented.

Paper Details

Date Published: 26 February 2013
PDF: 9 pages
Proc. SPIE 8601, Fiber Lasers X: Technology, Systems, and Applications, 860131 (26 February 2013); doi: 10.1117/12.2004698
Show Author Affiliations
Frank Becker, ROFIN-SINAR Laser GmbH (Germany)
Benjamin Neumann, ROFIN-SINAR Laser GmbH (Germany)
Lutz Winkelmann, ROFIN-SINAR Laser GmbH (Germany)
Steffen Belke, ROFIN-SINAR Laser GmbH (Germany)
Stefan Ruppik, ROFIN-SINAR Laser GmbH (Germany)
Ulrich Hefter, ROFIN-SINAR Laser GmbH (Germany)
Bernd Köhler, DILAS Diodenlaser GmbH (Germany)
Paul Wolf, DILAS Diodenlaser GmbH (Germany)
Jens Biesenbach, DILAS Diodenlaser GmbH (Germany)


Published in SPIE Proceedings Vol. 8601:
Fiber Lasers X: Technology, Systems, and Applications
Sami T. Hendow, Editor(s)

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