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Proceedings Paper

Single mode low-NA step index Yb-doped fiber design for output powers beyond 4kW (Conference Presentation)
Author(s): Franz Beier; Fritz Proske; Christian Hupel; Stefan Kuhn; Sigrun Hein; Bettina Sattler; Johannes Nold; Nicoletta Haarlammert; Thomas Schreiber; Ramona Eberhardt; Andreas Tünnermann
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Paper Abstract

Fiber amplifiers are representing one of the most promising solid state laser concepts, due to the compact setup size, a simple thermal management and furthermore excellent beam quality. In this contribution, we report on the latest results from a low-NA, large mode area single mode fiber with a single mode output power beyond 4 kW without any indication of mode instabilities or nonlinear effects and high slope efficiency. Furthermore, we quantify the influence of the bending diameter of our manufactured low NA fiber on the average core loss by an OFDR measurement and determine the optimal bending diameter in comparison to a second fiber with a slightly changed NA. The fibers used in the experiments were fabricated by MCVD technology combined with the solution doping technique. The investigation indicates the limitation of the step index fiber design and its influence on the use in high power fiber amplifiers. We demonstrate, that even a slightly change in the core NA crucially influences the minimum bending diameter of the fiber and has to be taken into account in applications. The measured output power represents to the best of our knowledge the highest single mode output power of an amplifier fiber ever reported on.

Paper Details

Date Published: 21 April 2017
PDF: 1 pages
Proc. SPIE 10083, Fiber Lasers XIV: Technology and Systems, 100830Z (21 April 2017); doi: 10.1117/12.2256038
Show Author Affiliations
Franz Beier, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
Friedrich-Schiller-Univ. Jena (Germany)
Fritz Proske, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
Christian Hupel, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
Stefan Kuhn, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
Sigrun Hein, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
Bettina Sattler, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
Johannes Nold, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
Nicoletta Haarlammert, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
Thomas Schreiber, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
Ramona Eberhardt, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
Andreas Tünnermann, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
Friedrich-Schiller-Univ. Jena (Germany)


Published in SPIE Proceedings Vol. 10083:
Fiber Lasers XIV: Technology and Systems
Craig A. Robin; Ingmar Hartl, Editor(s)

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