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Proceedings Paper

Mitigation of mode instabilities by dynamic excitation of fiber modes
Author(s): Hans-Jürgen Otto; Cesar Jauregui; Fabian Stutzki; Florian Jansen; Jens Limpert; Andreas Tünnermann
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Paper Abstract

By dynamically varying the power content of the excited fiber modes of the main amplifier of a fiber-based MOPA system at high average output power levels, it was possible to mitigate mode instabilities to a large extent. In order to achieve the excitation variation, we used an acousto-optic deflector in front of the Yb-doped rod-type fiber. Therewith, it was possible to significantly increase both the average and the instantaneous minimum power content of the fundamental mode. This, consequently, led to a substantial improvement of the beam quality and pointing stability at power levels well beyond the threshold of mode instabilities.

Paper Details

Date Published: 22 March 2013
PDF: 7 pages
Proc. SPIE 8601, Fiber Lasers X: Technology, Systems, and Applications, 86010A (22 March 2013); doi: 10.1117/12.2003837
Show Author Affiliations
Hans-Jürgen Otto, Friedrich-Schiller-Univ. Jena (Germany)
Cesar Jauregui, Friedrich-Schiller-Univ. Jena (Germany)
Fabian Stutzki, Friedrich-Schiller-Univ. Jena (Germany)
Florian Jansen, Friedrich-Schiller-Univ. Jena (Germany)
Jens Limpert, Friedrich-Schiller-Univ. Jena (Germany)
Helmholtz-Institut Jena (Germany)
Andreas Tünnermann, Friedrich-Schiller-Univ. Jena (Germany)
Helmholtz-Institut Jena (Germany)
Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)

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

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