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Proceedings Paper

High power narrow-linewidth Raman amplifier and its limitation
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Paper Abstract

We investigated the limitations in output power generated by a high power narrow-linewidth Raman fiber amplifier. The pump was produced by a kW-level all-fiber Yb-doped amplifier emitting at 1060 nm, whose seed linewidth could be changed. The Raman seed was a narrow-linewidth signal at 1110 nm co-propagating with the laser at 1060 nm. The main Raman conversion occurred in the passive fiber at the amplifier output. We identified cross-phase modulation (XPM) as a main reason for broadening of the Raman light by using different pump sources, which is a first limitation. An improved setup was limited at approximately 600 W of Stokes output power by a threshold-like onset of a transverse mode instability. Since the instability was not observed without a Stokes seed and the temperatures of the active fiber with and without Stokes seed are equal, this constitutes the first direct observation of transverse mode instabilities (TMI) induced by SRS in a passive fiber.

Paper Details

Date Published: 21 February 2020
PDF: 6 pages
Proc. SPIE 11260, Fiber Lasers XVII: Technology and Systems, 1126005 (21 February 2020); doi: 10.1117/12.2544622
Show Author Affiliations
Victor Distler, Fraunhofer-Institut für Angewandte Optik und Feinmechanik IOF (Germany)
Friedrich-Schiller Univ. (Germany)
Friedrich Möller, Friedrich-Schiller Univ. (Germany)
Maximilian Strecker, Friedrich-Schiller Univ. (Germany)
Gonzalo Palma-Vega, Fraunhofer-Institut für Angewandte Optik und Feinmechanik IOF (Germany)
Friedrich-Schiller Univ. (Germany)
Till Walbaum, Friedrich-Schiller Univ. (Germany)
Thomas Schreiber, Friedrich-Schiller Univ. (Germany)
Andreas Tünnermann, Fraunhofer-Institut für Angewandte Optik und Feinmechanik IOF (Germany)
Friedrich-Schiller Univ. (Germany)


Published in SPIE Proceedings Vol. 11260:
Fiber Lasers XVII: Technology and Systems
Liang Dong, Editor(s)

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