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Proceedings Paper

Manipulating the heat load distribution by laser gain competition in TMI-limited fiber amplifiers
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Paper Abstract

Supported by both experimental and simulated results, this contribution demonstrates the heat load distribution in a co-pumped, ytterbium (Yb)-doped fiber amplifier seeded with two different wavelengths can be significantly changed depending on the seed power ratio. Longitudinal temperature measurements in a Yb-doped 10.5 m 20/400 μm fiber confirm a significant shift of the heat load maximum by 3.5 m towards the fiber output when decreasing the seed power ratio from P1030nm/P1080nm = 1.7 to 20. In single-tone operation with a seed power of P1080nm = 3.5 W, the amplifier is limited by the onset of transverse mode instabilities at a power-level of 1950 W. However, dual-tone seeding with a seed power ratio up to P1030nm/P1080nm = 10 reduces the TMI-threshold dramatically down to 1050 W. Additionally we show, that the modal instability threshold is very susceptible to 1030 nm seed noise in the frequency regime up to 10 kHz.

Paper Details

Date Published: 21 February 2020
PDF: 8 pages
Proc. SPIE 11260, Fiber Lasers XVII: Technology and Systems, 1126019 (21 February 2020); doi: 10.1117/12.2545951
Show Author Affiliations
Friedrich Möller, Fraunhofer-Institut für Angewandte Optik und Feinmechanik IOF (Germany)
Victor Distler, Fraunhofer-Institut für Angewandte Optik und Feinmechanik IOF (Germany)
Friedrich-Schiller-Univ. Jena (Germany)
Thomas Schreiber, Fraunhofer-Institut für Angewandte Optik und Feinmechanik IOF (Germany)
Ramona Eberhardt, Fraunhofer-Institut für Angewandte Optik und Feinmechanik IOF (Germany)
Andreas Tünnermann, Fraunhofer-Institut für Angewandte Optik und Feinmechanik IOF (Germany)
Friedrich-Schiller-Univ. Jena (Germany)


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

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