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TMI investigations of very low NA Yb-doped fibers and scaling to extreme stable 4.4 kW single-mode output

: Beier, F.; Möller, F.; Nold, J.; Sattler, B.; Kuhn, S.; Hupel, C.; Hein, S.; Haarlammert, N.; Schreiber, T.; Eberhardt, R.; Tünnermann, A.


Optical Society of America -OSA-, Washington/D.C.:
Advanced Solid State Lasers : Part of Laser Congress; 1-5 October 2017, Nagoya, Aichi, Japan
Washington, DC: OSA, 2017 (OSA Technical digest series)
ISBN: 978-0-9600380-7-7
Paper ATu3A.2
Advanced Solid State Lasers Conference (ASSL) <2017, Nagoya>
Laser Congress <2017, Nagoya>
Fraunhofer IOF ()

We present our recent results of scaling low-NA fibers to high average power by overcoming the TMI-limitations. We obtained a record output power of 4.4kW with a higher stability and smaller bending compared to our previous result.