Experimental Investigations on the TMI Thresholds of Low-NA Yb-doped single mode fibers

no code implementations • 29 Jan 2021 • Franz Beier, Friedrich Moeller, Bettina Sattler, Johannes Nold, Andreas Liem, Christian Hupel, Stefan Kuhn, Sigrun Hein, Nicoletta Haarlammert, Thomas Schreiber, Ramona Eberhardt, Andreas Tuennermann

In this contribution we investigate the transversal mode instability behavior of an ytterbium doped commercial 20/400 fiber and obtain 2. 9 kW of output power after optimizing the influencing parameters.

Optics

Measuring Thermal Load in Fiber Amplifiers in the Presence of Transversal Mode Instabilities

no code implementations • 29 Jan 2021 • Franz Beier, Marco Plötner, Bettina Sattler, Fabian Stutzki, Till Walbaum, Andreas Liem, Nicoletta Haarlammert, Thomas Schreiber, Ramona Eberhardt, Andreas Tünnermann

We report on detailed in-situ distributed temperature measurements inside a high power fiber amplifier.

Optics