Scaling the mode instability threshold with multicore fibers

Abstract

Mode instabilities (MIs) have quickly become the most limiting effect for the average power scaling of nearly diffraction-limited beams from state-of-the-art fiber laser systems. In this work it is shown that, by using an advanced multicore photonic crystal fiber design, the threshold power of MIs can be increased linearly with the number of cores. An average output power of 536 W, corresponding to 4 times the threshold power of a single core, is demonstrated.

© 2014 Optical Society of America

Impact of photodarkening on the mode instability threshold

Hans-Jürgen Otto, Norbert Modsching, Cesar Jauregui, Jens Limpert, and Andreas Tünnermann
Opt. Express 23(12) 15265-15277 (2015)

Passive mitigation strategies for mode instabilities in high-power fiber laser systems

Cesar Jauregui, Hans-Jürgen Otto, Fabian Stutzki, Florian Jansen, Jens Limpert, and Andreas Tünnermann
Opt. Express 21(16) 19375-19386 (2013)

Pump-modulation-induced beam stabilization in high-power fiber laser systems above the mode instability threshold

Cesar Jauregui, Christoph Stihler, Andreas Tünnermann, and Jens Limpert
Opt. Express 26(8) 10691-10704 (2018)

Physical origin of mode instabilities in high-power fiber laser systems

Cesar Jauregui, Tino Eidam, Hans-Jürgen Otto, Fabian Stutzki, Florian Jansen, Jens Limpert, and Andreas Tünnermann
Opt. Express 20(12) 12912-12925 (2012)

Beam quality degradation of a single-frequency Yb-doped photonic crystal fiber amplifier with low mode instability threshold power

Malte Karow, Henrik Tünnermann, Jörg Neumann, Dietmar Kracht, and Peter Weßels
Opt. Lett. 37(20) 4242-4244 (2012)