Mitigation of transverse mode instability in large mode area polarization maintaining fibers

Gonzalo Palma-Vega; Denny Hässner; Stefan Kuhn; Friedrich Möller; César Jáuregui; Nicoletta Haarlammert; Thomas Schreiber

doi:10.1117/12.2650342

8 March 2023 Mitigation of transverse mode instability in large mode area polarization maintaining fibers

Gonzalo Palma-Vega, Denny Hässner, Stefan Kuhn, Friedrich Möller, César Jáuregui, Nicoletta Haarlammert, Thomas Schreiber

Author Affiliations +

Proceedings Volume 12400, Fiber Lasers XX: Technology and Systems; 124000U (2023) https://doi.org/10.1117/12.2650342
Event: SPIE LASE, 2023, San Francisco, California, United States

Abstract

In this work we present experimental results of transverse mode instabilities in dependence of the polarization input angle in a large-mode area polarization maintaining fiber amplifier. The transverse mode instabilities threshold was found at 300 W for an input polarization angle aligned parallel to the slow-axis. We demonstrate that at a constant output power of 300 W the temporal stability can significantly be improved by rotating the input polarization angle with respect the slow-axis, indicating an increased threshold. This allowed for further scaling of the fiber amplifier for linear polarization input angles detuned from the slow-axis of the fiber. For operation in the fast-axis (90° to the slow-axis), the power was scaled to up to 475 W without the onset of transverse mode instabilities. However, a static energy transfer from the fast-axis into the slow-axis was observed at powers above 400 W.

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Citation Download Citation

Gonzalo Palma-Vega, Denny Hässner, Stefan Kuhn, Friedrich Möller, César Jáuregui, Nicoletta Haarlammert, and Thomas Schreiber "Mitigation of transverse mode instability in large mode area polarization maintaining fibers", Proc. SPIE 12400, Fiber Lasers XX: Technology and Systems, 124000U (8 March 2023); https://doi.org/10.1117/12.2650342

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