Investigation of transverse mode instability threshold on the modal contents of the seed light in fiber amplifiers

Yiming Tu; Cesar Jauregui; Jens Limpert

doi:10.1117/12.3005326

12 March 2024 Investigation of transverse mode instability threshold on the modal contents of the seed light in fiber amplifiers

Yiming Tu, Cesar Jauregui, Jens Limpert

Author Affiliations +

Proceedings Volume 12865, Fiber Lasers XXI: Technology and Systems; 1286503 (2024) https://doi.org/10.1117/12.3005326
Event: SPIE LASE, 2024, San Francisco, California, United States

Abstract

We experimentally investigate the impact of the modal content of the seed beam on the Transverse Mode Instability (TMI) threshold in high-power fiber amplifiers. Theoretical models have predicted that the TMI threshold should decrease with Higher-Order Mode (HOM) content in the seed. However no systematic experiment has been done so far to probe such a statement. In this work we have built a system comprising a spatial mode multiplexer that allows manipulating the power content of the Fundamental Mode (FM) and the HOM in the seed beam. Such beams, with the same power but different modal contents, were coupled into a multimode active rod-type fiber and the evolution of the TMI threshold was studied.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Yiming Tu, Cesar Jauregui, and Jens Limpert "Investigation of transverse mode instability threshold on the modal contents of the seed light in fiber amplifiers", Proc. SPIE 12865, Fiber Lasers XXI: Technology and Systems, 1286503 (12 March 2024); https://doi.org/10.1117/12.3005326

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