Thulium-doped fiber laser with longitudinally segmented active fiber

Švejkarová, Bára, Grábner, Martin, Aubrecht, Jan, Švejkar, Richard, Pokorný, Jan, Kamrádek, Michal, Podrazký, Ondřej, Kašík, Ivan, Honzátko, Pavel, Clarkson, W. Andrew and Peterka, Pavel (2025) Thulium-doped fiber laser with longitudinally segmented active fiber. Peterka, Pavel, Kalli, Kyriacos, Ballato, John and Mendez, Alexis (eds.) In Eighth International Workshop on Specialty Optical Fibers and Their Applications (WSOF 2025). vol. 13522, SPIE. 4 pp . (doi:10.1117/12.3058227).

Abstract

Nowadays, one of the main challenges of thulium-doped fiber lasers is thermal management. One prospective method to significantly reduce thermal load density along the fiber is using a segmented active fiber or active fiber with a longitudinal gradient of thulium-doping concentration. Based on a theoretical model, the laser design with a segmented active fiber was proposed and initial measurements and tests were done. It was achieved 30 W of stable output power at 1940 nm with a launched slope efficiency exceeding 60 %, and better heat distribution along the fiber than in uniformly doped lasers.

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Contributors

Author: Richard Švejkar

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