Photodarkening-free fiber laser based on Yb-doped 20/400 gain fiber

A. Rosales-Garcia; R. Jensen; S. Ovtar; K. Ingerslev; B. Edvold; P. Kristensen; J. W. Nicholson; D. J. DiGiovanni; B. Pálsdóttir

doi:10.1117/12.2614616

4 March 2022 Photodarkening-free fiber laser based on Yb-doped 20/400 gain fiber

A. Rosales-Garcia, R. Jensen, S. Ovtar, K. Ingerslev, B. Edvold, P. Kristensen, J. W. Nicholson, D. J. DiGiovanni, B. Pálsdóttir

Author Affiliations +

Proceedings Volume 11981, Fiber Lasers XIX: Technology and Systems; 119810W (2022) https://doi.org/10.1117/12.2614616
Event: SPIE LASE, 2022, San Francisco, California, United States

Abstract

We report a new Yb-doped gain fiber with 20 µm core and 400 µm cladding, designed for improving the long-term operation of commercial fiber lasers powered by cost-effective pump diodes, centered near 976 nm wavelength. The fiber was tested in a co-pumped amplifier, reaching 3.8 kW signal power with 89% optical-to-optical efficiency. Negligible photodarkening loss was observed in over 200-hour laser operation at 2 kW. The signal power was limited to 3.8 kW by TMI and can be further increased by optimizing the pumping configuration. The fiber is compatible with available 20/400 commercial fibers and components allowing fast system integration.

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A. Rosales-Garcia, R. Jensen, S. Ovtar, K. Ingerslev, B. Edvold, P. Kristensen, J. W. Nicholson, D. J. DiGiovanni, and B. Pálsdóttir "Photodarkening-free fiber laser based on Yb-doped 20/400 gain fiber", Proc. SPIE 11981, Fiber Lasers XIX: Technology and Systems, 119810W (4 March 2022); https://doi.org/10.1117/12.2614616

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