5.2 kW single-mode output power from a Yb 20/400 fiber with reduced thermo-optic coefficient

A. Rosales-García; R. Jensen; P. Kristensen; J. W. Nicholson; S. Ovtar; M. Mitrovic; K. Ingerslev; B. Edvold; S. Christensen; J. Pincha; D. DiGiovanni; B. Pálsdóttir

doi:10.1117/12.3003763

12 March 2024 5.2 kW single-mode output power from a Yb 20/400 fiber with reduced thermo-optic coefficient

A. Rosales-García, R. Jensen, P. Kristensen, J. W. Nicholson, S. Ovtar, M. Mitrovic, K. Ingerslev, B. Edvold, S. Christensen, J. Pincha, D. DiGiovanni, B. Pálsdóttir

Author Affiliations +

Proceedings Volume 12865, Fiber Lasers XXI: Technology and Systems; 128650D (2024) https://doi.org/10.1117/12.3003763
Event: SPIE LASE, 2024, San Francisco, California, United States

Abstract

We report the performance of an LMA Yb-doped fiber, designed for increasing the transverse mode instability threshold and minimizing nonlinear effects in multi-kilowatt class fiber lasers, by reducing the thermo-optic coefficient of the fiber core, compared with that of standard aluminophosphosilicate Yb-doped fibers. A TMI-free 5.2 kW single-mode output power from a Yb 20/400 fiber with a 17.5 μm mode-field diameter was achieved in a broad bandwidth, co-pumped amplifier with 78% optical-to-optical efficiency, while a 4 kW signal output was attained in a 26 GHz linewidth amplifier. Negligible photodarkening loss was observed during 150 hour laser operation at 2 kW.

Conference Presentation

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

Citation Download Citation

A. Rosales-García, R. Jensen, P. Kristensen, J. W. Nicholson, S. Ovtar, M. Mitrovic, K. Ingerslev, B. Edvold, S. Christensen, J. Pincha, D. DiGiovanni, and B. Pálsdóttir "5.2 kW single-mode output power from a Yb 20/400 fiber with reduced thermo-optic coefficient", Proc. SPIE 12865, Fiber Lasers XXI: Technology and Systems, 128650D (12 March 2024); https://doi.org/10.1117/12.3003763

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