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8 March 2023 Performance of 915 nm pumped LMA Yb fiber designs for long-term reliable multi-kilowatt operation
A. Rosales-García, R. Jensen, K. Ingerslev, B. Edvold, P. Kristensen, S. Ovtar, S. Adsersen, J. W. Nicholson, R. S. Windeler, D. DiGiovanni, B. Pálsdóttir
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Proceedings Volume 12400, Fiber Lasers XX: Technology and Systems; 1240003 (2023) https://doi.org/10.1117/12.2649286
Event: SPIE LASE, 2023, San Francisco, California, United States
Abstract
We report the performance of new LMA Yb fibers with increased cladding absorption for pumping in the 915 nm absorption band. A 0.5 dB/m cladding-absorption Yb20/400 fiber showed negligible photodarkening loss in 400-hour laser operation at 3 kW, with 77% optical-to-optical efficiency. Low-SRS and TMI-free operation at 3.5 kW signal power was achieved with a 0.65 dB/m cladding-absorption and 20.2 μm mode-field diameter Yb fiber, tested in a co-pumped amplifier. The Raman peak was 31 dB below the signal peak at the maximum power.
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A. Rosales-García, R. Jensen, K. Ingerslev, B. Edvold, P. Kristensen, S. Ovtar, S. Adsersen, J. W. Nicholson, R. S. Windeler, D. DiGiovanni, and B. Pálsdóttir "Performance of 915 nm pumped LMA Yb fiber designs for long-term reliable multi-kilowatt operation", Proc. SPIE 12400, Fiber Lasers XX: Technology and Systems, 1240003 (8 March 2023); https://doi.org/10.1117/12.2649286
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KEYWORDS
Ytterbium
Fiber lasers
Transverse mode instability
Fiber amplifiers
High power fiber amplifiers
High power fiber lasers
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