5 kW single-mode output power from Yb-doped fibers with increased higher-order mode loss

Jeffrey W. Nicholson; Jose Pincha; Ishu Kansal; Robert S. Windeler; Eric Monberg; Vasiliy Lukonin; Anand Hariharan; Gregory Williams; Andrea Rosales-Garcia; Lalitkumar Bansal; David J. DiGiovanni

doi:10.1117/12.2649969

8 March 2023 5 kW single-mode output power from Yb-doped fibers with increased higher-order mode loss

Jeffrey W. Nicholson, Jose Pincha, Ishu Kansal, Robert S. Windeler, Eric Monberg, Vasiliy Lukonin, Anand Hariharan, Gregory Williams, Andrea Rosales-Garcia, Lalitkumar Bansal, David J. DiGiovanni

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Proceedings Volume 12400, Fiber Lasers XX: Technology and Systems; 1240002 (2023) https://doi.org/10.1117/12.2649969
Event: SPIE LASE, 2023, San Francisco, California, United States

Abstract

We report results from a new Yb-doped gain fiber with increased higher-order-mode (HOM) loss, compared to conventional step-index fibers. The fiber had 20 µm mode-field diameter (MFD), high absorption, and high transverse-mode instability (TMI) threshold. TMI-free operation with 5 kW output power was demonstrated from a 9 m length of gain fiber, limited by pump power. The large MFD and high absorption allowed for a 7.5 m long amplifier with greater than 80% o-o efficiency and the Raman peak more than 50 dB below the signal. These results were also enabled by a new, small-size, 7+1:1 pump-signal combiner.

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Jeffrey W. Nicholson, Jose Pincha, Ishu Kansal, Robert S. Windeler, Eric Monberg, Vasiliy Lukonin, Anand Hariharan, Gregory Williams, Andrea Rosales-Garcia, Lalitkumar Bansal, and David J. DiGiovanni "5 kW single-mode output power from Yb-doped fibers with increased higher-order mode loss", Proc. SPIE 12400, Fiber Lasers XX: Technology and Systems, 1240002 (8 March 2023); https://doi.org/10.1117/12.2649969

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