9 March 2016 All-glass fiber amplifier pumped by ultrahigh brightness pump
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We investigate high brightness pumping of multi-kW fiber amplifier in a bi-directional pumping configuration. Each pump outputs 2 kW in a 200 μm, 0.2 NA multi-mode fiber. Specialty gain fibers, with 17 μm MFD and 5-dB/meter pump absorption, have been developed. The maximum fiber amplifier output power is 2550 W, limited by multi-mode instability, with 90% O-O efficiency and M2 < 1.15. The fiber amplifier linewidth is <12 GHz. We also present kW fiber amplifier results using gain fiber with metalized fiber coating.
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Charles X. Yu, Charles X. Yu, Oleg Shatrovoy, Oleg Shatrovoy, T. Y. Fan, T. Y. Fan, } "All-glass fiber amplifier pumped by ultrahigh brightness pump", Proc. SPIE 9728, Fiber Lasers XIII: Technology, Systems, and Applications, 972806 (9 March 2016); doi: 10.1117/12.2211134; https://doi.org/10.1117/12.2211134


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