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7 March 2019 A compact, single-frequency, high-power, SBS-free, Yb-doped single-stage fiber amplifier
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Interest in compact, single-frequency fiber amplifiers has increased within many scientific and industrial applications. The main challenge is the onset of nonlinear effects, which limit their power scaling. Here we demonstrate a compact, highpower, single-frequency, polarization-maintaining, continuous-wave fiber amplifier using only one amplification stage. We developed the fiber amplifier using a master oscillator fiber amplifier architecture, where a low-noise, singlefrequency, solid-state laser operating at 1064 nm was used as a seed source. We evaluated the amplifier's performance by using several state-of-the-art, small-core, Ytterbium (Yb)-doped fibers, as well as an in-house-made, highly Yb-doped fiber. An output power of 82 W was achieved with no sign of stimulated Brillouin scattering. A good beam quality and a polarization extinction ratio (PER) of < 25 dB were achieved. The compact fiber amplifier can be a competitive alternative to multi stage designed fiber amplifiers.
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Enkeleda Balliu, Magnus Engholm, and Hans-Erik Nilsson "A compact, single-frequency, high-power, SBS-free, Yb-doped single-stage fiber amplifier", Proc. SPIE 10896, Solid State Lasers XXVIII: Technology and Devices, 1089618 (7 March 2019);

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