Beam combining of fiber lasers has attracted much interest as a practical means to power scale fiber laser/amplifiers
beyond the limitations of a single mode output from an individual fiber [1]. Almost all of the high power demonstrations
to date that deliver good beam quality after the combing process (coherent and spectral) require some linewidth control
for efficient combining, typically less than 10GHz [2,3,4]. Previously we demonstrated single mode, Yb-doped LMA
fiber amplifiers operated with around 7GHz linewidth at 1kW output power [5]. In this paper, the latest generations of
these amplifiers, based on the latest developments in LMA Yb-doped fiber technology demonstrate the capability to
operate with linewidths around 3GHz at the 1kW power level. We present the latest data on optical properties of these
new Yb-doped amplifiers and the SBS threshold as a function of input seed laser linewidth and discuss the technologies
being developed to operate at higher power levels and narrower linewidths.
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