2.7 kW CW Narrow Linewidth Yb-doped all-fiber Amplifiers for Beam Combining Application

We reported on a master-oscillator Yb-doped all-fiber amplifier with 2.7 kW CW output power, 50 GHz linewidth and near-diffraction limited beam quality (M2 < 1.2). No phenomenon about stimulated Brillouin scattering or mode instabilities were observed.