Using self-designed large core Yb-doped fiber (100 μm / 400 μm)1 and high-power fiber combiner, a laser output with average power of 3 kW, repetition rate of 60 kHz, pulse width of 150 ns, single pulse energy of 50 mJ is achieved by combining three laser modules in an all fiber-fusion structure, where each output power is more than 1000 W; and the beam combining efficiency is 98.3%. By controlling the pulse delay of the three modules, the three pulses are managed to be overlapped completely, and the overlapping rate is more than 97%. This is the highest value among all known fiber pulsed laser output using self-developed fiber and pulse beam combiner.
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