Thanks to the advantages of compact,high beam quality and high conversion efficiency,narrow linewidth high pulse energy single mode nanosecond-pulsed fiber amplifier is highly desired in laser detection and industry applications.Recently,an all-fiber amplifier with a home-made Yb-doped tapered fiber produces linearly polarized(12.3 dB PER)100 ns,1 mJ pulses with 0.49 nm linewidth,M2=1.49,100 W of average output power and 10 kW peak power at 1 064 nm.It is believed that the pulse energy,output power and beam quality can be further improved by optimizing the Yb-doped fiber and design of amplifier.
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