Abstract

We present a linearly polarized narrow-linewidth nanosecond fiber amplifier with a repetition rate of 400 kHz, pulse width of 2.8 ns, and a peak-power of up to 75 kW. The pulsed source is realized by modulating a continuous-wave 1064 nm single frequency laser fiber from an arbitrary waveform generator using an elctro-optic intensity modulator. The amplifier is achieved by Master Oscillator Power-Amplifier(MOPA) which is constituted by two Pre amplifier stage and a final amplifier stage. Good beam quality is found with measured beam propagation factor of M2 = 1.29.

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