Abstract
We report a single-frequency pulsed Yb-doped fiber master-oscillator-power-amplifier at 1064nm producing output with pulse energy of 0.601 mJ for a pulse width of 95 ns at a pulse repetition frequency of 5 kHz. The Hybrid active fiber structure consisted with a piece of heavily Yb-doped 50/400 μm phosphosilicate fiber and a piece of 35/250 μm silica fiber with moderate Yb<sup>3+</sup> doping concentration was employed to mitigate SBS effect. Besides, by pre-shaping the seed pulses, SPM-induced spectral linewidth broadening can be suppressed during power scaling.
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