In this work, a single-frequency fiber amplifier with output power of 703 W was demonstrated at 1064 nm in an all-fiber configuration. Cascaded Yb3+-doped fiber structure with different dopant concentration and hybrid 915/976 nm pump scheme were employed in power scaling stage to improve the gain saturation for higher transverse mode instability threshold. An overall optical efficiency of 67.5% was achieved at the maximum output power and the M2 was measured to be ~1.4. A spectral linewidth of 2 kHz was achieved at the 703-W laser power, which is to the best of our knowledge, the first time that the linewidth of a kHz single-frequency fiber amplifier is characterized at such high laser power.
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 Yb3+ 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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