High-power and high-energy ultrafast optical vortex beams have recently gained considerable interest for practical applications in laser-based material processing. Here, we investigate the parabolic pulse amplification of linearly polarized optical vortex beams with controllable topological charges of l = ±1 utilizing a few-mode large mode area polarization-maintaining Yb-doped fiber (PM-YDF) amplifier system. It yields a maximum average output power of approximately ~14.8 W at a repetition rate of approximately ~3.7 MHz, corresponding to a single pulse energy of approximately ~4 μJ. The output optical vortex pulses can be externally de-chirped to approximately ~200 fs with a peak power of approximately ~11.2 MW.
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