1.1 MW peak-power, 7 W average-power, high-spectral-brightness, diffraction-limited pulses from a photonic crystal fiber amplifier

摘要

We report a large-core, Yb-doped photonic crystal fiber amplifier generating diffraction-limited (M~(2) velence 1.04), approx0.45 ns, approx8 GHz linewidth pulses with energies of 540 (mu)J, peak power in excess of 1.1 MW, and average power of approx7.2 W at a repetition rate of 13.4 kHz. The pulse peak spectral brightness exceeds 10 kW/(sr Hz cm~(2)) and is the highest generated by a fiber source, to our knowledge.