We report what we believe to be the first millijoule-class ytterbium-doped fiber laser system operating on the zero-phonon line at . An actively Q-switched master fiber oscillator delivers nanosecond pulses (FWHM ) at adjustable multiples of repetition rates that are further amplified in an ultralarge core photonic crystal fiber amplifier. At the highest available pumping level, a maximal average power of was obtained for pulses at a repetition rate of , whereas the millijoule energy level was reached for pulses at the lower repetition rate of .
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