Abstract

We report what we believe to be the first millijoule-class ytterbium-doped fiber laser system operating on the zero-phonon line at 977nm. An actively Q-switched master fiber oscillator delivers nanosecond pulses (FWHM 1232ns) at adjustable multiples of 10kHz 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 78W was obtained for 32ns pulses at a repetition rate of 190kHz, whereas the millijoule energy level was reached for 12ns pulses at the lower repetition rate of 10kHz.

© 2010 Optical Society of America

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