Millijoule-class Yb-doped pulsed fiber laser operating at 977 nm.

摘要: We report what we believe to be the first millijoule-class ytterbium-doped fiber laser system operating on zero-phonon line at 977 nm. An actively Q-switched master oscillator delivers nanosecond pulses (FWHM 12–32 ns) adjustable multiples of 10 kHz repetition rates that are further amplified in an ultralarge core photonic crystal amplifier. At highest available pumping level, a maximal average power 78 W was obtained for 32 ns rate 190 kHz, whereas millijoule energy level reached 12 ns lower 10 kHz.