title: High power passively Q-switched ytterbium fiber laser with Cr(4+):YAG as a saturable absorber.
abstract: We report an efficient high-peak-power and high-average-power passively Q-switched ytterbium fiber laser with a Cr(4+):YAG crystal as a saturable absorber in an external-resonator configuration. At an incident pump power of 17.5 W, the passively Q-switched fiber laser produces an average power greater than 6.2 W with a pulse repetition rate of 48 kHz. The output pulses noticeably display a mode-locking phenomenon that leads to the maximum peak power to be higher than 20 kW.
authors.forename: J Y
authors.initials: JY
authors.lastname: Huang
authors.forename: H C
authors.initials: HC
authors.lastname: Liang
authors.forename: K W
authors.initials: KW
authors.lastname: Su
authors.forename: Yung-Fu
authors.initials: YF
authors.lastname: Chen