▎ 摘 要
A fiber laser resonantly pumped Q-switched mode locked Er: YAG ceramic 1645 nm laser using graphene as the saturable absorber is realized. The mode-locked pulses with average output power of 320 mW, Q-switching envelope temporal width of 10 mu s and mode-locking repetition rate of 83 MHz can readily be generated from the laser. To the best of our knowledge, this is the first report on the graphene-based Q-switching mode locked Er: YAG ceramic laser emitting around 1645 nm.