▎ 摘　　要

Passively Q-switched erbium-doped fiber laser (EDFL) based on graphene oxide saturable absorber ( SA) is experimentally demonstrated at pump power threshold as low as 11.8 mW. The GO was prepared by chemical oxidation and embedded into PMMA to fabricate a high quality SA device. By inserting the SA into an EDFL ring cavity, stable Q-switched operation can be achieved with the shortest pulse width of 6.12 mu s, the maximum pulse energy up to 145 nJ and pulse repetition rates varying from 21.5 kHz to 68.7 kHz. The Q-switching pulse shows no spectral modulation with a peak-to-pedestal ratio of 62.6 dB, which indicates the high stability of the laser. The experimental results further verify that GO possesses the potential advantage for stable Q-switched pulse generation at 1.5 mu m