Fu Kuan, Xu Zhong-Wei, Li Hai-Qing, Peng Jing-Gang, Dai Neng-Li, Li Jin-Yan. Dark pulses and harmonic mode locking in graphene-based passively mode-locked Yb3+-doped fiber laser with all-normal dispersion cavityJ. Acta Physica Sinica, 2015, 64(19): 194205. DOI: 10.7498/aps.64.194205