Liu Hua-Gang, Huang Jian-Hong, Weng Wen, Li Jin-Hui, Zheng Hui, Dai Shu-Tao, Zhao Xian, Wang Ji-Yang, Lin Wen-Xiong. High power all-normal-dispersion mode-locked Yb3+-doped double-clad fiber femtosecond laserJ. Acta Physica Sinica, 2012, 61(15): 154210. DOI: 10.7498/aps.61.154210