[2] [2] Changgeng Ye, Ping Yan, Mali Gong et al.. Pulsed pumped Yb-doped fiber amplifier at low repetition rate [J]. Chin. Opt. Lett., 2005, 3(5):249～250

[3] [3] J. Limpert, A. Liem, H. Zellmer et al.. 500 W continuous-wave fibre laser with excellent beam quality [J]. Electron. Lett., 2003, 39(8):645～647

[4] [4] Jeffrey P. Koplow, Dahv A. V. Kliner, Lew Goldberg. Single-mode operation of a coiled multimode fiber amplifier [J]. Opt. Lett., 2000, 25(7):442～444

[5] [5] Yong Wang, Hong Po. Dynamic characteristics of double-clad fiber amplifiers for high-power pulse amplification [J]. J. Lightwave Technol., 2003, 21(10):2262～2271

[6] [6] Yong Wang. Optimization of pulse amplification in ytterbium-doped double-clad fiber amplifiers [J]. J. Lightwave Technol., 2005, 23(6):2139～2147

[9] [9] Rudiger Paschotta, Johan Nilsson, Anne C. Tropper et al.. Ytterbium-doped fiber amplifiers [J]. IEEE J. Quantum Electron., 1997, 33(7):1049～1056

[10] [10] A. Liem, J. Limpert, H. Zellmer et al.. 100-W single-frequency master-oscillator fiber power amplifier [J]. Opt. Lett., 2003, 28(17):1537～1539

[11] [11] David Machewirth, Victor Khitrov, Upendra Manyam et al.. Large mode area double clad fibers for pulsed and CW lasers and amplifiers [C]. SPIE, 2004, 5335:140～150