[1] Dominic V,et al.110W fibre laser.Electronics Letters,1999,35(14):1158～1160

[2] Paschotta R,et al.Ytterbium-doped fiber amplifiers.IEEE J Quantum Electron,1997,33(7):1049～1056

[3] Kelson I,Hardy A.Strongly pumped fiber lasers.IEEE J Quantum Electron,1998,34(9):1570～1577

[4] Kelson I,Hardy A.Optimization of strongly pumped fiber lasers.Journal of lightwave Technology,1999,17(5):891～897