[1] [1] Platonov N S,Gapontsev D V,Gapontsev V P,et al. 135 W CW fiber laser with perfect single mode output [J].CLEO,2002,19-24.

[2] [2] Zenteno L. High-power double-clad fiber lasers [J].Journal of Lightwave Technology,1993,11(9):1435-1446.

[4] [4] Liu C H,Ehlers B,Doerfel F,et al. 810 W continuous-wave and single-transverse-mode fibre laser using 20 μm core Yb-doped double-clad fiber [J].Electron. Lett.,2004,40(23).

[5] [5] Wang Yong,Xu Changqing. Analysis of raman and thermal effects in kilowatt fiber lasers [J].Optics Communications,2004,242(9):487-502.

[8] [8] Agrawal G P. Nonlinear Fiber Optics & Applications of Nonlinear Fiber Optics [M].Beijing: Publishing House of Electronics Industry,2002.

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