[1] [1] V. Dominic, S. MacCormack, R. Waarts et al..110 W fibre laser [J]. Electron.Lett., 1999, 35(14):1158～1160

[2] [2] Y. Jeong, J. K. Sahu, D. N. Payne et al.. Ytterbium-doped large-core fiber laser with 1.36 kW continuous-wave output power [J]. Opt. Express, 2004, 12(25):6088～6092

[6] [6] D. J. Ripin, L. Goldberg. High efficiency side-coupling of light into optical fibres using imbedded V-grooves [J]. Eletron. Lett., 1995, 31(25):2204～2205

[7] [7] L. Goldberg, B. Cole, E. Snitzee. V-groove side-pumped 1.5 μm fibre amplifier [J]. Eletron. Lett., 1997, 33(25):2127～2129

[8] [8] Jeffrey P. Koplow, Sean W. Moore, Dahv A. V. Kliner. A new method for side pumping of double-clad fiber sources [J]. J. Quantum Electron., 2003, 39(4):529～540

[9] [9] Jianqiu Xu, Junhua Lu, G. Kumar et al.. A non-fused fiber coupler for side-pumping of double-clad fiber lasers [J]. Opt. Commun., 2003, 220(6):389～395

[10] [10] R. Herda, A. Liem, B. Schnabel et al.. Efficient side-pumping of fibre lasers using binary gold diffraction gratings [J]. Electron. Lett., 2003, 39(3):276～277

[11] [11] J. Turunen, F. Wyrowski. Micro-Optics: Elements, Systems and Applications [M]. London HERZIC. H.P. 1997 Chap.2, 31～52