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

[2] [2] V.Gaponstev,W.Kurpke.Fiber lasers grow in power [J].Laser Focus World,2002,38(8):83-85

[3] [3] J.Limpert,A.Liem,S.Hofer et al..150 W Nd/Yb codoped fiber laser at 1.1 μm [C].CLEO,2002,CThx1:590-591

[5] [5] Qihong Lou,Jun Zhou,Bing He et al..Fiber lasers and their coherent beam combination [J].Opt.& Photon.News,2008,19(5):46-51

[6] [6] Hongming Zhao,Qihong Lou,Jun Zhou et al..Characteristic of pulsed fiber laser induced by switching time [J].Chin.Opt.Lett.,2009,7(2):124-126

[7] [7] Jun Zhou,Qihong Lou,Lingfeng Kong et al..A 115 W ytterbium-doped fiber laser [J].Chin.Phys.Lett.,2004,21(6):1083-1085

[8] [8] Zhou Jun,Lou Qihong,Zhu Jianqiang et al..A antinuous-wave 714 W fiber laser with China-made longe-mode-area double-olad fiber [J].Acta Optica Sinica,2006,26(7):1119-1120

[9] [9] Liu Xia,Du Songtao,Xue Yuhao.High repetithon rate nanosecond pulse fiber amplifier based on China-made large-mode-area fiber [J].Chinese J.Lasers,2009,36(7):1876-1879

[12] [12] D.B.S.Soh,J.Nilsson,J.K.Sahu et al..Geometrical factor modification of helical-core fiber radiation loss formula [J].Opt.Commun.,2003,222:235-242

[13] [13] Z.Jiang,J.R.Marciante.Mode-area scaling of helical-core dual-clad fiber lasers and amplifiers [C].CLEO,2005,3:1849-1851

[14] [14] P.Wang,L.J.Cooper,R.B.Williams et al..Helical-core Yb-doped fibre laser [J].Elecron.Lett.,2005,40(21):1325-1326

[15] [15] V.Rastogi,K.S.Chiang.Propagation characteristics of a segmented cladding fiber [J].Opt.Lett.,2001,26(8):491-493

[16] [16] H.L.Offerhaus,N.G.Broderick,D.J.Richardson et al..High-energy single-transverse-mode Q-switched fiber laser based on a multimode large-mode-area erbium-doped [J].Opt.Lett.,1998,23(21):1683-1685

[17] [17] J.M.Sousa,O.G.Okhotnikov.Multimode Er-doped fiber for single-transverse-mode amplification [J].Appl.Phys.Lett.,1999,74(11):1528-1530

[18] [18] A.E.Siegman.Propagating modes in gain-guided optical fibers [J].J.Opt.Soc.Am.A,2003,20(8):1617-1628

[19] [19] A.E.Siegman,Y.Chen,V.sudesh et al..Confined propagation and near single-mode laser oscillation in a gain-guided,index antiguided optical fiber [J].Appl.Phys.Lett.,2006,89(25):251101

[20] [20] Xue Yuhao,He Bing,Wang Wei et al..Hundred-micron core diameter fiber laser and its mode control [J].Chinese J.Lasers,2009,36(7):1900-1704

[21] [21] U.Griebner,R.Koch,H.Schnnagel et al..Efficient laser operation with nearly diffraction-limited output from a diode-pumped heavily Nd-doped multimode fiber [J].Opt.Lett.,1996,21(4):266-268

[22] [22] I.Zawischa,K.Plamann,C.Fallnich et al..All-solid-state neodymium-based single-frequency master-oscillator fiber power-amplifier system emitting 5.5 W of radiation at 1064 nm [J].Opt.Lett.,1999,24(7):469-471

[23] [23] J.P.Koplow,D.A.V.Kliner,L.Goldberg.Single-mode operation of a coiled multimode fiber amplifier [J].Opt.Lett.,2000,25(7):442-444

[24] [24] D.Marcuse.Curvature loss formula for optical fibers [J].J.Opt.Soc.Am.,1976,66(3):216-220

[25] [25] Z.Haas,M.A.Santoro.A mode-filtering scheme for improvement of the band product in multimode fiber systems [J].J.Lightwave Technol.,1993,11(7):1125-1131

[26] [26] Li Libo,Lou Qihong,Zhou Jun et al..Mode selection of a tapored large-mode-area fiber laser [J].Chinese J.Lasers,2007,34(12):1625-1628