[1] [1] Yin Shuping, Yan Ping, Gong Mali. End-pumped 300 W continuous-wave ytterbium-doped all-fiber laser with master oscillator multistage power amplifibers configuration［J］. Opt. Express, 2008, 16(22): 17864～17869

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

[3] [3] Xiao Rui, Hou Jing, Jiang Zongfu. Experimental investigation of phase detection and compensation in coherent combining of fiber laser array［J］. Acta Physica Sinica, 2006, 55(1): 184～187

[4] [4] Zhu Mengzhen, Huang Changchun, Cheng Yong et al.. Mutual injection phase-locked study of fiber laser with two output ports［J］. Chinese J. Lasers, 2010, 37(12): 2964～2968

[5] [5] V. Gapontsev, D. Gapontsev, N. Platonov et al.. 2 kW CW ytterbium fiber laser with record diffraction-limited brightness［C］. Munich: Proceedings of the Conference on Lasers and Electro-Optics, IEEE, 2005, 508

[6] [6] IPG Photonics. IPG Potonics successfully tests world′s first 10 kilowatt single-mode production laser［EB］. http://www.ipgphotonics.com/newsproduct.htm

[7] [7] D. J. Digiovanni, A. J. Stentz. Tapered fiber bundles for coupling light and out of cladding-pumped fiber devices［P］. U.S. Patent, 5864644, 1999

[8] [8] F. Gonthier, L. Martineau, F. Seguin et al.. Optical coupler comprising multimode fibers and method of making the same［P］. U.S. Patent, 7046875, 2006

[9] [9] Wang Dazheng, Wang Yonggang, Liu Suping et al.. New reflecting side-pumped method of double-clad fiber laser by micro-prism［J］. Acta Optica Sinica, 2009, 29(4): 974～979

[10] [10] Chen Zilun, Hou Jing, Jiang Zongfu. Estimation of maximum output power of double clad fiber laser［J］. High Power Laser and Particle Beams, 2007, 19(4): 577～580

[11] [11] Wang Yong. Heat dissipation in kilowatt fiber power amplifiers［J］. IEEE J. Quantum Electron., 2004, 40(6): 731～740

[12] [12] Li Pingxue, Zhu Chen, Zou Shuxhen et al.. Theoretical and experimental investigation of thermal effects in a high power Yb3+-doped double-clad fiber laser［J］. Opt. Laser Technol., 2008, 40(2): 360～364

[13] [13] A. B. Grudinin, D. N. Payne, P. W. Turner et al.. Multi-fiber arrangements for high power fiber lasers and amplifiers［P］. U.S. Patent, 6826335B1, 2004

[14] [14] Liu Lisong, Peng Jian, Yao Lei et al.. Research on the fabrication and coupling characteristic of symmetrical twin-core fiber［J］. Chinese J. Lasers, 2010, 37(3): 752～756

[15] [15] Zheng Jingjing, Zheng Kai, Peng Jian et al.. Analysis of splicing and splicing fusion coupling efficiency between single-core fiber and dual-core fiber［J］. Acta Optica Sinica, 2010, 30(9): 2529～2535

[16] [16] A. Ghatak, K. Thyagaraian. An Introduction to Fiber Optics［M］. Cambridge: Cambridge University Press, 1998, 545

[17] [17] A. E. Siegman. Propagation modes in gain-guided optical fibers［J］. J. Opt. Soc. Am. A, 2003, 20(8): 1617～1618

[18] [18] Wang Xiangru, Xiong Caidong, Luo Juanyan. Coupling coefficients evaluation of a directional coupler using gain guided and index antiguided fibers［J］. Opt. Commun., 2009, 282(3): 382～386

[19] [19] I. Kelson, A. A. Hardy. Strongly pumped fiber lasers［J］. IEEE J. Quantum Electron., 1998, 34(9): 1570～1577

[20] [20] D. C. Brown, H. J. Hoffman. Thermal, stress, and thermo-optic effects in high average power double-clad silica fiber lasers［J］. IEEE J. Quantum Electron., 2001, 37(2): 207～217

[21] [21] I. Kelson, A. Hardy. Optimization of strongly pumped fiber lasers［J］. J. Lightwave Technol., 1999, 17(5): 891～897

[22] [22] M. E. Innocenzi, H. T. Yura, C. L. Fincher. Thermal modeling of continuous-wave end-pumped solid-state lasers［J］. Appl. Phys. Lett., 1990, 56(19): 1831～1833