[1] [1] Yan Ping, Xiao Qirong, Fu Cheng, et al.. 1.6kW ytterbium doped all-fiber laser ［J］. Chinese J Lasers, 2012, 39(4): 0416001.

[2] [2] Lou Qihong, He Bing, Xue Yuhao, et al.. 1.75-kilowatt continuous-wave output fiber laser using homemade ytterbium-doped large-code fiber ［J］. Chinese J Lasers, 2009, 36(5): 1277.

[3] [3] Liu Zejin, Leng Jinyong, Guo Shaofeng, et al.. All fiber 2kW near-single-mode fiber laser ［J］ . Chinese J Lasers, 2013, 40(9): 0908003.

[4] [4] Zhao Hong, Zhou Shouhuan, Zhu Chen, et al.. High power fiber laser with output power more than 1.2kW ［J］. Lasers & Infrared, 2006, 36(10): 1359.

[5] [5] D J Richardson, J Nilsson, W A Clarkson. High power fiber lasers: current status and future perspectives ［J］. J Opt Soc Am B, 2010. 27(11): B63-B92.

[6] [6] Duan Kailiang, Zhao Baoyin, Zhao Wei, et al.. All fiber 1000W fiber laser ［J］. Chinese J Lasers, 2009, 36(12): 3219.

[7] [7] Li Wei, Wu Zichun, Chen Xi, et al.. High power fiber laser with output power breaking through 1kW ［J］. High Power Laser and Particle Beams, 2006, 18(6): 890.

[8] [8] Liu Zejin, Zhou Pu, Wang Xiaolin, et al.. The history, development and trend of coherent combining of laser beams［J］. Chinese J Lasers, 2010, 37(9): 2221-2234.

[9] [9] Chen Shuang, Feng Ying. Temperature distribution in high power photonic crystal fiber laser ［J］. Acta Photonica Sinica, 2008, 37(06): 1134-1138.

[10] [10] Cheng Can, Xin Guofeng, Pi Haoyang, et al.. Measurement of thermal relaxation time of high power semiconductor lasers ［J］. Chinese J Lasers, 2007, 33(12): 1671-1674.

[11] [11] Hecht J. Understanding fiber optics (fourth edition)［M］. Columbus: Prentice Hall, 2002.

[12] [12] Yong Zhao, Yanbiao Liao. Discrimination methods and demodulation techniques for fiber Bragg grating sensors［J］. Optics and Lasers in Engineering. 2004, 41(1): 1-18.

[13] [13] Jiang Qiujie, Yan Ping, Zhang Jinge, et al.. Analysis on thermal characteristic of ytterbium. doped fiber lasers ［J］. Chinese J Lasers, 2008, 35(6): 827-829.

[14] [14] Maxim Bolshtyansky, Paul Wysocki, Nicholas Conti. Model of temperature dependence for gain shape of erbium-doped fiber amplifie［J］. Journal of Lightwave Technology. 2000, 18(11): 1533-1540.

[15] [15] D A Grukh, A S Kurkov, V M Paramonov, et al.. Effect of heating on the optical properties of Yb3+-doped fibres and fibre lasers［J］. Quantum Electronics. 2004, 34(6): 579-582.

[16] [16] M Bell, N Kaurova, A Divochiy. On the nature of resistive transition in disordered superconducting nanowire［J］. IEEE Transactions on Applied Super Conductivity. 2007, 17(2): 267-271.

[17] [17] M Gong, Y Yuan, C Li, et al.. Numerical modeling of transverse mode competition in strongly pumped multimode fiber lasers and amplifiers［J］. Optics Express, 2007, 15(6): 3236-3246.

[18] [18] I Kelson, A Hardy. Optimization of strongly pumped fiber lasers［J］. Journal of Lightwave Technology, 1999, 17(5): 891-897.

[19] [19] Yong W, Hong P. Dynamic characteristics of double-clad fiber amplifiers for high-power pulse amplification［J］. Journal of Lightwave Technology, 2003, 21(10): 2262-2270.

[20] [20] Kelson I, Hardy A. Strongly pumped fiber lasers［J］. IEEE Journal of Quantum Electronics, 1998, 34(9): 1570-1577.

[21] [21] R T Schermer, J H Cole. Improved bend loss formula verified for optical fiber by simulation and experiment［J］. IEEE Journal of Quantum Electronics, 2007, 43(10): 899-909.

[22] [22] O G Okhotnikov. Fiber lasers［M］. Germany: Wiley-VCH, 2012.