[1] [1] He Fei, Cheng Ya. Femtosecond laser micromachining: Frontier in laser precision micromachining[J]. Chinese J Lasers, 2007, 34(5): 595-622.

[2] [2] Jia Wei, Wang Qingyue, Fu Xing, et al. Progress of femtosecond laser micromachining[J]. Chinese Journal of Quantum Electronics, 2004, 21(2): 194-201.

[3] [3] Arno K, Enrico S, Stefan D, et al. Coherently-combined two channel femtosecond fiber CPA system producing 3 mJ pulse energy[J]. Optics Express, 2011, 19(24): 24280-24285.

[4] [4] Arno K, Steffen H D, Tino E, et al. 22 GW peak-power fiber chirped-pulse-amplification system[J]. Optics Letters, 2014, 39(24): 6875-6878.

[5] [5] Daniault L, Hanna M, Lombard L, et al. Coherent beam combining of two femtosecond fiber chirped-pulse amplifiers[J]. Optics Letters, 2011, 36(36): 621-623.

[6] [6] Enrico S, Arno K, Jens L, et al. Coherent addition of fiber-amplified ultrashort laser pulses[J]. Optics Express, 2010, 18(26): 27827-27835.

[7] [7] Enrico S, Arno K, Sven B, et al. Coherently combined fiber laser system delivering 120 μJ femtosecond pulses[J]. Optics Letters, 2011, 36(4): 439-441.

[8] [8] Arno K, Enrico S, Jens L, et al. Basic considerations on coherent combining of ultrashort laser pulses[J]. Optics Express, 2011, 19(25): 25379-25387.

[9] [9] Yu H L, Ma P F, Wang X L, et al. Influence of temporal-spectral effects on ultrafast fiber coherent polarization beam combining system[J]. Laser Physics Letters, 2015, 12(10): 105301.

[10] [10] Arno K, Sven B, Marco K, et al. 530 W, 1.3 mJ, four-channel coherently combined femtosecond fiber chirped-pulse amplification system[J]. Optics Letters, 2013, 38(13): 2283-2285.

[11] [11] Siiman L A, Chang W Z, Zhou T, et al. Coherent femtosecond pulse combining of multiple parallel chirped pulse fiber amplifiers[J]. Optics Express, 2012, 20(16): 18097-18116.

[12] [12] Jiang Wenhan, Huang Shufu, Wu Xubin. Hill-climbing adaptive optics wavefront correction system[J]. Chinese J Lasers, 1988, 15(1): 17-21.

[13] [13] Zhou Lei, Ren Ge, Tan Yi, et al. Experiment of closed-loop pointing errors compensated by hill-climbing method in laser pointing system using return photons[J]. Acta Optica Sinica, 2012, 32(12): 1201003.

[14] [14] Ma Y X, Zhou P, Wang X L, et al. Coherent beam combination with single frequency dithering technique[J]. Optics Letters, 2010, 35(9): 1308-1310.

[15] [15] Ma Yanxing. Study on coherent beam combination of fiber laser based on dithering phase locking technology[D]. Changsha: National University of Defense Technology, 2012: 67-74.