[1] Li S S, Wang Y L, Lu Z W et al. High-quality near-field beam achieved in a high-power laser based on SLM adaptive beam-shaping system[J]. Optics Express, 23, 681-689(2015).

[2] Fried N M, Hung V C, Walsh J T. Laser tissue welding: laser spot size and beam profile studies[J]. IEEE Journal of Selected Topics in Quantum Electronics, 5, 1004-1012(1999).

[3] Fuse K. Beam shaping for advanced laser materials processing[J]. Laser Technik Journal, 12, 19-22(2015).

[4] Han W, Cheng W, Zhan Q W. Flattop focusing with full Poincaré beams under low numerical aperture illumination[J]. Optics Letters, 36, 1605-1607(2011).

[5] Dickey F M, Weichman L S, Shagam R N. Laser beam shaping techniques[J]. Proceedings of SPIE, 4065, 338-348(2000).

[6] Homburg O, Bayer A, Mitra T et al. Beam shaping of high power diode lasers benefits from asymmetrical refractive micro-lens arrays[J]. Proceedings of SPIE, 6876, 68760B(2008).

[7] Lin Y, Hu J S. Laser beam shaping techniques[J]. Laser Journal, 29, 338-348(2008).

[8] Wu C J, Liu R X, Xu Y. Design and simulation of flat-top microstructure fiber[J]. Proceedings of SPIE, 9449, 94491U(2015).

[9] Mayeh M, Farahi F. Laser beam shaping and mode conversion in optical fibers[J]. Photonic Sensors, 1, 187-198(2011).

[10] Noordegraaf D, Maack M D, Skovgaard P M W et al. All-fiber 7×1 signal combiner for incoherent laser beam combining[J]. Proceedings of SPIE, 7914, 79142L(2011).

[11] Shiner B. Delivering power[J]. Nature Photonics, 4, 290(2010).

[12] Kliner D A V, Chong K, Franke J et al. 4-kW fiber laser for metal cutting and welding[J]. Proceedings of SPIE, 7914, 791418(2011).

[13] Shen Y P, Chen C, Gao M et al. Technological characteristics in fiber laser cutting of medium-thickness aluminum alloy sheet[J]. Chinese Journal of Lasers, 46, 0102008(2019).

[14] Lu W, Ma X Y, Duan A Q et al. Weld formation and stability analysis of fiber laser beam welded BTi6431S titanium alloy[J]. Laser & Optoelectronics Progress, 57, 131405(2020).

[15] Zhou H, Chen Z L, Zhou X F et al. All-fiber 7 × 1 signal combiner for high power fiber lasers[J]. Applied Optics, 54, 3090-3094(2015).

[16] Xu C L, Yan K, Gu C et al. All-fiber laser with flattop beam output using a few-mode fiber Bragg grating[J]. Optics Letters, 43, 1247-1250(2018).