[1] Richardson D J, Nilsson J, Clarkson W A. High power fiber lasers: current status and future perspectives[J]. Journal of the Optical Society of America B, 27, B63-B92(2010).

[2] Yang Y Q, Wu S B, Zhang Y et al. Application progress and prospect of fiber laser in metal additive manufacturing[J]. Chinese Journal of Lasers, 47, 0500012(2020).

[3] Yang Q B, Shen H, Zhang L et al. Research progress on ytterbium-doped silica glass fiber for high-power narrow-linewidth fiber lasers[J]. Laser & Optoelectronics Progress, 59, 1516011(2022).

[4] Wang X L, Gong Z Q, Zhou P et al. Domestic all-fiber laser realizes 525 W high power output[J]. Chinese Journal of Lasers, 39, 0408007(2012).

[5] Wang P, Yang B L, Zhang H W et al. 5-kW monolithic fibre laser oscillator with ring beam output employing bidirectional-pumping scheme[J]. Acta Optica Sinica, 42, 0514004(2022).

[6] Lin X F, Zhang Z L, Xing Y B et al. Near-single-mode 2-kW fiber amplifier based on M-type ytterbium-doped fiber[J]. Acta Physica Sinica, 71, 034205(2022).

[7] Wang G J, Song J X, Chen Y S et al. Six kilowatt record all-fiberized and narrow-linewidth fiber amplifier with near-diffraction-limited beam quality[J]. High Power Laser Science and Engineering, 10, e22(2022).

[8] Wang X J, Xiao Q R, Yan P et al. 3000 W direct-pumping all-fiber laser based on domestically produced fiber[J]. Acta Physica Sinica, 64, 164204(2015).

[9] Feng G F, Yang J Y, Wang J M et al. 20/400 double-clad Yb-doped fibers for high power fiber lasers[J]. Laser & Infrared, 49, 438-441(2019).

[10] Lin A X, Ni L, Peng K et al. Domestic 20/400 μm active fiber realizes 3 kW laser output[J]. Chinese Journal of Lasers, 44, 0115001(2017).