[1] Wang Y, Kitahara R, Kiyoyama W et al. 8-kW single-stage all-fiber Yb-doped fiber laser with a BPP of 0.50 mm-mrad[J]. Proceedings of SPIE, 11260, 1126022(2020).

[2] Ikoma S, Uchiyama K, Takubo Y et al. 5-kW single stage all-fiber Yb-doped single-mode fiber laser for materials processing[J]. Proceedings of SPIE, 10512, 105120C(2017).

[3] Sotsuka Y, Nishimoto S, Tsumano T et al. The dawn of computer-assisted robotic osteotomy with ytterbium-doped fiber laser[J]. Lasers in Medical Science, 29, 1125-1129(2014).

[4] Lim K J, Kai-Wen S S, Yong’En Y J et al. High absorption large-mode area step-index fiber for tandem-pumped high-brightness high-power lasers[J]. Photonics Research, 8, 1599(2020).

[5] Xiao Q R, Tian J D, Li D et al. Tandem-pumped high-power ytterbium-doped fiber lasers: progress and opportunities[J]. Chinese Journal of Lasers, 48, 1501004(2021).

[6] Hecht J. Beam combining cranks up the power[J]. Laser Focus World, 48, 50-53(2012).

[7] Kalyoncu S K, Yeniay A. High brightness 1018 nm monolithic fiber laser with power scaling to >500 W[J]. Applied Optics, 59, 4763-4767(2020).

[8] Yan P, Wang X J, Li D et al. High-power 1018 nm ytterbium-doped fiber laser with output of 805 W[J]. Optics Letters, 42, 1193-1196(2017).

[9] Yan P, Wang X J, Wang Z H et al. A 1150-W 1018-nm fiber laser bidirectional pumped by wavelength-stabilized laser diodes[J]. IEEE Journal of Selected Topics in Quantum Electronics, 24, 17627593(2018).

[10] Xiao H, Zhou P, Wang X L et al. Experimental investigation on 1018-nm high-power ytterbium-doped fiber amplifier[J]. IEEE Photonics Technology Letters, 24, 1088-1090(2012).

[11] Xie Z X, Fang Q, Xu Y et al. Hundred-Watts-level monolithic narrow linewidth linearly-polarized fiber laser at 1018 nm[J]. Optical Engineering, 58, 106106(2019).

[12] Palma-Vega G, Walbaum T, Heinzig M et al. Ring-up-doped fiber for the generation of more than 600 W single-mode narrow-band output at 1018 nm[J]. Optics Letters, 44, 2502-2505(2019).

[13] Glick Y, Sintov Y, Zuitlin R et al. Single-mode 230 W output power 1018 nm fiber laser and ASE competition suppression[J]. Journal of the Optical Society of America B, 33, 1392-1398(2016).

[14] Platonov N, Shkurikhin O, Fomin V et al. High-efficient kW-level single-mode ytterbium fiber lasers in all-fiber format with diffraction-limited beam at wavelengths in 1000－1030 nm spectral range[J]. Proceedings of SPIE, 11260, 1126003(2020).

[15] Wang Y, Po H. Dynamic characteristics of double-clad fiber amplifiers for high-power pulse amplification[J]. Journal of Lightwave Technology, 21, 2262-2270(2003).

[16] Kurkov A S. Oscillation spectral range of Yb-doped fiber lasers[J]. Laser Physics Letters, 4, 93-102(2007).

[17] Zhang X J, Duan Y F, Zhao S et al. Experimental study on high efficient all-fiber lasers at 1018 nm[J]. Acta Optica Sinica, 36, 0414002(2016).