[1] [1] Seo Y, Lee D, Pyo S. The interaction of high-power fiber laser irradiation with intrusive rocks［J］. Scientific Reports,2022,12:680.

[2] [2] Fu Bingyan, OuYang Basheng, Liu Weidong, et al. Study on fiber laser rotary drilling process of 0.12mm SUS304［J］. Optical Technique,2016,42(02):126—129.

[3] [3] E Honea, R S Afzal, M Savage-Leuchs, et al. Spectrally beam combined fiber lasers for high power, efficiency, and brightness［C］∥High-Power Lasers 2012: Technology and Systems. Edinburgh, United Kingdom: Proc. SPIE,2013:860115.

[4] [4] S Taccheo. Fiber lasers for medical diagnostics and treatments: state of the art,challenges and future perspectives［C］∥Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XVII. San Francisco, USA:Proc.SPIE,2017:1005808.

[5] [5] Yu Jing, Hu Shuling, Gao Chunqing, et al. Theoretical analysis and experimental study of double-clad Yb3+-doped Fiber laser［J］. Optical Technique,2006,32(S1):87—89.

[6] [6] Y Liu, F Zhang, N Zhao, et al. Single transverse mode laser in a center-sunken and cladding-trenched Yb-doped fiber［J］. Optics Express,2018,26(3):3421—3426.

[7] [7] E Garmire. Perspectives on stimulated Brillouin scattering［J］. New Journal of Physics,2017,19(1):011003.

[8] [8] Jauregui C, Limpert J, Tünnermann A. High-power fiber lasers［J］.Nature Photonics,2013,7:861—867.

[9] [9] Zhaode Li, Shangde Zhou, Aimin Liu, et al. Experimental study on the in-band amplified spontaneous emission in the single-mode continuous-wave Yb-Doped fiber amplifier operating near 980 nm［J］. Photonics,2022,9(6):377.

[10] [10] M Cavillon, C Kucera, T W Hawkins, et al. Ytterbium-doped multicomponent fluorosilicate optical fibers with intrinsically low optical nonlinearities［J］. Optical Materials Express,2018,8(4):744—760.

[11] [11] A Kobyakov, M Sauer, D Chowdhury. Stimulated Brillouin scattering in optical fibers［J］. Advances in Optics and Photonics,2010,2(1):1—59.

[12] [12] R G Smith. Optical power handling capacity of low loss optical fibers as determined by stimulated Raman and brillouin scattering［J］. Applied Optics,1972,11(11):2489—2494.

[13] [13] G. P. Agrawal, Nonlinear fiber optics［M］. New York: Academic Press,1995:370—403.

[14] [14] Deepak Jain, Yongmin Jung, Pranabesh Barua, et al. Demonstration of ultra-low NA rare-earth doped step index fiber for applications in high power fiber lasers［J］. Optics Express,2015,23(6):7407—7415.

[15] [15] Anping Liu. Suppressing stimulated Brillouin scattering in fiber amplifiers using nonuniform fiber and temperature gradient［J］. Optics Express,2007,15(3):977—984.

[16] [16] J. Hansryd, F. Dross, M. Westlund, et al. Increase of the SBS threshold in a short highly nonlinear fiber by applying a temperature distribution［J］. Journal of Lightwave Technology,2001,19(11):1691—1697.

[17] [17] VP D Dragic, C Kucera, J Ballato, et al. Brillouin scattering properties of lanthano-aluminosilicate optical fiber［J］. Applied Optics,2014,53(25):5660—5671.

[18] [18] M. E. Lines. Raman-gain estimates for high-gain optical fibers［J］. Journal of Applied Physics,1987,62(11):4363.

[19] [19] Maximilian Heck, Victor Bock, Ria G. Krmer, et al. Mitigation of stimulated Raman scattering in high power fiber lasers using transmission gratings［C］∥Fiber Lasers XV: Technology and Systems. San Francisco,USA:Proc.SPIE,2018:105121I.

[20] [20] J. Kim, P. Dupriez, C. Codemard, et al. Suppression of stimulated Raman scattering in a high power Yb-doped fiber amplifier using a W-type core with fundamental mode cut-off［J］. Optics Express,2006,14(12):5103—5113.

[21] [21] Ma X, Hu IN, Galvanauskas A. Propagation-length independent SRS threshold in chirally-coupled-core fibers［J］. Optics Express,2011,19(23):22575—22581.

[22] [22] Thomas Tanggaard Alkeskjold, Single-mode large-mode area fiber amplifier with higher-order mode suppression and distributed passband filtering of ASE and SRS［C］∥ Fiber Lasers Ⅶ: Technology, Systems, and Applications.San Francisco,USA:Proc.SPIE,2010:758012.

[23] [23] John Ballato, Peter Dragic. Rethinking optical fiber: new demands, old glasses［J］. Journal of the American Ceramic Society,2013,96(9):2675—2692.

[24] [24] P D Dragic, J Ballato. Characterisation of Raman gain spectra in Yb∶YAG-derived optical fibres［J］. Electron. Lett.,2013,49(14):895—897.

[25] [25] Sheng Quan, Wang Meng, Shi Chao-Du, et al. High-power narrow-linewidth single-frequency pulsed fiber amplifier based on self-phase modulation suppression via sawtooth-shaped pulses［J］. Acta Phys. Sin.,2021,70(21):214202.

[26] [26] K Nakajima, M Ohashi. Dopant dependence of effective nonlinear refractive index in GeO2- and F-doped core single-mode fibers［J］. IEEE Photonics Technology Letters,2002,14(4):492—494.

[27] [27] L. Dong. Stimulated thermal Rayleigh scattering in optical fibers［J］. Optics Express,2013,21(3):2642—2656.

[28] [28] C Shi, Rong Tao Su, Han Wei Zhang, et al. Experimental study of output characteristics of bi-directional pumping high power fiber amplifier in different pumping schemes［J］. IEEE Photonics Journal,2017,9(3):1—10.

[29] [29] Xuexue Luo, Rumao Tao, Xiaoming Xi, et al. Experimental study of mode instability in high power all-fiber amplifier under different pumping power distribution［C］∥High-Power Lasers and Applications IX. Beijing,China:Proc.SPIE,2018:1081109.

[30] [30] Ali Roohforouz, Reza Eyni Chenar, Reza Rezaei-Nasirabad, et al. The effect of population inversion saturation on the transverse mode instability threshold in high power fiber laser oscillators［J］. Sci Rep,2021,11:21116.

[31] [31] F Beier, C Hupel, J Nold, et al. Narrow linewidth, single mode 3kW average power from a directly diode pumped ytterbium-doped low NA fiber amplifier［J］. Optics Express,2016,24(6):6011—6020.

[32] [32] P Dragic, M Cavillon, J Ballato. On the thermo-optic coefficient of P2O5 in SiO2［J］. Opt. Mater. Express,2017,7(10):3654—3661.

[33] [33] Andrey Kobyakov, Michael Sauer, Dipak Chowdhury, Stimulated Brillouin scattering in optical fibers［J］. Adv. Opt. Photon.,2010,2(1):1—59.

[34] [34] Zhang C, Xie L, Li H, et al. SRS-induced spatial-spectral distortion and its mitigation strategy in high-power fiber amplifiers［J］. IEEE Photonics Journal,2022,14(2):3016605.

[35] [35] Hejaz K, Shayganmanesh M, Rezaei-nasirabad R, et al. Modalinstability induced by stimulated Raman scattering in high-power Yb-doped fiber amplifiers［J］. Optics Letters,2017,42(24):5274—5277.

[36] [36] B M Anderson, N A Naderi, A Flores. Nonlinear characterization of a kilowatt-class amplifier based on laser gain competition［C］∥Conference on Lasers and Electro-Optics (CLEO), San Jose, USA：Optica Publishing Group,2018:SW4K.3.

[37] [37] Tino Eidam, Christian Wirth, Cesar Jauregui, et al. Experimental observations of the threshold-like onset of mode instabilities in high power fiber amplifiers［J］. Optics Express,2011,19(14):13218—13224.

[38] [38] Yuya Takubo, Shinya Ikoma, Keisuke Uchiyama, et al. 5-kW single-mode fiber laser［J］. Fujikura Technical Review,2018,48:33—35.

[39] [39] Baolai Yang, Chen Shi, Hanwei Zhang, et al. Monolithic fiber laser oscillator with record high power［J］. Laser Physics Letters,2018,15(7):75106.

[40] [40] Y Wang, R. Kitahara, W Kiyoyama, et al. 8kW single-stage all-fiber Yb-doped fiber laser with a BPP of 0.50 mm-mrad［C］∥ Fiber Lasers XVII: Technology and Systems. San Francisco,USA:Proc.SPIE,2020:1126022.

[41] [41] Yang Baolai, Wang Xiaolin, Ye Yun, et al. Laser power from all-fiber oscillators breaks through 6kW［J］. Chinese Journal of Lasers,2020,47(1):0116001.

[42] [42] Xi Xiaoming, Wang Peng, Yang Baolai, et al. Output power of all fiber laser oscillator exceeds 7kW［J］. Chinese Journal of Lasers,2021,48(1):0116001.

[43] [43] Ding Xin-Yi, Wang Li, Zeng Ling-Fa, et al. Double-ended output near-single-mode quasi-continuouswave monolithic fiber laser［J］. Acta Phys. Sin.,2023,72(15):154205.

[44] [44] Wang Feng, Li Min, Yang Kangwen, et al. All-fiber high-energy femtosecond pulse amplification system［J］. Optical Technique,2021,47(03):293—298.

[45] [45] Liu Jiaqi, Zeng Lingfa, Shi Chen, et al. A bidirectional output all-fiber laser oscillator with record output power of 8 kW［J］. High Power Laser and Particle Beams,2023,35(8):081003.

[46] [46] Lin Honghuan, Tang Xuan, Li Chengyu, et al. The localization single-fiber laser system obtained 10.6kW laser output［J］. Chinese Journal of Lasers,2018,45(3):0315001.

[47] [47] Li Fengyun, Li Yue, Song Huaqing, et al. National optical fiber materials and devices achieve high SRS suppression ratio and 20.88kW output［J］. Chinese Journal of Lasers,2021,48(21):2116002.

[48] [48] Wang Peng, Xi Xiaoming, Zhang Hanwei, et al. Laser-diode- pumped fiber laser amplifier for 13kW high-beam-quality output［J］. High Power Laser and Particle Beams,2022,34,(12):121001.

[49] [49] Xi Xiaoming, Yang Baolai, Zhang Hanwei, et al. 20 kW monolithic fiber amplifier directly pumped by LDs［J］. High Power Laser and Particle Beams,2023,35,(2):021001.

[50] [50] Chen Xiaolong, Lou Fengguang, He Yu, et al. Home-made 10 kW fiber laser with high efficiency［J］. Acta Optica Sinica,2019,39(3):0336001.

[51] [51] Huang Liangjin, Wu Hanshuo, Li Ruixian, et al. Homemade confined-doped fiber for 10 kW level fiber laser output with good beam quality［J］. High Power Laser and Particle Beams,2022,34,(11):111002.

[52] [52] Reza Rezaei-Nasirabad, Saeed Azizi, Ali Hamedani Golshan, et al. 3kW bi-directional pumped single mode fiber amplifier; technical challenges and solutions［C］∥Laser Congress 2021(ASSL,LAC), (Optica Publishing Group, 2021):JTu1A.20.

[53] [53] Li Fengyun, Dai Jiangyun, Liu Nian, et al. The self-developed optical fiber achieves high SRS rejection of 21.39 kW laser output［J］. Chinese Journal of Lasers,2022,49(20):2016004.