[1] Zhang Xiujuan, Duan Yunfeng, Zhao Shui, . Experimental study on high efficient all-fiber lasers at 1018 nm[J]. Acta Optica Sinica, 36, 0414002(2016).

[2] [2] Christensen S, Frith G, Samson B. Developments in thuliumdoped fiber lasers offer higher powers[C]Proceedings of the 21st Annual Meeting of the LEOS, IEEE Lasers ElectroOptics Society. 2008.

[3] Liu Jiang, Liu Kun, Tan Fangzhou, . Hundred-watt-level all-fiber thulium-doped fiber laser and superfluorescent source[J]. Chinese Journal of Lasers, 41, 0402005(2014).

[4] Brown D C, Hoffman H J. Thermal, stress, and thermo-optic effects in high average power double-clad silica fiber lasers[J]. IEEE Journal of Quantum Electronics, 37, 207-217(2001).

[5] Hu Zhitao, He Bing, Zhou Jun, . Research progress in thermal effect of high power fiber lasers[J]. Laser & Optoelectronics Progress, 53, 080002(2016).

[6] [6] Zhang Xuan. Study on nonlinear effect transverse mode instability in high power thuliumdoped fiber laser[D]. Beijing: Beijing Jiaotong University, 2021

[7] Bowers M S, Luzod N M. Stimulated Brillouin scattering in optical fibers with end reflections excited by broadband pump waves[J]. Optical Engineering, 58, 102702(2019).

[8] Yang Yifeng, Li Binglin, Liu Meizhong, et al. Optimization and visualization of phase modulation with filtered and amplified maximal-length sequence for SBS suppression in a short fiber system: a theoretical treatment[J]. Optics Express, 29, 16781-16803(2021).