[1] Scholle K, Lamrini S, Koopmann P, Pal B et al. 2 µm laser sources and their possible applications[M]. Frontiers in guided wave optics and optoelectronics, 471(2010).

[2] Sun W W, Feng T, Li D Y et al. 2-μm-band hybrid compound-resonating-cavity single-longitudinal-mode fiber laser[J]. Laser & Optoelectronics Progress, 60, 0514006(2023).

[3] Dong Y J, Bai X T, Zheng Y. Research progress of high power continuous wave thulium-doped fiber laser[J]. Laser & Optoelectronics Progress, 60, 2300005(2023).

[4] Lippert E, Nicolas S, Arisholm G et al. Midinfrared laser source with high power and beam quality[J]. Applied Optics, 45, 3839-3845(2006).

[5] Lemieux-Tanguay M, Fortin V, Boilard T et al. 15 W monolithic fiber laser at 3.55 µm[J]. Optics Letters, 47, 289-292(2022).

[6] Barrientos Barria J, Mammez D, Cadiou E et al. Multispecies high-energy emitter for CO₂, CH₄, and H₂O monitoring in the 2 μm range[J]. Optics Letters, 39, 6719-6722(2014).

[7] McComb T S, Shah L, Sims R A et al. Atmospheric propagation testing with a high power, tunable thulium fiber laser system[J]. Proceedings of SPIE, 7578, 75781G(2010).

[8] Cheng D, Yan F P, Feng T et al. Single-longitudinal mode thulium-doped fiber laser in 2050 nm band based on passive compound triple-ring cavity[J]. Chinese Journal of Luminescence, 43, 247-254(2022).

[9] Jackson S D, King T A. Theoretical modeling of Tm-doped silica fiber lasers[J]. Journal of Lightwave Technology, 17, 948-956(1999).

[10] Ehrenreich T, Leveille R, Majid I et al. 1 kW, all-glass thulium-doped fiber laser[EB/OL]. https:∥www.doc88.com/p-9963638496080.html

[11] Ren C Y, Shen Y Q, Zheng Y H et al. Widely-tunable all-fiber Tm doped MOPA with >1 kW of output power[J]. Optics Express, 31, 22733-22739(2023).

[12] Chen M, Li J F, Wang Y S et al. Progress of high-order mode-suppression technology in high-power large mode field fiber lasers[J]. Laser & Optoelectronics Progress, 49, 080002(2012).

[13] Romano C, Tench R E, Jaouën Y et al. Simulation and design of a multistage 10 W thulium-doped double clad silica fiber amplifier at 2050 nm[J]. Proceedings of SPIE, 10083, 100830H(2017).

[14] Nürnberg F, Kühn B, Langner A et al. Bulk damage and absorption in fused silica due to high-power laser applications[J]. Proceedings of SPIE, 9632, 96321R(2015).

[15] Fang Q, Shi W, Kieu K et al. High power and high energy monolithic single frequency 2 μm nanosecond pulsed fiber laser by using large core Tm-doped germanate fibers: experiment and modeling[J]. Optics Express, 20, 16410-16420(2012).

[16] Wang W J. Theoretical research on thulium-doped fiber lasers[D], 26(2009).

[17] Khamis M A, Ennser K. Theoretical model of a thulium-doped fiber amplifier pumped at 1570 nm and 793 nm in the presence of cross relaxation[J]. Journal of Lightwave Technology, 34, 5675-5681(2016).