[1] Zervas M N, Codemard C A. High power fiber lasers: a review[J]. IEEE Journal of Selected Topics in Quantum Electronics, 20, 219-241(2014).
[2] Jauregui C, Limpert J, Tünnermann A. High-power fibre lasers[J]. Nature Photonics, 7, 861-867(2013).
[3] Zuo J X, Lin X C. High-power laser systems[J]. Laser & Photonics Reviews, 16, 2100741(2022).
[4] Jauregui C, Stihler C, Limpert J. Transverse mode instability[J]. Advances in Optics and Photonics, 12, 429-484(2020).
[5] Zervas M N. Transverse mode instability, thermal lensing and power scaling in Yb3+-doped high-power fiber amplifiers[J]. Optics Express, 27, 19019-19041(2019).
[6] Dong L, Ballato J, Kolis J. Power scaling limits of diffraction-limited fiber amplifiers considering transverse mode instability[J]. Optics Express, 31, 6690-6703(2023).
[7] Ye Y, Yang B L, Wang X L et al. Experimental study of SRS threshold dependence on the bandwidths of fiber Bragg gratings in co-pumped and counter-pumped fiber laser oscillator[J]. Journal of Optics, 21, 025801(2019).
[8] Li T L, Ke W W, Ma Y et al. Suppression of stimulated Raman scattering in a high-power fiber amplifier by inserting long transmission fibers in a seed laser[J]. Journal of the Optical Society of America B, 36, 1457-1465(2019).
[9] Wang M, Zhang Y J, Wang Z F et al. Fabrication of chirped and tilted fiber Bragg gratings and suppression of stimulated Raman scattering in fiber amplifiers[J]. Optics Express, 25, 1529-1534(2017).
[10] Nodop D, Jauregui C, Jansen F et al. Suppression of stimulated Raman scattering employing long period gratings in double-clad fiber amplifiers[J]. Optics Letters, 35, 2982-2984(2010).
[11] Li H, Wang M, Wu B Y et al. Femtosecond cascade chirped and tilted fiber Bragg gratings for Raman filtering[J]. Acta Optica Sinica, 43, 1036001(2023).
[12] Eidam T, Hanf S, Seise E et al. Femtosecond fiber CPA system emitting 830 W average output power[J]. Optics Letters, 35, 94-96(2010).
[13] Stutzki F, Otto H J, Jansen F et al. High-speed modal decomposition of mode instabilities in high-power fiber lasers[J]. Optics Letters, 36, 4572-4574(2011).
[14] Smith A V, Smith J J. Mode instability in high power fiber amplifiers[J]. Optics Express, 19, 10180-10192(2011).
[15] Jauregui C, Eidam T, Limpert J et al. The impact of modal interference on the beam quality of high-power fiber amplifiers[J]. Optics Express, 19, 3258-3271(2011).
[16] Eidam T, Wirth C, Jauregui C et al. Experimental observations of the threshold-like onset of mode instabilities in high power fiber amplifiers[J]. Optics Express, 19, 13218-13224(2011).
[17] Jauregui C, Eidam T, Otto H J et al. Physical origin of mode instabilities in high-power fiber laser systems[J]. Optics Express, 20, 12912-12925(2012).
[18] Ward B, Robin C, Dajani I. Origin of thermal modal instabilities in large mode area fiber amplifiers[J]. Optics Express, 20, 11407-11422(2012).
[19] Jansen F, Stutzki F, Otto H J et al. Thermally induced waveguide changes in active fibers[J]. Optics Express, 20, 3997-4008(2012).
[20] Naderi S, Dajani I, Grosek J et al. Theoretical analysis of effect of pump and signal wavelengths on modal instabilities in Yb-doped fiber amplifiers[J]. Proceedings of SPIE, 8964, 89641W(2014).
[21] Tao R M, Ma P F, Wang X L et al. Study of wavelength dependence of mode instability based on a semi-analytical model[J]. IEEE Journal of Quantum Electronics, 51, 1600106(2015).
[22] Hejaz K, Norouzey A, Poozesh R et al. Controlling mode instability in a 500 W ytterbium-doped fiber laser[J]. Laser Physics, 24, 025102(2014).
[23] Wan Y C, Yang B L, Xi X M et al. Transverse mode instability effect of fiber lasers with different pump wavelengths[J]. Infrared and Laser Engineering, 51, 20210256(2022).
[24] Wan Y C, Xi X M, Yang B L et al. Enhancement of TMI threshold in Yb-doped fiber laser by optimizing pump wavelength[J]. IEEE Photonics Technology Letters, 33, 656-659(2021).
[25] Roohforouz A, Chenar R E, Azizi S et al. Effect of pumping configuration on the transverse mode instability power threshold in a 3.02 kW fiber laser oscillator[C], JM5A.29(2019).
[26] Tao R M, Ma P F, Wang X L et al. Theoretical study of pump power distribution on modal instabilities in high power fiber amplifiers[J]. Laser Physics Letters, 14, 025002(2017).
[27] Shi C, Su R T, Zhang H W et al. Experimental study of output characteristics of bi-directional pumping high power fiber amplifier in different pumping schemes[J]. IEEE Photonics Journal, 9, 1502910(2017).
[28] Huang Z M, Shu Q A, Luo Y et al. 3.5 kW narrow-linewidth monolithic fiber amplifier at 1064 nm by employing a confined doping fiber[J]. Journal of the Optical Society of America B, 38, 2945-2952(2021).
[29] Zhang F F, Wang Y B, Lin X F et al. Gain-tailored Yb/Ce codoped aluminosilicate fiber for laser stability improvement at high output power[J]. Optics Express, 27, 20824-20836(2019).
[30] Zhang Z L, Lin X F, Zhang X et al. Low-numerical aperture confined-doped long-tapered Yb-doped silica fiber for a single-mode high-power fiber amplifier[J]. Optics Express, 30, 32333-32346(2022).
[31] Tao R M, Su R T, Ma P F et al. Suppressing mode instabilities by optimizing the fiber coiling methods[J]. Laser Physics Letters, 14, 025101(2017).
[32] Wang X L, Wen Y J, Zhang H W et al. Yb-doped fiber laser with variable core diameter: present situation and trend[J]. Chinese Journal of Lasers, 49, 2100001(2022).
[33] Zhang Z L, Lin X F, Li W Z et al. Realization of 4 kW near diffraction limit laser output with low numerical aperture partially doped spindle fiber[J]. Chinese Journal of Lasers, 49, 1315002(2022).
[34] Su R T, Tao R M, Wang X L et al. 2.43 kW narrow linewidth linearly polarized all-fiber amplifier based on mode instability suppression[J]. Laser Physics Letters, 14, 085102(2017).
[35] Beier F, Hupel C, Nold J et al. Narrow linewidth, single mode 3 kW average power from a directly diode pumped ytterbium-doped low NA fiber amplifier[J]. Optics Express, 24, 6011-6020(2016).
[36] Wang J M, Yan D P, Xiong S S et al. Mode instability in high power all-fiber amplifier with large-mode-area gain fiber[J]. Optics Communications, 396, 123-126(2017).
[37] Haarlammert N, Sattler B, Liem A et al. Optimizing mode instability in low-NA fibers by passive strategies[J]. Optics Letters, 40, 2317-2320(2015).
[38] Zhang F F, Xu H Z, Xing Y B et al. Bending diameter dependence of mode instabilities in multimode fiber amplifier[J]. Laser Physics Letters, 16, 035104(2019).
[39] Wen Y J, Wang P, Shi C et al. Experimental study on transverse mode instability characteristics of few-mode fiber laser amplifier under different bending conditions[J]. IEEE Photonics Journal, 14, 1539106(2022).
[40] Wen Y J, Wang P, Xi X M et al. High beam quality 10,000-watt fiber laser directly pumped by laser diode[J]. Acta Physica Sinica, 71, 244202(2022).
[41] Chu Q H, Tao R M, Li C Y et al. Experimental study of the influence of mode excitation on mode instability in high power fiber amplifier[J]. Scientific Reports, 9, 9396(2019).
[42] Wu H S, Li H B, An Y et al. Transverse mode instability mitigation in a high-power confined-doped fiber amplifier with good beam quality through seed laser control[J]. High Power Laser Science and Engineering, 10, e44(2022).
[43] Tao R M, Ma P F, Wang X L et al. Comparison of the threshold of thermal-induced mode instabilities in polarization-maintaining and non-polarization-maintaining active fibers[J]. Journal of Optics, 18, 065501(2016).
[44] Chu Q H, Shu Q A, Chen Z et al. Experimental study of mode distortion induced by stimulated Raman scattering in high-power fiber amplifiers[J]. Photonics Research, 8, 595-600(2020).
[45] Beyer E, Mahrle A, Lütke M et al. Innovations in high power fiber laser applications[J]. Proceedings of SPIE, 8237, 823717(2012).