[1] Fermann M E, Hartl I. Ultrafast fibre lasers[J]. Nature Photonics, 7, 868-874(2013).

[2] Phillips K C, Gandhi H H, Mazur E et al. Ultrafast laser processing of materials: a review[J]. Advances in Optics and Photonics, 7, 684-712(2015).

[3] Mao D, Wang H Q, Zhang H Z et al. Synchronized multi-wavelength soliton fiber laser via intracavity group delay modulation[J]. Nature Communications, 12, 6712(2021).

[4] Yun L. Generation of vector dissipative and conventional solitons in large normal dispersion regime[J]. Optics Express, 25, 18751-18759(2017).

[5] Yang H R, Qi M T, Li X P et al. Soliton interaction in a MXene-based mode-locked fiber laser[J]. Optics Express, 31, 38688-38698(2023).

[6] Li L, Pang L H, Wang R F et al. Ternary transition metal dichalcogenides for high power vector dissipative soliton ultrafast fiber laser[J]. Laser & Photonics Reviews, 16, 2100255(2022).

[7] Huang T, Lin N, Zhang Q Y et al. Progress in semiconductor saturable absorption mirror mode-locked laser[J]. Laser & Optoelectronics Progress, 61, 0900008(2024).

[8] Mao D, He Z W, Zhang Y S et al. Phase-matching-induced near-chirp-free solitons in normal-dispersion fiber lasers[J]. Light: Science & Applications, 11, 25(2022).

[9] Yu Y Q, Zheng J R, Du C L et al. Research and progress of carbon nanotubes passively mode-locked fiber laser[J]. Laser & Infrared, 41, 953-960(2011).

[10] Gao Q, Yang H, Hu C C et al. Physical vapor deposition of large-scale PbSe films and its applications in pulsed fiber lasers[J]. Nanophotonics, 9, 2367-2375(2020).

[11] Dong Z P, Lin J Q, Li H X et al. Er-doped mode-locked fiber lasers based on nonlinear polarization rotation and nonlinear multimode interference[J]. Optics & Laser Technology, 130, 106337(2020).

[12] Tao J N, Song Y Q, Li Y Y et al. Pulse type switchable, spectral bandwidth dynamically adjustable all-fiber laser mode-locked by NALM[J]. Optics & Laser Technology, 157, 108682(2023).

[13] Rudy C W, Urbanek K E, Digonnet M J F et al. Amplified 2-μm thulium-doped all-fiber mode-locked figure-eight laser[J]. Journal of Lightwave Technology, 31, 1809-1812(2013).

[14] Ren X H, Li H H, Zhang Z Y et al. Generation of bound solitons in a mode- locked Tm-doped fiber laser based on a graded-index multimode fiber saturable absorber[J]. Optics & Laser Technology, 149, 107865(2022).

[15] Chen T, Wei X H, Zhang X et al. Evolution of noise-like pulses in mode-locked fiber laser based on straight graded-index multimode fiber structure[J]. Optics & Laser Technology, 143, 107347(2021).

[16] Nazemosadat E, Mafi A. Nonlinear multimodal interference and saturable absorption using a short graded-index multimode optical fiber[J]. Journal of the Optical Society of America B, 30, 1357-1367(2013).

[17] Wang Z K, Wang D N, Yang F et al. Er-doped mode-locked fiber laser with a hybrid structure of a step-index‒graded-index multimode fiber as the saturable absorber[J]. Journal of Lightwave Technology, 35, 5280-5285(2017).

[18] Yang F, Wang D N, Wang Z K et al. Saturable absorber based on a single mode fiber‒graded index fiber‒single mode fiber structure with inner micro-cavity[J]. Optics Express, 26, 927-934(2018).

[19] Zhu T Y, Wang Z K, Wang D N et al. Observation of controllable tightly and loosely bound solitons with an all-fiber saturable absorber[J]. Photonics Research, 7, 61-68(2018).

[20] Jiang H, Li H H, Hu F M et al. Mode-locked Tm fiber laser with a tapered GIMF SA based on nonlinear multimode interference effect[J]. IEEE Photonics Technology Letters, 32, 503-506(2020).

[21] Gan Y P, Wu Q C, Yao Y et al. Generation of high-order solitons with order continuously adjustable in a fiber laser based on GIMF‒SIMF‒GIMF saturable absorber[J]. Optics Communications, 479, 126441(2021).

[22] Chen H Y, Hayat Q, Wang J C et al. 976-nm pulse-type switchable all-fiber mode-locked laser based upon nonlinear multimode interference[J]. Infrared Physics & Technology, 136, 105099(2024).

[23] Tu Q, Zhu Y H, Chang J H et al. Mode-locked fiber lasers based on graded index multimode fiber[J]. Acta Optica Sinica, 44, 2014001(2024).

[24] Zhao W, Chen G W, Li W L et al. All-fiber saturable absorbers for ultrafast fiber lasers[J]. IEEE Photonics Journal, 11, 7104019(2019).

[25] Shemirani M B, Mao W, Panicker R A et al. Principal modes in graded-index multimode fiber in presence of spatial- and polarization-mode coupling[J]. Journal of Lightwave Technology, 27, 1248-1261(2009).

[26] Boscolo S, Finot C, Karakuzu H et al. Pulse shaping in mode-locked fiber lasers by in-cavity spectral filter[J]. Optics Letters, 39, 438-441(2014).

[27] Ozgören K, Ilday F O. All-fiber all-normal dispersion laser with a fiber-based Lyot filter[J]. Optics Letters, 35, 1296-1298(2010).

[28] Wang Z Q, Zhan L, Fang X et al. Spectral filtering effect on mode-locking regimes transition: similariton-dissipative soliton fiber laser[J]. Journal of the Optical Society of America B, 34, 2325-2333(2017).