[1] Jauregui C, Limpert J, Tünnermann A. High-power fibre lasers[J]. Nature Photonics, 7, 861-867(2013).

[2] 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).

[3] 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).

[4] Tao R M, Ma P F, Wang X L et al. 1.3 kW monolithic linearly polarized single-mode master oscillator power amplifier and strategies for mitigating mode instabilities[J]. Photonics Research, 3, 86-93(2015).

[5] Ma X Q, Zhu C, Hu I N et al. Single-mode chirally-coupled-core fibers with larger than 50 µm diameter cores[J]. Optics Express, 22, 9206-9219(2014).

[6] Gu G C, Kong F T, Hawkins T et al. Ytterbium-doped large-mode-area all-solid photonic bandgap fiber lasers[J]. Optics Express, 22, 13962-13968(2014).

[7] Jain D, Jung Y, Nunez-Velazquez M et al. Extending single mode performance of all-solid large-mode-area single trench fiber[J]. Optics Express, 22, 31078-31091(2014).

[8] Wadsworth W J, Knight J C, Reeves W H et al. Yb3+-doped photonic crystal fibre laser[J]. Electronics Letters, 36, 1452-1454(2000).

[9] Limpert J, Schreiber T, Nolte S et al. High-power air-clad large-mode-area photonic crystal fiber laser[J]. Optics Express, 11, 818-823(2003).

[10] Stutzki F, Jansen F, Liem A et al. 26 mJ, 130 W Q-switched fiber-laser system with near-diffraction-limited beam quality[J]. Optics Letters, 37, 1073-1075(2012).

[11] Brooks C D, di Teodoro F. Multimegawatt peak-power, single-transverse-mode operation of a 100 μm core diameter, Yb-doped rodlike photonic crystal fiber amplifier[J]. Applied Physics Letters, 89, 111119(2006).

[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] Pedersen M E V, Johansen M M, Olesen A S et al. 175 W average power from a single-core rod fiber-based chirped-pulse-amplification system[J]. Optics Letters, 47, 5172-5175(2022).

[15] Chen W, Li S Y, Wang Y L et al. Design and fabrication of high numerical aperture and large mode-field Ytterbium-doped photonic crystal fibers[J]. Study on Optical Communications, 45-46(2009).

[16] Chen G, Jiang Z W, Peng J G et al. Study of air-clad large-mode-area ytterbium doped photonic crystal fiber[J]. Acta Physica Sinica, 61, 144206(2012).

[17] Liu J T, Zhou G Y, Xia C M. Fabrication of Yb3+/Al3+ co-doped large-mode-area photonic crystal fiber based on powder sintering technology[J]. Acta Photonica Sinica, 42, 552-554(2013).

[18] Wei H F, Chen K K, Yang Y C et al. All-solid very large mode area ytterbium-doped silica microstructured fiber based on accurate control on cladding index[J]. Optics Express, 24, 8978-8987(2016).

[19] Liu S J. Investigation on fabrication and spectroscopic properties of Yb3+-doped silica glass and PCF fiber by Sol-Gel method[D](2012).

[20] Wang S K, Lou F G, Wang M et al. Characteristics and laser performance of Yb3+-doped silica large mode area fibers prepared by sol-gel method[J]. Fibers, 1, 93-100(2013).

[21] Wang S K. Study on fabrication of Yb3+-doped silica glass and its large mode area photonic crystal fiber by sol-gel method[D](2014).

[22] Lou F G. Research on Yb3+, Tm3+ doped silica core glasses and their large mode area fibers by sol-gel method[D](2014).

[23] Xu W B. Study on performance of Yb3+-doped silica glass and its large mode area fiber prepared by sol-gel method combing powder sintering[D](2017).

[24] Wang F. Study on structure and spectroscopic properties of Yb3+ and Er3+ doped silica glass and its fiber laser performance[D](2019).

[25] Guo M T. Study on the influence mechanism of thermal history on the performance of Yb3+-doped silica glass and fiber[D](2021).

[26] Hu L L, Wang S K, Lou F G et al. Preparation method of Yb doped quartz fiber preform core rod[P].

[27] Wang S, Lou F, Yu C et al. Influence of Al3+ and P5+ ion contents on the valence state of Yb3+ ions and the dispersion effect of Al3+ and P5+ ions on Yb3+ ions in silica glass[J]. Journal of Materials Chemistry C, 2, 4406-4414(2014).

[28] Xu W B, Ren J J, Shao C Y et al. Effect of P5+ on spectroscopy and structure of Yb3+/Al3+/P5+ co-doped silica glass[J]. Journal of Luminescence, 167, 8-15(2015).

[29] Xu W B, Yu C L, Wang S K et al. Effects of F- on the optical and spectroscopic properties of Yb3+/Al3+-co-doped silica glass[J]. Optical Materials, 42, 245-250(2015).

[30] Wang F, Shao C Y, Yu C L et al. Effect of AlPO4 join concentration on optical properties and radiation hardening performance of Yb-doped Al2O3-P2O5-SiO2 glass[J]. Journal of Applied Physics, 125, 173104(2019).

[31] Hu L L[M]. Rare earth doped silica fiber and its applications(2023).

[32] Wang S K, Li Z L, Yu C L et al. Fabrication and laser behaviors of Yb3+ doped silica large mode area photonic crystal fiber prepared by sol-gel method[J]. Optical Materials, 35, 1752-1755(2013).

[33] Wang M. Preparation and properties of high brightness Ytterbium doped large mode area photonic crystal fiber[D](2019).

[34] Guo M T, Wang S K, Zhao T Y et al. Structural origin of thermally induced refractive index changes in Yb3+/Al3+/P5+/F--co-doped silica glass[J]. Journal of the American Ceramic Society, 104, 5016-5029(2021).

[35] Yu C L, Wang M, Feng S Y et al. Research progress on ytterbium-doped large mode area photonic crystal fibers[J]. Laser & Optoelectronics Progress, 56, 170602(2019).

[36] Wang S K, Feng S Y, Wang M et al. Optical and laser properties of Yb3+-doped Al2O3-P2O5-SiO2 large-mode-area photonic crystal fiber prepared by the sol-gel method[J]. Laser Physics Letters, 10, 115802(2013).

[37] Wang S K, Xu W B, Lou F G et al. Spectroscopic and laser properties of Al-P co-doped Yb silica fiber core-glass rod and large mode area fiber prepared by sol-gel method[J]. Optical Materials Express, 6, 69-78(2015).

[38] Xu W B, Wang M, Feng S Y et al. Fabrication and laser amplification behavior of Yb3+/Al3+ co-doped photonic crystal fiber[J]. IEEE Photonics Technology Letters, 28, 391-393(2016).

[39] Wang S K, Xu W B, Wang F et al. Yb3+-doped silica glass rod with high optical quality and low optical attenuation prepared by modified sol-gel technology for large mode area fiber[J]. Optical Materials Express, 7, 2012-2022(2017).

[40] Wang F, Hu L L, Xu W B et al. Manipulating refractive index, homogeneity and spectroscopy of Yb3+-doped silica-core glass towards high-power large mode area photonic crystal fiber lasers[J]. Optics Express, 25, 25960-25969(2017).

[41] Wang M, Wang F, Feng S Y et al. 272 W quasi-single-mode picosecond pulse laser of ytterbium-doped large-mode-area photonic crystal fiber[J]. Chinese Optics Letters, 17, 071401(2019).

[42] Wang M, Wang F, Yu C L et al. Ultra-low core numerical aperture large mode area photonic crystal fiber with 1 MW peak power output[J]. Acta Optica Sinica, 39, 0536001(2019).

[43] Wang F, Wang M, Shao C Y et al. Highly fluorine and ytterbium doped polarization maintaining large mode area photonic crystal fiber via the sol-gel process[J]. Optics Express, 29, 41882-41893(2021).

[44] Wang Z W, Li Q R, Wang Z K et al. 255 W picosecond MOPA laser based on self-made Yb-doped very-large-mode-area photonic crystal fiber[J]. Chinese Optics Letters, 14, 081401(2016).

[45] Yu C L, Wang S K, Wang M et al. Homogenization preparation method of rare earth doped quartz glass rods[P].