[1] Max C E, Olivier S S, Friedman H W, et al. Image improvement from a sodium-layer laser guide star adaptive optics system[J]. Science, 277, 1649-1652(1997).

[2] Neichel B, Lu J R, Rigaut F, et al. Astrometric performance of the Gemini multiconjugate adaptive optics system in crowded fields[J]. Monthly Notices of the Royal Astronomical Society, 445, 500-514(2014).

[3] [3] Denman C A, Hillman P D, Moe G T, et al. Realization of a 50watt facilityclass sodium guidestar pump laser[C]Proceedings of SPIE 5707, Solid State Lasers XIV: Technology Devices. 2005: 4649.

[4] [4] Hankla A K, Bartholomew J, Groff K, et al. 20W 50W solidstate sodium beacon guidestar laser systems f the Keck I Gemini South Telescopes[C]Proceedings of SPIE 6272, Advances in Adaptive Optics II. 2006: 62721G.

[5] Taylor L R, Feng Y, Calia D B. 50W CW visible laser source at 589nm obtained via frequency doubling of three coherently combined narrow-band Raman fibre amplifiers[J]. Optics Express, 18, 8540-8555(2010).

[6] Zhang Lei, Jiang Huawei, Cui Shuzhen, et al. Versatile Raman fiber laser for sodium laser guide star[J]. Laser & Photonics Reviews, 8, 889-895(2014).

[7] Bian Qi, Bo Yong, Zuo Junwei, et al. High-power QCW microsecond-pulse solid-state sodium beacon laser with spiking suppression and D_2b re-pumping[J]. Optics Letters, 41, 1732-1735(2016).

[8] Andrusyak O, Smirnov V, Venus G, et al. Spectral combining and coherent coupling of lasers by volume Bragg gratings[J]. IEEE Journal of Selected Topics in Quantum Electronics, 15, 344-353(2009).

[9] Ma Yi, Yan Hong, Tian Fei, . Common aperture spectral beam combination of fiber lasers with 5 kW power high-efficiency and high-quality output[J]. High Power Laser and Particle Beams, 27, 040101(2015).

[10] [10] Honea E, Afzal R S, SavageLeuchs M, et al. Advances in fiber laser spectral beam combining f power scaling[C]Proceedings of SPIE 9730, Components Packaging f Laser Systems II. 2016: 97300Y.

[11] [11] Marmo J, Injeyan H, Komine H, et al. Joint high power solid state laser program advancements at Nthrop Grumman[C]Proceedings of SPIE 7195, Fiber Lasers VI: Technology, Systems, Applications. 2009: 719507.

[12] Yu C X, Augst S J, Redmond S M, et al. Coherent combining of a 4 kW, eight-element fiber amplifier array[J]. Optics Letters, 36, 2686-2688(2011).

[13] Wang Xiaolin, Zhou Pu, Ma Yanxing, . Investigation of coherent beam combining pulsed fiber lasers with active phase control[J]. Journal of National University of Defense Technology, 34, 33-37(2012).

[14] Uberna R, Bratcher A, Tiemann B G. Coherent polarization beam combination[J]. IEEE Journal of Quantum Electronics, 46, 1191-1196(2010).

[15] Yan Hong, Ye Yidong, Lu Fei, . Coherent beam combining based on polarization phase discrimination[J]. High Power Laser and Particle Beams, 25, 5-8(2013).

[16] Ma Pengfei, Wang Xiaolin, Su Rongtao, . Coherent polarization beam combining of fiber lasers to 2 kW power-level[J]. High Power Laser And Particle Beams, 28, 040102(2016).

[17] Wirth C, Schmidt O, Tsybin I, et al. 2 kW incoherent beam combining of four narrow-linewidth photonic crystal fiber amplifiers[J]. Optics Express, 17, 1178-1183(2009).

[18] Sprangle P, Ting A, Penano J, et al. Incoherent combining and atmospheric propagation of high-power fiber lasers for directed-energy applications[J]. IEEE Journal of Quantum Electronics, 45, 138-148(2009).

[19] Xu Jian, Gao Hongwei, Xu Yiting, et al. Sequence combining of pulsed lasers using refraction-beam-displacement[J]. Applied Optics, 52, 208-211(2013).

[20] Fan Tingwei, Zhou Tianhua, Feng Yan. Improving sodium laser guide star brightness by polarization switching[J]. Scientific Reports, 6, 19859(2016).

[21] Calia D B, Hackenberg W, Holzlöhner R, et al. The four-laser guide star facility: design considerations and system implementation[J]. Advanced Optical Technologies, 3, 345-361(2014).

[22] Bian Qi, Bo Yong, Zuo Junwei, et al. First implementation of pulsed sodium guidestars constellation for large-aperture multi-conjugate adaptive optics telescopes[J]. Publications of the Astronomical Society of the Pacific, 134, 074502(2022).