[1] Li C, Xu S H, Huang X et al. All-optical frequency and intensity noise suppression of single-frequency fiber laser[J]. Optics Letters, 40, 1964-1967(2015).

[2] Gouhier B, Guiraud G, Rota-Rodrigo S et al. 25 W single-frequency, low noise fiber MOPA at 1120 nm[J]. Optics Letters, 43, 308-311(2018).

[3] Gouhier B, Rota-Rodrigo S, Guiraud G et al. Low-noise single-frequency 50 W fiber laser operating at 1013 nm[J]. Laser Physics Letters, 16, 045103(2019).

[4] Wei L W, Cleva F, Man C N. Coherently combined master oscillator fiber power amplifiers for Advanced Virgo[J]. Optics Letters, 41, 5817-5820(2016).

[5] Krupa K, Bettenzana M, Tonello A et al. Four-wave mixing in nonlinear fiber with two intracavity frequency-shifted laser pumps[J]. IEEE Photonics Technology Letters, 24, 258-260(2012).

[6] Wu T, Peng X, Gong W et al. Observation and optimization of 4He atomic polarization spectroscopy[J]. Optics Letters, 38, 986-988(2013).

[7] Uberna R, Bratcher A, Tiemann B G. Power scaling of a fiber master oscillator power amplifier system using a coherent polarization beam combination[J]. Applied Optics, 49, 6762-6765(2010).

[8] Zheng Y, Zhu Z D, Liu X X et al. High-power, high-beam-quality spectral beam combination of six narrow-linewidth fiber amplifiers with two transmission diffraction gratings[J]. Applied Optics, 58, 8339-8343(2019).

[9] Fu S J, Shi W, Feng Y et al. Review of recent progress on single-frequency fiber lasers[J]. Journal of the Optical Society of America B, 34, A49-A62(2017).

[10] Rothenberg J E, Thielen P A, Michael W et al. Suppression of stimulated Brillouin scattering in single-frequency multi-kilowatt fiber amplifiers[J]. Proceedings of SPIE, 6873, 68730O(2008).

[11] Huang L, Wu H S, Li R X et al. 414 W near-diffraction-limited all-fiberized single-frequency polarization-maintained fiber amplifier[J]. Optics Letters, 42, 1-4(2017).

[12] Zhao X, Yang Y F, Shen H et al. 302 W triple-frequency, single-mode, linearly polarized Yb-doped all-fiber amplifier[J]. High Power Laser Science and Engineering, 5, e31(2017).

[13] Liu A P. Suppressing stimulated Brillouin scattering in fiber amplifiers using nonuniform fiber and temperature gradient[J]. Optics Express, 15, 977-984(2007).

[14] Xiao R, Hou J, Liu M et al. Coherent combining technology of master oscillator power amplifier fiber arrays[J]. Optics Express, 16, 2015-2022(2008).

[15] Tünnermann H, Pöld J H, Neumann J et al. Beam quality and noise properties of coherently combined ytterbium doped single frequency fiber amplifiers[J]. Optics Express, 19, 19600-19606(2011).

[16] Ma P F, Wang X L, Ma Y X et al. Analysis of multi-wavelength active coherent polarization beam combining system[J]. Optics Express, 22, 16538-16551(2014).

[17] Wu W D, Han P G, Shi M et al. Design and performance analysis of a single-unit polarizing beam-splitting prism based on negative refraction in a uniaxial crystal[J]. Applied Optics, 58, 7063-7066(2019).

[18] Wu W D, Wu F Q, Shi M et al. A unit structure Rochon prism based on the extraordinary refraction of uniaxial birefringent crystals[J]. Optics Express, 21, 13162-13168(2013).

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

[20] Yang Y, Geng C, Li F et al. Combining module based on coherent polarization beam combining[J]. Applied Optics, 56, 2020-2028(2017).

[21] Haraguchi E, Akiyama T, Ando T et al. Simultaneous detection of beam pointing and optical phase errors for multiple beams using a quadrant photo detector for high-efficiency coherent beam combining systems[J]. Applied Physics Express, 12, 102012(2019).

[22] Ma P F, Zhou P, Wang X L et al. Coherent polarization beam combining of four 200-W-level fiber amplifiers[J]. Applied Physics Express, 7, 022703(2014).

[23] Shen H, Quan Z, Yang Y F et al. Polarization control of combined laser beams based on optical homodyne polarization detection and phase locking[J]. Infrared and Laser Engineering, 47, 0103007(2018).

[24] Jiang M H, Su Y, Lu F. Influence of polarization on laser beam coherentcombining[J]. High Power Laser and Particle Beams, 25, 611-614(2013).

[25] Zhu J, Du W, Dong X et al. Effect of the polarization-state fluctuation on coherent beam combining of fiber lasers[J]. Proceedings of SPIE, 8192, 819237(2011).

[26] Ma P F, Zhou P, Ma Y X et al. Analysis of the effects of aberrations on coherent polarization beam combining of fiber laser beams[J]. Applied Optics, 51, 3546-3551(2012).