Yanshan Wang, Wanjing Peng, Jue Wang, Xiaobo Yang, Hongming Yu, Hang Liu, Ankang Yu, Yao Wang, Tenglong Li, Jiangcai Wei, Yujun Feng, Yinhong Sun, Yi Ma, Qingsong Gao, Chun Tang. Output of 4 kW <10 GHz narrow linewidth linear polarization near diffraction limit fiber laser[J]. High Power Laser and Particle Beams, 2023, 35(8): 089901