Wang Kai-Nan, Cheng Bing, Zhou Yin, Chen Pei-Jun, Zhu Dong, Weng Kan-Xing, Wang He-Lin, Peng Shu-Ping, Wang Xiao-Long, Wu Bin, Lin Qiang. Phase locking technology for Raman laser system based on 1560 nm external cavity lasersJ. Acta Physica Sinica, 2021, 70(17): 170303. DOI: 10.7498/aps.70.20210432