RAO Bing-jie, ZHANG Yan-yan, YAN Lu-lu, WU Yue-long, ZHANG Pan, FAN Song-tao, GUO Wen-ge, ZHANG Xiao-fei, ZHANG Shou-gang, JIANG Hai-feng. Er: fiber Femtosecond Optical Frequency Comb Aimed at Measurement of Frequency of D1 Line in Li Atoms[J]. Acta Photonica Sinica, 2019, 48(1): 114003