Xu Qin-Fang, Yin Mo-Juan, Kong De-Huan, Wang Ye-Bing, Lu Ben-Quan, Guo Yang, Chang Hong. Optical frequency comb active filtering and amplification for second cooling laser of strontium optical clockJ. Acta Physica Sinica, 2018, 67(8): 080601. DOI: 10.7498/aps.67.20172733