Rockn aims to atomic clocks portable8/26/2023 Cesium beam atomic clocks can be divided into two types: magnetic state-selection and optically pumped. Its excellent medium and long-term frequency stability can not be completely replaced by other atomic clocks. The portable cesium beam atomic clock occupies an important position in the field of time and frequency. The compact optically pumped cesium beam atomic clock of Peking University is expected to contribute to the field of timing, positioning, navigation and high speed digital communication. The methods of obtaining the good long-term frequency stability are controlling the microwave power based on the atomic transition probability, controlling the C-field intensity based on Zeeman frequency and controlling the laser power using fluorescence. The optimization methods of the short-term frequency stability are using laser induced beam spectrum to stabilize the laser frequency, using cyclic transition to detect the atomic state and using a cesium oven with a collimator to generate the cesium atomic beam. At present, the short-term frequency stability is 3 × 10 − 12 / τ and the long-term (5-day) frequency stability can reach 7 × 10 −15. The research of optically pumped cesium beam atomic clock (OPCB) at Peking University has lasted for decades. 2Institute of Fundamental Experiment Education, Peking University, Beijing, China.1Institute of Quantum Electronics, Peking University, Beijing, China.Xuan He 1, Zhichao Yuan 1, Jiayuan Chen 1, Shengwei Fang 1, Xuzong Chen 1, Qing Wang 2* and Xianghui Qi 1*
0 Comments
Leave a Reply.AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |