Recent progress in optically-pumped cesium beam clock at Peking University

8th Symposium on Frequency Standards and Metrology 2015

Liu, C.^1 ; Zhou, S.^1 ; Wan, J.^1 ; Wang, S.^1 ; Wang, Y.^1

School of Electronics Engineering and Computer Science, Peking University, Beijing, China^1

关键词: Laser frequency;    Long term stability;    Magnetic state;    Microwave power;    Optically pumped;    Peking University;    Recent progress;    Short term stability;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/723/1/012011/pdf
DOI  :  10.1088/1742-6596/723/1/012011

来源: IOP

【 摘 要 】

A compact, long-life, and low-drift cesium beam clock is investigated at Peking University, where the atoms are magnetic-state selected and optically detected. Stability close to that of the best commercial cesium clocks has been achieved from 10 to 105s. As previously shown, the short-term stability is determined by atomic shot noise or laser frequency noise. The stabilizations of microwave power and C-field improve the long-term stability, with the help of a digital servo system based on field-programmable gate array.