High-performance coherent population trapping clock based on laser-cooled atoms |
| |
Affiliation: | 1.Center for Advanced Measurement Science, National Institute of Metrology, Beijing 100029, China;2.National Time Service Center, Chinese Academy of Sciences, Xi'an 710600, China;3.College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou 310018, China |
| |
Abstract: | We present a coherent population trapping clock system based on laser-cooled $^{87}$Rb atoms. The clock consists of a frequency-stabilized CPT interrogation laser and a cooling laser as well as a compact magneto-optical trap, a high-performance microwave synthesizer, and a signal detection system. The resonance signal in the continuous wave regime exhibits an absorption contrast of $sim 50$%. In the Ramsey interrogation method, the linewidth of the central fringe is 31.25 Hz. The system achieves fractional frequency stability of ${2.4times }{{10}}^{{-11}}/sqrt tau $, which goes down to ${1.8times }{{10}}^{{-13}}$ at 20000 s. The results validate that cold atom interrogation can improve the long-term frequency stability of coherent population trapping clocks and holds the potential for developing compact/miniature cold atoms clocks. |
| |
Keywords: | coherent population trapping atomic clock cold atoms microwave synthesizer |
|
| 点击此处可从《中国物理 B》浏览原始摘要信息 |
|
点击此处可从《中国物理 B》下载免费的PDF全文 |
|