Optical state selection process with optical pumping in a cesium atomic fountain clock

• 作者: Lei Han Fang Fang Wei-Liang Chen Kun Liu Ya-Ni Zuo Fa-Song Zheng Shao-Yang Dai Tian-Chu Li
• 来源期刊: 中国物理B（英文版）
• 年，卷（期）: 2021,（8）
• 所属期刊栏目: GENERAL
• 页码范围: 302-308
• 页数: 7页
• 语种: 英文
• DOI: 10.1088/1674-1056/ac0698

摘要

We propose and realize a new optical state selection method on a cesium atomic fountain clock by applying a two-laser 3-3'optical pumping configuration to spin polarize atoms.The atoms are prepared in |F =3,mF =0> clock state with optical pumping directly after being launched up,followed by a pushing beam to push away the atoms remaining in the |F =4> state.With a state selection efficiency exceeding 92％,this optical method can substitute the traditional microwave state selection,and helps to develop a more compact physical package.A Ramsey fringe has been achieved with this optical state selection method,and a contrast of 90％ is obtained with a full width half maximum of 0.92 Hz.The short-term frequency stability of 6.8 × 10-14 (τ/s)-1/2 is acquired.In addition,the number of detected atoms is increased by a factor of 1.7 with the optical state selection.