›› 2015, Vol. 24 ›› Issue (1): 10602-010602.doi: 10.1088/1674-1056/24/1/010602

• GENERAL • 上一篇    下一篇

Design and test of the microwave cavity in an optically-pumped Rubidium beam frequency standard

刘畅, 王延辉   

  1. School of Electronics engineering and Computer Science, Peking University, Beijing 100871, China
  • 收稿日期:2014-06-21 修回日期:2014-07-29 出版日期:2015-01-05 发布日期:2015-01-05
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 11174015).

Design and test of the microwave cavity in an optically-pumped Rubidium beam frequency standard

Liu Chang (刘畅), Wang Yan-Hui (王延辉)   

  1. School of Electronics engineering and Computer Science, Peking University, Beijing 100871, China
  • Received:2014-06-21 Revised:2014-07-29 Online:2015-01-05 Published:2015-01-05
  • Contact: Wang Yan-Hui E-mail:wangyanhui@pku.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 11174015).

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摘要： We are developing a compact rubidium atomic beam frequency standard with optical pumping and detection. The cavity for microwave interrogation is an important part of the clock. The cavity in our design is a Ramsey-type, E-bend one, which is the same as the conventional method in most cesium beam clocks. Requirements for the design are proposed based on the frequency shift associated with the cavity. The basic structure of the cavity is given by theoretical analysis and detailed dimensions are determined by means of electromagnetic field simulation with the help of commercial software. The cavity is manufactured and fabricated successfully. The preliminary test result of the cavity is given, which is in good agreement with the simulation. The resonant frequency is 6.835 GHz, equal to the clock transition frequency of 87Rb, and the loaded quality factor is 500. These values are adjustable with posts outside the cavity. Estimations on the Ramsey line width and several frequency shifts are made.

关键词: rubidium beam clock, optical pumping, microwave cavity, frequency shift

Abstract: We are developing a compact rubidium atomic beam frequency standard with optical pumping and detection. The cavity for microwave interrogation is an important part of the clock. The cavity in our design is a Ramsey-type, E-bend one, which is the same as the conventional method in most cesium beam clocks. Requirements for the design are proposed based on the frequency shift associated with the cavity. The basic structure of the cavity is given by theoretical analysis and detailed dimensions are determined by means of electromagnetic field simulation with the help of commercial software. The cavity is manufactured and fabricated successfully. The preliminary test result of the cavity is given, which is in good agreement with the simulation. The resonant frequency is 6.835 GHz, equal to the clock transition frequency of 87Rb, and the loaded quality factor is 500. These values are adjustable with posts outside the cavity. Estimations on the Ramsey line width and several frequency shifts are made.

Key words: rubidium beam clock, optical pumping, microwave cavity, frequency shift

中图分类号:  (Time and frequency)

  • 06.30.Ft
41.20.Jb (Electromagnetic wave propagation; radiowave propagation) 42.62.Eh (Metrological applications; optical frequency synthesizers for precision spectroscopy)