波谱学杂志 ›› 2009, Vol. 26 ›› Issue (3): 369-374.

• 研究论文 • 上一篇    下一篇

铷原子频标鉴频信号信噪比相关问题分析

祁峰; 赵峰; 王芳; 康松柏; 梅刚华   

  1. 1.波谱与原子分子物理国家重点实验室(中国科学院 武汉物理与数学研究所),湖北 武汉 430071;2.中国科学院 研究生院,北京100080
  • 收稿日期:2009-04-16 修回日期:2009-05-12 出版日期:2009-09-05 发布日期:2010-01-04
  • 通讯作者: 梅刚华

Analyses on the Signal- to- Noise Ratio of the Atomic Discrimination Signal in Rubidium Atomic Frequency Standard

QI Feng; ZHAO Feng; WANF Fang; KANG Song-bai; MEI Gang-hua   

  1. 1.State Key Laboratory of Magnetic Resonance and Atomic Mdecular Physics
    (Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences), Wuhan 430071, China; 2.Graduate School of the Chinese Academy of Science, Beijing 100080, China
  • Received:2009-04-16 Revised:2009-05-12 Online:2009-09-05 Published:2010-01-04
  • Contact: MEI Gang-hua

摘要: 频率稳定度是铷原子频标最重要的性能指标. 铷频标频率稳定度主要由原子鉴频信号的信噪比决定. 本文分析了微波腔的结构、铷光谱灯的光谱纯度和同位素滤光方案对信噪比的影响,指出采用模式优越、微波填充因子大的微波腔,光谱纯度高的铷光谱灯,用分离滤光方法进行同位素滤光,可以提高铷原子鉴频信号的信噪比,从而使铷频标的稳定度指标得到进一步改善. 

关键词: 铷原子频标, 信噪比, 微波腔, 铷光谱灯, 同位素滤光

Abstract: Frequency stability is the most important parameter of a rubidium atomic frequency standard, which depends mainly on the signal-to-noise ratio (SNR) of the rubidium atomic discrimination signal (RADS). In this paper, we analyzed the effects of several factors on the SNR of the RADS, including the configuration of the microwave cavity, the spectrum purity of the rubidium spectrum lamp and the isotope filtering scheme. It was shown that the SNR of the RADS could be improved by using a microwave cavity with proper microwave field mode and high microwave filling factor, a rubidium spectrum lamp with high spectrum purity and a separated isotope filtering scheme in the physics package design. The performance of the rubidium atomic frequency standard could be improved by taking all these factors into consideration.

Key words: rubidium frequency standard, signal-to-noise ratio, microwave cavity, rubidium spectrum lamp, isotope filtering

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