Chinese Journal of Magnetic Resonance ›› 2017, Vol. 34 ›› Issue (2): 200-205.doi: 10.11938/cjmr20170209

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Magnetic Frequency Shift in Rubidium Atomic Frequency Standards

NIE Shuai1,2, WANG Peng-fei1, MEI Gang-hua1, ZHONG Da1   

  1. 1. Key Laboratory of Atom Frequency Standard of the Chinese Academy of Sciences(Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences), Wuhan 430071, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2016-04-05 Revised:2017-04-17 Online:2017-06-05 Published:2017-06-05

Abstract: Long-term stability is a key specification for rubidium atomic frequency standards (RAFS), which is influenced by magnetic frequency shift caused by C-field stability. Taking advantage of the linear relationship between the transition frequency of 87Rb ground state and external magnetic field, we measured the C-field intensity inside the physical package of RAFS, as well as the magnetic shielding factor of the magnetic shield case. Experimental results indicated that C-field fluctuation inside the physical package could be attenuated by using the magnetic shield case. The axial magnetic shield factor was measured to be about 3 828, which could shield geomagnetic field efficiently and keep the magnetic frequency shift in a proper range.

Key words: rubidium atomic frequency standards (RAFS), energy level transition, magnetic shielding factor, frequency stability

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