中国物理B ›› 2015, Vol. 24 ›› Issue (5): 54213-054213.doi: 10.1088/1674-1056/24/5/054213

所属专题: TOPICAL REVIEW — Precision measurement and cold matters

• TOPICAL REVIEW—Precision measurement and cold matters • 上一篇    下一篇

Precision spectroscopy with a single 40Ca+ ion in a Paul trap

管桦a b, 黄垚a b, 刘培亮a b, 边武a b c, 邵虎a b c, 高克林a b   

  1. a State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China;
    b Key Laboratory of Atomic Frequency Standards, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China;
    c University of Chinese Academy of Sciences, Beijing 100080, China
  • 收稿日期:2015-02-09 修回日期:2015-03-23 出版日期:2015-05-05 发布日期:2015-05-05
  • 基金资助:
    Project supported by the National Basic Research Program of China (Grant Nos. 2012CB821301 and 2005CB724502), the National Natural Science Foundation of China (Grant Nos. 11474318, 91336211, and 11034009), and Chinese Academy of Sciences.

Precision spectroscopy with a single 40Ca+ ion in a Paul trap

Guan Hua (管桦)a b, Huang Yao (黄垚)a b, Liu Pei-Liang (刘培亮)a b, Bian Wu (边武)a b c, Shao Hu (邵虎)a b c, Gao Ke-Lin (高克林)a b   

  1. a State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China;
    b Key Laboratory of Atomic Frequency Standards, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China;
    c University of Chinese Academy of Sciences, Beijing 100080, China
  • Received:2015-02-09 Revised:2015-03-23 Online:2015-05-05 Published:2015-05-05
  • Contact: Gao Ke-Lin E-mail:klgao@wipm.ac.cn
  • About author:42.62.Fi; 37.10.Ty; 43.58.Hp
  • Supported by:
    Project supported by the National Basic Research Program of China (Grant Nos. 2012CB821301 and 2005CB724502), the National Natural Science Foundation of China (Grant Nos. 11474318, 91336211, and 11034009), and Chinese Academy of Sciences.

摘要: Precision measurement of the 4s 2S1/2–3d 2D5/2 clock transition based on 40Ca+ ion at 729 nm is reported. A single 40Ca+ ion is trapped and laser-cooled in a ring Paul trap, and the storage time for the ion is more than one month. The linewidth of a 729 nm laser is reduced to about 1 Hz by locking to a super cavity for longer than one month uninterruptedly. The overall systematic uncertainty of the clock transition is evaluated to be better than 6.5× 10-16. The absolute frequency of the clock transition is measured at the 10-15 level by using an optical frequency comb referenced to a hydrogen maser which is calibrated to the SI second through the global positioning system (GPS). The frequency value is 411 042 129 776 393.0(1.6) Hz with the correction of the systematic shifts. In order to carry out the comparison of two 40Ca+ optical frequency standards, another similar 40Ca+ optical frequency standard is constructed. Two optical frequency standards exhibit stabilities of 1× 10-14τ-1/2 with 3 days of averaging. Moreover, two additional precision measurements based on the single trapped 40Ca+ ion are carried out. One is the 3d 2D5/2 state lifetime measurement, and our result of 1174(10) ms agrees well with the results reported in [Phys. Rev. A 62 032503 (2000)] and [Phys. Rev. A 71 032504 (2005)]. The other one is magic wavelengths for the 4s 2S1/2–3d 2D5/2 clock transition; λ|mj|= 1/2= 395.7992(7) nm and λ|mj|= 3/2= 395.7990(7) nm are reported, and it is the first time that two magic wavelengths for the 40Ca+ clock-transition have been reported.

关键词: optical frequency standard, precision spectroscopy, Ca+ ion, lifetime measurement, magic wavelength

Abstract: Precision measurement of the 4s 2S1/2–3d 2D5/2 clock transition based on 40Ca+ ion at 729 nm is reported. A single 40Ca+ ion is trapped and laser-cooled in a ring Paul trap, and the storage time for the ion is more than one month. The linewidth of a 729 nm laser is reduced to about 1 Hz by locking to a super cavity for longer than one month uninterruptedly. The overall systematic uncertainty of the clock transition is evaluated to be better than 6.5× 10-16. The absolute frequency of the clock transition is measured at the 10-15 level by using an optical frequency comb referenced to a hydrogen maser which is calibrated to the SI second through the global positioning system (GPS). The frequency value is 411 042 129 776 393.0(1.6) Hz with the correction of the systematic shifts. In order to carry out the comparison of two 40Ca+ optical frequency standards, another similar 40Ca+ optical frequency standard is constructed. Two optical frequency standards exhibit stabilities of 1× 10-14τ-1/2 with 3 days of averaging. Moreover, two additional precision measurements based on the single trapped 40Ca+ ion are carried out. One is the 3d 2D5/2 state lifetime measurement, and our result of 1174(10) ms agrees well with the results reported in [Phys. Rev. A 62 032503 (2000)] and [Phys. Rev. A 71 032504 (2005)]. The other one is magic wavelengths for the 4s 2S1/2–3d 2D5/2 clock transition; λ|mj|= 1/2= 395.7992(7) nm and λ|mj|= 3/2= 395.7990(7) nm are reported, and it is the first time that two magic wavelengths for the 40Ca+ clock-transition have been reported.

Key words: optical frequency standard, precision spectroscopy, Ca+ ion, lifetime measurement, magic wavelength

中图分类号:  (Laser spectroscopy)

  • 42.62.Fi
37.10.Ty (Ion trapping) 43.58.Hp (Tuning forks, frequency standards; frequency measuring and recording instruments; time standards and chronographs)