Acta Physica Sinica, Volume. 68, Issue 23, 233401-1(2019)

Measurement of collision frequency shift in strontium optical lattice clock

Xiao-Tong Lu1,2, Ting Li1,2, De-Huan Kong1,2, Ye-Bing Wang1,2、*, and Hong Chang1,2、*
Author Affiliations
  • 1CAS Key Laboratory of Time and Frequency Primary Standards, National Time Service Center, Xi’an 710600, China
  • 2School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, China
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    Figures & Tables(5)
    Schematic diagram of the optical lattice and clock transition detection of strontium optical lattice clock. L1, lens; CR, concave mirror; GP1-2, Glan prism; MS, mechanical switch.锶原子光晶格钟光晶格和钟跃迁探测结构简图, 其中MS为机械开关; L1为透镜; GP1-2为格兰泰勒棱镜; CR为凹面镜
    Spectra of the 87Sr clock transition: (a) Sideband resolvable clock transition line measured in the experiment; (b) spin-polarized spectra of the clock transitions.87Sr原子钟跃迁谱线 (a)边带可分辨钟跃迁谱线; (b)钟跃迁自旋极化谱
    The method of self-comparison: (a) The spin-polarized peaks, fH and fL are the center frequency of locked clock transition, δvC is the value of collision frequency shift; (b) the feedback loop schematic, fH1 and fL1 are initial clock laser frequency of high-density and low-density respectively, and are the frequency of being corrected, Err1 and Err2 are error signals, Δf1 and Δf2 are revisionary frequency; (c) the time sequence; (d) the clock transition spectrum during alternately changing atomic density; (e) the excitation fraction at high and low atomic densities.自比对方法 (a)自旋极化峰, fH和fL分别对应高密度和低密度状态下钟跃迁的中心频率, δvC为碰撞频移的值; (b) 锁定反馈原理, fH1 和fL1是初始设定的激光频率, 和是修正激光频率, Err1和Err2是误差信号, Δf1和Δf2是频率修正量; (c) 时间序列; (d)交替改变原子密度获得的钟跃迁谱线; (e)高、低原子密度状态下原子的跃迁几率
    The Allan deviation obtained by the method of self-comparison between low and high atomic density.高低密度自比对艾伦偏差
    Measurement the collision frequency shift.碰撞频移测量结果
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    Xiao-Tong Lu, Ting Li, De-Huan Kong, Ye-Bing Wang, Hong Chang. Measurement of collision frequency shift in strontium optical lattice clock[J]. Acta Physica Sinica, 2019, 68(23): 233401-1

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    Paper Information

    Received: Jul. 26, 2019

    Accepted: --

    Published Online: Sep. 17, 2020

    The Author Email: Hong Chang (changhong@ntsc.ac.cn)

    DOI:10.7498/aps.68.20191147

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