• Laser & Optoelectronics Progress
  • Vol. 60, Issue 11, 1106003 (2023)
Guodong Zhao1、2, Xiaotong Lu1、*, and Hong Chang1、2、**
Author Affiliations
  • 1Key Laboratory of Time and Frequency Primary Standards, National Time Service Center, Chinese Academy of Sciences, Xi'an 710600, Shaanxi, China
  • 2School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049 China
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    DOI: 10.3788/LOP223237 Cite this Article Set citation alerts
    Guodong Zhao, Xiaotong Lu, Hong Chang. Research Progress of the Optical Frequency Standard[J]. Laser & Optoelectronics Progress, 2023, 60(11): 1106003 Copy Citation Text show less

    Abstract

    Optical clocks have developed rapidly in the past 20 years, and their stability and systematic uncertainty are two orders of magnitude better than the current best microwave atomic clocks, and currently, there are 10 optical transitions which have been selected as the secondary representations of the definition of the second by the International Bureau of Metrology and participate in the generation of the international atomic time. This paper introduces the operational principle and evaluations of the performance of optical clocks, the latest research progress of ionic optical clocks and optical lattice clocks, elaborates the progress of the absolute frequency measurement of optical clocks, and summarizes the measurement results of the secondary representations of the definition of the second by optical frequency transitions.
    σDick(τ)=1τ1|g0|2k=1Sy(k/T)|gk|2  ,
    σDick(τ)=σclock2ln2Tτk=11k|gk|2|g0|2  ,
    σDet(τ)=12K0f0TCτ1N+1γN+δN2  ,
    ufUTC(k)fTAI-1=2×uLink86400×55Ttotal0.9,
    Guodong Zhao, Xiaotong Lu, Hong Chang. Research Progress of the Optical Frequency Standard[J]. Laser & Optoelectronics Progress, 2023, 60(11): 1106003
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