Recent Advances Concerning the 87Sr Optical Lattice Clock at the National Time Service Center

Applied Sciences

Yebing Wang¹  Xiaotong Lu¹  Dehuan Kong¹  Hong Chang¹  Benquan Lu¹ 

[1] Key Laboratory of Time and Frequency Primary Standards, National Time Service Center, Chinese Academy of Sciences, Xi’an 710600, China;

关键词: optical clocks;    strontium atoms;    optical lattices;    laser cooling and trapping;    stability;    uncertainty;   

DOI  :  10.3390/app8112194

来源: DOAJ

【 摘 要 】

We review recent experimental progress concerning the ⁸⁷Sr optical lattice clock at the National Time Service Center in China. Hertz-level spectroscopy of the ⁸⁷Sr clock transition for the optical lattice clock was performed, and closed-loop operation of the optical lattice clock was realized. A fractional frequency instability of 2.8 × 10⁻¹⁷ was attained for an averaging time of 2000 s. The Allan deviation is found to be 1.6 × 10⁻¹⁵/τ^1/2 and is limited mainly by white-frequency-noise. The Landé g-factors of the (5s²)¹S₀ and (5s5p)³P₀ states in ⁸⁷Sr were measured experimentally; they are important for evaluating the clock’s Zeeman shifts. We also present recent work on the miniaturization of the strontium optical lattice clock for space applications.

【 授权许可】

Unknown