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Appl. Sci. 2018, 8(11), 2194; https://doi.org/10.3390/app8112194

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

1
Key Laboratory of Time and Frequency Primary Standards, National Time Service Center, Chinese Academy of Sciences, Xi’an 710600, China
2
School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, China
*
Author to whom correspondence should be addressed.
Received: 27 September 2018 / Revised: 5 November 2018 / Accepted: 5 November 2018 / Published: 8 November 2018
(This article belongs to the Special Issue Quantum Optics and Quantum Information Processing 2018)
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Abstract

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 × 10−151/2 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. View Full-Text
Keywords: optical clocks; strontium atoms; optical lattices; laser cooling and trapping; stability; uncertainty optical clocks; strontium atoms; optical lattices; laser cooling and trapping; stability; uncertainty
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Wang, Y.; Lu, X.; Lu, B.; Kong, D.; Chang, H. Recent Advances Concerning the 87Sr Optical Lattice Clock at the National Time Service Center. Appl. Sci. 2018, 8, 2194.

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