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Chin. Phys. B, 2020, Vol. 29(7): 070602    DOI: 10.1088/1674-1056/ab9290
Special Issue: SPECIAL TOPIC — Ultracold atom and its application in precision measurement
SPECIAL TOPIC—Ultracold atom and its application in precision measurement Prev   Next  

A transportable optical lattice clock at the National Time Service Center

De-Huan Kong(孔德欢)1,2, Zhi-Hui Wang(王志辉)3, Feng Guo(郭峰)1,2, Qiang Zhang(张强)1,2, Xiao-Tong Lu(卢晓同)1,2, Ye-Bing Wang(王叶兵)1, Hong Chang(常宏)1,2
1 CAS Key Laboratory of Time and Frequency Primary Standards, National Time Service Center, Xi'an 710600, China;
2 School of Astronomy and Space Science, University of Chinese Academy of Sciences(CAS), Beijing 100049, China;
3 State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, China
Abstract  We report a transportable one-dimensional optical lattice clock based on 87Sr at the National Time Service Center. The transportable apparatus consists of a compact vacuum system and compact optical subsystems. The vacuum system with a size of 90 cm×20 cm×42 cm and the beam distributors are assembled on a double-layer optical breadboard. The modularized optical subsystems are integrated on independent optical breadboards. By using a 230 ms clock laser pulse, spin-polarized spectroscopy with a linewidth of 4.8 Hz is obtained which is close to the 3.9 Hz Fourier-limit linewidth. The time interleaved self-comparison frequency instability is determined to be 6.3×10-17 at an averaging time of 2000 s.
Keywords:  optical lattice clock      strontium atoms      spin-polarized spectra      instability  
Received:  20 February 2020      Revised:  30 April 2020      Published:  05 July 2020
PACS:  06.30.Ft (Time and frequency)  
  32.70.Jz (Line shapes, widths, and shifts)  
  37.10.Jk (Atoms in optical lattices)  
  42.62.Eh (Metrological applications; optical frequency synthesizers for precision spectroscopy)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61775220 and 11803042), the Key Research Project of Frontier Science of the Chinese Academy of Sciences (Grant No. QYZDB-SSW-JSC004), and the strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB21030100).
Corresponding Authors:  Hong Chang     E-mail:  changhong@ntsc.ac.cn

Cite this article: 

De-Huan Kong(孔德欢), Zhi-Hui Wang(王志辉), Feng Guo(郭峰), Qiang Zhang(张强), Xiao-Tong Lu(卢晓同), Ye-Bing Wang(王叶兵), Hong Chang(常宏) A transportable optical lattice clock at the National Time Service Center 2020 Chin. Phys. B 29 070602

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