| ATOMIC AND MOLECULAR PHYSICS |
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Preliminary Frequency Comparison of Two 40Ca+ Optical Frequency Standards |
| LIU Pei-Liang1,2,3, HUANG Yao1,2, BIAN Wu1,2,3, SHAO Hu1,2,3, QIAN Yuan1,2,3, GUAN Hua1,2, GAO Ke-Lin1,2** |
1State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071
2Key Laboratory of Atomic Frequency Standards, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071
3University of Chinese Academy of Sciences, Beijing 100049
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| Cite this article: |
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LIU Pei-Liang, HUANG Yao, BIAN Wu et al 2014 Chin. Phys. Lett. 31 113702 |
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Abstract Frequency comparison is one of the most efficient ways to evaluate the performance of a frequency standard. Based on the pre-existing 40Ca+ optical frequency standard, we set up the second 40Ca+ optical frequency standard, which has been improved in the materials and structure of ion traps for better control of the magnetic field. After the compensation, the residual magnetic field at the position of the ion is adjusted to be ～500 nT with a long time jitter of ～10 nT, which is better than the pre-existing 40Ca+ optical frequency standard. We realize the '4-point-closed-loop locking' on the second 40Ca+ optical frequency standard after a series of preparatory works. Through half an hour of measurement time, the two frequency standards exhibited a stability of 2.1×10?13τ?1/2 and a relative frequency difference of 1.5 (2.9) Hz.
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Published: 28 November 2014
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