Chinese Optics Letters, Volume. 19, Issue 12, 120201(2021)
Uncertainty evaluation of the second-order Zeeman shift of a transportable 87Rb atomic fountain clock
Fig. 1. (a) Schematic diagram of the experimental installation of the Rb fountain. There are five layers of magnetic shields to suppress the environmental magnetic field. The entire setup functions in a temperature-controlled cabinet. (b) C-field and eight sets of compensation coils. Solenoid coils and other auxiliary compensation coils construct the uniform magnetic field of the Ramsey interrogation zone and free flight zone. It has an average magnetic field of approximately 50 nT.
Fig. 2. Graphical representation of two magneto-sensitive transitions from the cooling zone at 3.19 and 3.24 m/s. Average magnetic field change of approximately 0.4 nT for a central fringe shift of approximately 5.5 Hz for the two magneto-sensitive transition fringes.
Fig. 3. Ramsey fringes for ejection velocities of 3.94, 3.97, and 4.00 m/s. The embedded image is an enlargement of Ramsey’s central fringe. From the embedded diagram, the Ramsey central fringe shifts by approximately 0.8 Hz, which corresponds to an average magnetic field fluctuation of 0.05 nT.
Fig. 4. Time-averaged magnetic field map. Measured position of the (
Fig. 5. Monitoring the central Ramsey fringe of the |F = 2, mF = −1→|F = 1, mF = −1〉 transition for nearly 2 days. The temporal variation did not exceed ±0.85 Hz, which corresponds to a magnetic field variation of 0.06 nT.
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Henan Cheng, Siminda Deng, Zhen Zhang, Jingfeng Xiang, Jingwei Ji, Wei Ren, Tang Li, Qiuzhi Qu, Liang Liu, Desheng Lü. Uncertainty evaluation of the second-order Zeeman shift of a transportable 87Rb atomic fountain clock[J]. Chinese Optics Letters, 2021, 19(12): 120201
Category: Atomic and Molecular Optics
Received: Mar. 24, 2021
Accepted: May. 14, 2021
Published Online: Sep. 2, 2021
The Author Email: Liang Liu (liang.liu@siom.ac.cn), Desheng Lü (dslv@siom.ac.cn)