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Atomic magnetometer with microfabricated vapor cells based on coherent population trapping |
| Xiaojie Li(李晓杰)1,2,3, Yue Shi(史越)1,2,3, Hongbo Xue(薛洪波)4, Yong Ruan(阮勇)1,2,3,5,†, and Yanying Feng(冯焱颖)1,2,3,‡ |
| 1 State Key Laboratory of Precision Measurement Technology and Instrument, Tsinghua University, Beijing 100084, China; 2 Key Laboratory of Photonic Control Technology (Ministry of Education), Tsinghua University, Beijing 100084, China; 3 Department of Precision Instrument, Tsinghua University, Beijing 100084, China; 4 State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China; 5 MEMS Institute of Zibo National High-tech Industrial Development Zone, Zibo 255086, China |
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Abstract An atomic magnetometer based on coherent population trapping (CPT) resonances in microfabricated vapor cells is demonstrated. Fabricated by the micro-electro-mechanical-system (MEMS) technology, the cells are filled with Rb and Ne at a controlled pressure. An experimental apparatus is built for characterizing properties of microfabricated vapor cells via the CPT effects. The typical CPT linewidth is measured to be about 3 kHz (1.46 kHz with approximately zero laser intensity) for the rubidium D1 line at about 90 °C. The effects of pressure, temperature and laser intensity on CPT linewidth are studied experimentally. A closed-loop atomic magnetometer is finally finished with a sensitivity of 210.5 pT/Hz1/2 at 1 Hz bandwidth. This work paves the way for developing an integrated chip-scale atomic magnetometer in the future.
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Received: 19 August 2020
Revised: 30 September 2020
Accepted manuscript online: 20 October 2020
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PACS:
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07.55.Ge
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(Magnetometers for magnetic field measurements)
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85.85.+j
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(Micro- and nano-electromechanical systems (MEMS/NEMS) and devices)
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76.70.Hb
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(Optically detected magnetic resonance (ODMR))
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42.50.Gy
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(Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61473166). |
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Corresponding Authors:
†Corresponding author. E-mail: ruanyong@tsinghua.edu.cn ‡Corresponding author. E-mail: yyfeng@tsinghua.edu.cn
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Cite this article:
Xiaojie Li(李晓杰), Yue Shi(史越), Hongbo Xue(薛洪波), Yong Ruan(阮勇), and Yanying Feng(冯焱颖) Atomic magnetometer with microfabricated vapor cells based on coherent population trapping 2021 Chin. Phys. B 30 030701
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