A miniaturized spin-exchange relaxation-free atomic magnetometer based on uniform light field

doi:10.1088/1674-1056/aca7f2

中国物理B ›› 2023, Vol. 32 ›› Issue (5): 53201-053201.doi: 10.1088/1674-1056/aca7f2

A miniaturized spin-exchange relaxation-free atomic magnetometer based on uniform light field

Jiajie Li(李佳洁)^1,2, Xiujie Fang(房秀杰)^2,3,†, Renjie Li(李任杰)^1,2, Baodong Chen(陈宝栋)^1,2, Yueyang Zhai(翟跃阳)^1,2, and Ying Liu(刘颖)^1,2,‡

1 Key Laboratory of Ultra-Weak Magnetic Field Measurement Technology(Ministry of Education), School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing 100191, China;
2 Zhejiang Provincial Key Laboratory of Ultra-Weak Magnetic-Field Space and Applied Technology, Hangzhou Innovation Institute, Beihang University, Hangzhou 310051, China;
3 School of Physics, Beihang University, Beijing 100191, China

收稿日期:2022-10-31 修回日期:2022-11-21 接受日期:2022-12-02 出版日期:2023-04-21 发布日期:2023-05-05
通讯作者: Xiujie Fang, Ying Liu E-mail:fangxiujie@buaa.edu.cn;liu_ying@buaa.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 62003020).

A miniaturized spin-exchange relaxation-free atomic magnetometer based on uniform light field

Jiajie Li(李佳洁)^1,2, Xiujie Fang(房秀杰)^2,3,†, Renjie Li(李任杰)^1,2, Baodong Chen(陈宝栋)^1,2, Yueyang Zhai(翟跃阳)^1,2, and Ying Liu(刘颖)^1,2,‡

1 Key Laboratory of Ultra-Weak Magnetic Field Measurement Technology(Ministry of Education), School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing 100191, China;
2 Zhejiang Provincial Key Laboratory of Ultra-Weak Magnetic-Field Space and Applied Technology, Hangzhou Innovation Institute, Beihang University, Hangzhou 310051, China;
3 School of Physics, Beihang University, Beijing 100191, China

Received:2022-10-31 Revised:2022-11-21 Accepted:2022-12-02 Online:2023-04-21 Published:2023-05-05
Contact: Xiujie Fang, Ying Liu E-mail:fangxiujie@buaa.edu.cn;liu_ying@buaa.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 62003020).

摘要/Abstract

摘要： We experimentally study the dynamic characteristics of a miniaturized spin-exchange relaxation-free (SERF) magnetometer based on uniform light field. The ceramic ferrule is used to expand the Gaussian beam to improve light intensity uniformity, while the volume of the sensor is also reduced. This scheme makes the magnetometer have better sensitivity when the detected light intensity is less than 3.16 mW/cm² at 120 ℃. When the temperature rises to 150 ℃ the sensitivity under the action of uniform light field is 18.5 fT/Hz^1/2. The bandwidth of the sensor remains at the original level and meets application needs. The proposed structure improves transverse polarization uniformity within the miniaturized sensor, which is ideal for the magnetoencephalography and magnetocardiography imaging systems.

关键词: atomic magnetometer, uniform light field, polarization, sensitivity

Abstract: We experimentally study the dynamic characteristics of a miniaturized spin-exchange relaxation-free (SERF) magnetometer based on uniform light field. The ceramic ferrule is used to expand the Gaussian beam to improve light intensity uniformity, while the volume of the sensor is also reduced. This scheme makes the magnetometer have better sensitivity when the detected light intensity is less than 3.16 mW/cm² at 120 ℃. When the temperature rises to 150 ℃ the sensitivity under the action of uniform light field is 18.5 fT/Hz^1/2. The bandwidth of the sensor remains at the original level and meets application needs. The proposed structure improves transverse polarization uniformity within the miniaturized sensor, which is ideal for the magnetoencephalography and magnetocardiography imaging systems.

Key words: atomic magnetometer, uniform light field, polarization, sensitivity

中图分类号: (Electric and magnetic moments, polarizabilities)

32.10.Dk

32.80.Qk (Coherent control of atomic interactions with photons) 33.35.+r (Electron resonance and relaxation) 07.07.Mp (Transducers)

Jiajie Li(李佳洁), Xiujie Fang(房秀杰), Renjie Li(李任杰), Baodong Chen(陈宝栋), Yueyang Zhai(翟跃阳), and Ying Liu(刘颖). A miniaturized spin-exchange relaxation-free atomic magnetometer based on uniform light field[J]. 中国物理B, 2023, 32(5): 53201-053201.

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A miniaturized spin-exchange relaxation-free atomic magnetometer based on uniform light field

A miniaturized spin-exchange relaxation-free atomic magnetometer based on uniform light field

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