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
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/Hz1/2. 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.
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 62003020).
Corresponding Authors:
Xiujie Fang, Ying Liu
E-mail: fangxiujie@buaa.edu.cn;liu_ying@buaa.edu.cn
Cite this article:
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 2023 Chin. Phys. B 32 053201
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