Zero field optically pumped magnetometer with independent dual-mode operation

Shaowen Zhang; Jixi Lu; Ying Zhou; Fei Lu; Kaifeng Yin; Di Zhan; Yueyang Zhai; Mao Ye

doi:10.3788/COL202220.081202

Journals >Chinese Optics Letters >Volume 20 >Issue 8 >Page 081202 > Article

Chinese Optics Letters
Vol. 20, Issue 8, 081202 (2022)

Zero field optically pumped magnetometer with independent dual-mode operation

Shaowen Zhang^1、2、3, Jixi Lu^2、4、*, Ying Zhou^2、**, Fei Lu¹, Kaifeng Yin¹, Di Zhan¹, Yueyang Zhai^2、4, and Mao Ye^2、4

Author Affiliations

¹School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing 100191, China

²Hangzhou Innovation Institute of Beihang University, Hangzhou 310051, China

³Beihang Hangzhou Innovation Institute Yuhang, Hangzhou 310023, China

⁴Research Institute for Frontier Science, Beihang University, Beijing 100191, China

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DOI: 10.3788/COL202220.081202 Cite this Article Set citation alerts

Shaowen Zhang, Jixi Lu, Ying Zhou, Fei Lu, Kaifeng Yin, Di Zhan, Yueyang Zhai, Mao Ye. Zero field optically pumped magnetometer with independent dual-mode operation[J]. Chinese Optics Letters, 2022, 20(8): 081202 Copy Citation Text

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Abstract

We propose a dual-mode optically pumped magnetometer (OPM) that can flexibly switch between single-beam modulation mode and double-beam DC mode. Based on a

4 mm \times 4 mm \times 4 mm

miniaturized vapor cell, the double-beam DC mode achieves a sensitivity of

7 fT / {Hz}^{1 / 2}

with probe noise below

4 fT / {Hz}^{1 / 2}

and working bandwidth over 65 Hz. This mode is designed to precisely measure the noise floor of a mu-metal magnetic shield. The single-beam modulation mode (sensitivity

20 fT / {Hz}^{1 / 2}

) exhibits bandwidth characteristics suitable for biomagnetic measurements. Thus, our design is suitable for a miniaturized OPM with multiple functions, including magnetic-shield background noise measurement and medical imaging.

Keywords

atomic optics dual-mode magnetometer magnetoencephalography medical imaging optically pumped magnetometer

\frac{\partial P}{\partial t} = \frac{1}{q} [γ^{e} B \times P + R_{O P} (s \hat{z} - P) - R_{rel} P],

(1)