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Journals >Optical Instruments >Volume 44 >Issue 1 >Page 55 > Article

Optical Instruments
Vol. 44, Issue 1, 55 (2022)

Design and thermal field analysis of a single beam miniaturized all-optical atomic magnetometer

Yu WANG, Weiyu ZHAO, Yang LI^*, Jun LI, and Xiumin GAO

Author Affiliations

School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China

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DOI: 10.3969/j.issn.1005-5630.2022.01.009 Cite this Article

Yu WANG, Weiyu ZHAO, Yang LI, Jun LI, Xiumin GAO. Design and thermal field analysis of a single beam miniaturized all-optical atomic magnetometer[J]. Optical Instruments, 2022, 44(1): 55 Copy Citation Text

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Abstract

Spin-exchange relaxation free（SERF）atomic magnetometer is a kind of ultra-sensitive magnetometer, and its miniaturization is very important for the application of magnetometer. The layout of optical path is the key factor that restricts its size and sensitivity. In this paper, a single beam miniaturized atomic magnetometer is designed. The magnetometer is a cylinder with a diameter of 21.2 mm and a height of 40.5 mm. Thermal simulation experiments are carried out on the magnetometer. The experimental results show that the design is reasonable in structure and easy for multi-channel measurement, and has practical application value in the field of biological magnetic field measurement such as magnetoencephalography and magnetocardiogram.

Keywords

optical atomic magnetometer single-beam spin-exchange relaxation free weak magnetic measurement

$ \omega = \gamma \left\| B \right\| $

(1)

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$ \frac{{\rm{d}}}{{{\rm{d}}t}}S = \frac{1}{q}\left[ {{\gamma ^{\rm{e}}}{\boldsymbol{B}} \times S + {R_{\rm{p}}}\left( {\frac{1}{2}{\boldsymbol{sz}} - S} \right) - {R_{{\rm{rel}}}}S} \right] $

(2)

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$ \delta B = \frac{1}{{\gamma \sqrt {n{T_2}V{t_1}} }} $

(3)

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$ n = \frac{1}{T}{10^{{21.866 + \alpha - \beta/}{T}}} $

(4)

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$ {{\boldsymbol{E}}_0} = {\boldsymbol{A}}\cos(kX + \omega t + \varphi ) $

(5)

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$ {{\boldsymbol{G}}}_{{\text{起}}}=\left(

\begin{array}{ll} 1 & 0 \\ 0 & 0 \end{array}

\right) $

(6)

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$ {\boldsymbol{G}}_{\frac{\lambda }{4}} = \frac{1}{{\sqrt 2 }}\left( {

\begin{array}{r} 1 & - i \\ - i & 1 \end{array}

} \right) $

(7)

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$ {P_{\rm{z}}} = \frac{{{R_{{\rm{pl}}}}}}{{{R_{{\rm{rel}}}} + {R_{{\rm{pl}}}}}} $

(8)

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$ {{\boldsymbol{G}}_{\frac{\lambda }{8}}} = \cos \dfrac{ {\text{π}} }{8}\left( {

\begin{array}{r} 1 & - i \tan \frac{π}{8} \\ - i \tan \frac{π}{8} & 1 \end{array}

} \right) $

(9)

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$ {{\boldsymbol{G}}_{{\rm{cell}}}} = \left( {

\begin{matrix} \cos θ & - \sin θ \\ \sin θ & \cos θ \end{matrix}

} \right) $

(10)

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$ \theta = - \frac{1}{2}nc{r_{\rm{e}}}l{f_{{D_1}}}{D_1}(\delta v){P_{\rm{z}}} $

(11)

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$ {{\boldsymbol{G}}}_{{\text{检}}}=\left(

\begin{array}{ll} 1 & 0 \\ 0 & 0 \end{array}

\right) $

(12)

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$ {{\boldsymbol{G}}_{1{\text{ }}}} = \left( {

\begin{array}{l} 1 / 2 & 1 / 2 \\ 1 / 2 & 1 / 2 \end{array}

} \right) $

(13)

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$ {{\boldsymbol{G}}_{2{\text{ }}}} = \left( {

\begin{array}{l} 1 / 2 & - 1 / 2 \\ - 1 / 2 & 1 / 2 \end{array}

} \right) $

(14)

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$ {{\boldsymbol{E}}}_{{\rm{out}}}{}_{1}={{\boldsymbol{G}}}_{1}\cdot {{\boldsymbol{G}}}_{{\text{检}}}\cdot {{\boldsymbol{G}}}_{{\rm{NPBS}}}\cdot {{\boldsymbol{G}}}_{{\rm{cell}}}\cdot {{\boldsymbol{G}}}_{\frac{\lambda }{8}}\cdot {{\boldsymbol{G}}}_{\frac{\lambda }{8}}\cdot {{\boldsymbol{G}}}_{{\rm{NPBS}}}\cdot {{\boldsymbol{G}}}_{\frac{\lambda }{4}}\cdot {{\boldsymbol{G}}}_{{\text{起}}}\cdot {{\boldsymbol{E}}}_{0} $

(15)

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$ {{\boldsymbol{E}}}_{{\rm{out}}}{}_{2}={{\boldsymbol{G}}}_{2}\cdot {{\boldsymbol{G}}}_{{\text{检}}}\cdot {{\boldsymbol{G}}}_{{\rm{NPBS}}}\cdot {{\boldsymbol{G}}}_{{\rm{cell}}}\cdot {{\boldsymbol{G}}}_{\frac{\lambda }{8}}\cdot {{\boldsymbol{G}}}_{\frac{\lambda }{8}}\cdot {{\boldsymbol{G}}}_{{\rm{NPBS}}}\cdot {{\boldsymbol{G}}}_{\frac{\lambda }{4}}\cdot {{\boldsymbol{G}}}_{{\text{起}}}\cdot {{\boldsymbol{E}}}_{0} $

(16)

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$ I = {I_1} - {I_2} = C \cdot \sin \theta \cdot {I_0} \approx C \cdot \theta \cdot {I_0} $

(17)

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Yu WANG, Weiyu ZHAO, Yang LI, Jun LI, Xiumin GAO. Design and thermal field analysis of a single beam miniaturized all-optical atomic magnetometer[J]. Optical Instruments, 2022, 44(1): 55

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