Dynamics of a Spin-Exchange Relaxation-Free Comagnetometer for Rotation Sensing

Liu, Jiali; Jiang, Liwei; Liang, Yixiang; Li, Guanghui; Cai, Zhongyu; Wu, Zhihong; Quan, Wei

doi:10.1103/physrevapplied.17.014030

Cited by 25 publications

(3 citation statements)

References 30 publications

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“…[22] A left-handed circularly polarized pump laser with a center frequency of D1 transition of K atoms was incident into the cell for polarizing K and Rb atoms, and the noble gas 21 Ne would be further hyperpolarized by spin exchange interact in several hours. [23,24] The transverse alkali metal polarization P e x is characterized by the optical spin angle 𝜃 of the off-resonant linearly polarized probe laser, which was detected by the balanced polarimeter. [25] The final output signal is represented as:…”

Section: Methodsmentioning

confidence: 99%

“…[ 22 ] A left‐handed circularly polarized pump laser with a center frequency of D1 transition of K atoms was incident into the cell for polarizing K and Rb atoms, and the noble gas

^{21}\mathrm{Ne}

would be further hyperpolarized by spin exchange interact in several hours. [ 23,24 ] The transverse alkali metal polarization

P_x^e

is characterized by the optical spin angle

\theta

of the off‐resonant linearly polarized probe laser, which was detected by the balanced polarimeter. [ 25 ] The final output signal is represented as:

\begin{align} S_x=\mathcal {K}P_x^e+b \end{align}

where

\mathcal {K}

is a parameter related to the intensity and frequency of the probe laser, Rb atomic density, etc., and

b

is the bias voltage.…”

Section: Methodsmentioning

confidence: 99%

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Effects of Stochastic Magnetic Noise on the SERF Co‐Magnetometer

Li,

Wang,

Fan

et al. 2024

Adv Quantum Tech

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Stochastic magnetic field noise has a non‐negligible negative impact on the performance of quantum precision measurement instruments such as spin‐exchange relaxation‐free (SERF) co‐magnetometer in terms of sensitivity and stability. Conventional magnetic field error analysis and suppression methods are not applicable to stochastic magnetic field noise. In this paper, a stochastic model of the SERF co‐magnetometer is proposed to analyze the mechanism of stochastic magnetic field noise. The mean and covariance propagation model of the SERF co‐magnetometer is given based on the stochasticity model and statistical principles. The analysis of simulation experiments reveals that reducing the longitudinal electron spin polarization can somewhat reduce the standard deviation of the system output caused by stochastic magnetic field noise. And the atomic ensembles are most resistant to stochastic magnetic field noise when the electron spin polarization strongly couples with the nuclear spin polarization. Finally, the experiments verified the above conclusions. In conclusion, this paper provides theoretical and experimental support for analyzing and suppressing the effect of stochastic magnetic field noise on the SERF co‐magnetometer, which is of great significance for improving the sensitivity and stability of the measurement.

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Section: Methodsmentioning

confidence: 99%

“…[ 22 ] A left‐handed circularly polarized pump laser with a center frequency of D1 transition of K atoms was incident into the cell for polarizing K and Rb atoms, and the noble gas

^{21}\mathrm{Ne}

would be further hyperpolarized by spin exchange interact in several hours. [ 23,24 ] The transverse alkali metal polarization

P_x^e

is characterized by the optical spin angle

\theta

of the off‐resonant linearly polarized probe laser, which was detected by the balanced polarimeter. [ 25 ] The final output signal is represented as:

\begin{align} S_x=\mathcal {K}P_x^e+b \end{align}

where

\mathcal {K}

is a parameter related to the intensity and frequency of the probe laser, Rb atomic density, etc., and

b

is the bias voltage.…”

Section: Methodsmentioning

confidence: 99%

Effects of Stochastic Magnetic Noise on the SERF Co‐Magnetometer

Li,

Wang,

Fan

et al. 2024

Adv Quantum Tech

Self Cite

View full text Add to dashboard Cite

show abstract

“…Their high sensitivity to rotation holds promise as a rotation sensor in next-generation inertial navigation systems [7,8]. High shield factor and low noise in the magnetic shield system is necessary to ensure the normal operation of SERF co-magnetometers [9,10]; however, the inherent noise of the material comprising the magnetic shield system is the main noise term restricting their sensitivity and accuracy [11,12].…”

Section: Introductionmentioning

confidence: 99%

Study on the Magnetic Noise Characteristics of Amorphous and Nanocrystalline Inner Magnetic Shield Layers of SERF Co-Magnetometer

Liu

Gao

et al. 2022

Materials

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With the widespread use of magneto-sensitive elements, magnetic shields are an important part of electronic equipment, ultra-sensitive atomic sensors, and in basic physics experiments. Particularly in Spin-exchange relaxation-free (SERF) co-magnetometers, the magnetic shield is an important component for maintaining the SERF state. However, the inherent noise of magnetic shield materials is an important factor limiting the measurement sensitivity and accuracy of SERF co-magnetometers. In this paper, both amorphous and nanocrystalline materials were designed and applied as the innermost magnetic shield of an SERF co-magnetometer. Magnetic noise characteristics of different amorphous and nanocrystalline materials used as the internal magnetic shielding layer of the magnetic shielding system were analyzed. In addition, the effects on magnetic noise due to adding aluminum to amorphous and nanocrystalline materials were studied. The experimental results show that compared with an amorphous material, a nanocrystalline material as the inner magnetic shield layer can effectively reduce the magnetic noise and improve the sensitivity and precision of the rotation measurement. Nanocrystalline material is very promising for inner shield composition in SERF co-magnetometers. Furthermore, its ultra-thin structure and low cost have significant application value in the miniaturization of SERF co-magnetometers.

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In Situ Measurement of the Non‐Orthogonal Angles of Magnetic Field Coils Based on Single‐Beam Magnetic Resonance

Liu,

Dong,

et al. 2024

Adv Quantum Tech

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This work proposes a novel method for in situ measurement of the non‐orthogonal angles of magnetic field coils based on single‐beam magnetic resonance. The orthogonality of magnetic field coils is crucial for ensuring the accuracy of atomic magnetometers. The theoretical principles are derived to establish a measurement method for the non‐orthogonal angles. The proposed method requires only one single beam of light to perform in situ measurements of non‐orthogonal angles in the YZ and XZ directions. The experimental results demonstrate that the angle between the Y and Z coils is 89.3001 ± 0.0045°, a value that remains stable despite variations in experimental parameters such as temperature and light power, thereby confirming the robustness of the method. Additionally, the measured gyromagnetic ratio is 6.9963 ± 0.0005 Hz nT−1, which closely matches the theoretical value of 6.9958 Hz nT−1, further validating the method's accuracy. The proposed method provides a more straightforward approach and has significant potential for widespread application across various atomic magnetometers, especially in miniaturized configurations. Furthermore, this method may be extended to the field of atomic gyroscopes.

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Dynamics of a Spin-Exchange Relaxation-Free Comagnetometer for Rotation Sensing

Cited by 25 publications

References 30 publications

Effects of Stochastic Magnetic Noise on the SERF Co‐Magnetometer

Effects of Stochastic Magnetic Noise on the SERF Co‐Magnetometer

Study on the Magnetic Noise Characteristics of Amorphous and Nanocrystalline Inner Magnetic Shield Layers of SERF Co-Magnetometer

In Situ Measurement of the Non‐Orthogonal Angles of Magnetic Field Coils Based on Single‐Beam Magnetic Resonance

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