Parameter optimisation of miniaturised SERF magnetometer below relaxation rate saturation region

Li, Renjie; Liu, Ying; Li, Cao; Li, Shun; Li, Jiajie; Zhai, Yueyang

doi:10.1016/j.measurement.2023.112733

Cited by 16 publications

(3 citation statements)

References 29 publications

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“…Among them, magnetometers that can work under geomagnetic conditions mainly include the alkali-metal-or helium-based optically pumped magnetometers and the coherent population-trapping (CPT) magnetometers [44][45][46]. The magnetometers that work in the near-zero field are mainly referred to as SERF magnetometers and nonlinear magneto-optical rotation (NMOR) magnetometers [47][48][49].…”

Section: Classificationmentioning

confidence: 99%

Recent Progress of Atomic Magnetometers for Geomagnetic Applications

Zhao

Zhu

et al. 2023

Sensors

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The atomic magnetometer is currently one of the most-sensitive sensors and plays an important role in applications for detecting weak magnetic fields. This review reports the recent progress of total-field atomic magnetometers that are one important ramification of such magnetometers, which can reach the technical level for engineering applications. The alkali-metal magnetometers, helium magnetometers, and coherent population-trapping magnetometers are included in this review. Besides, the technology trend of atomic magnetometers was analyzed for the purpose of providing a certain reference for developing the technologies in such magnetometers and for exploring their applications.

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Section: Classificationmentioning

confidence: 99%

Recent Progress of Atomic Magnetometers for Geomagnetic Applications

Zhao

Zhu

et al. 2023

Sensors

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“…[ 11,12 ] Spin polarization is an important parameter to judge the performance of atomic magnetometers, [ 13 ] and it is generally believed that a moderate polarization can contribute to the efficient operation and high sensitivity of magnetometers. It is very important to determine the state of alkali metal atoms, [ 14,15 ] especially to determine the spin polarization and to optimize multiple physical parameters with spin polarization as the core standards.…”

Section: Introductionmentioning

confidence: 99%

In Situ Spin Polarization Measurement Method and Identification of Optimal Spin Polarization Range in Atomic Magnetometer

Li,

Zhai,

et al. 2024

Adv Quantum Tech

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In this study, an in situ measurement method of spin polarization in single‐beam atomic magnetometer is presented. Modeling magnetic linewidth by incorporating nonlinear attenuation along the propagation direction of light and employing the output response equation of magnetometers at zero‐field resonance. Utilizing the model for fitting to extract relaxation rate information, the photon absorption cross‐sections at three temperatures are estimated to be , , and , respectively. Further, the spin polarization curves are obtained by introducing the spin polarization equations. Given the diminishing marginal utility resulting from the enhancement of performance through increased spin polarization, long‐term sensitivity is employed to determine optimal spin polarization range. The optimal long‐term sensitivity for four displayed states is (@31.5Hz), while the ultimate minimum sensitivity is 10.7 (@31.5Hz). The optimal spin polarization ranges at three temperatures are 78.9%–87.1%, 82.3%–88.5%, and 84.5%–88.4%, respectively. The measurement method applied to single‐beam magnetometer can be easily extended to multi‐axis vector magnetometer. The determination of optimal spin polarization range is of great significance for the performance and stability of the magnetometer system, improving the sensitivity of magnetic field measurement, and ensuring its widespread application in bio‐magnetic measurement.

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“…Sensors based on alkali vapor find extensive applications across various research domains, including magnetometry, [ 1,2 ] inertial measurement, [ 3 ] and medical imaging. [ 4 ] The alkali vapor density is a recognized parameter known to significantly impact the performance in various areas of few‐body physics, including hyperpolarized non‐zero‐spin noble gas, [ 5,6 ] ultracold two‐body collisions, [ 7 ] quantized vortices, [ 8 ] vector soliton, [ 9 ] Josephson effect, [ 10,11 ] and more. Currently, there exist two primary established techniques for determining alkali vapor density within glass cells.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Rubidium Vapor Density Based on Spin‐Exchange Rate

Shang,

Zou,

Zhang

et al. 2024

Adv Quantum Tech

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An efficient method is proposed for quantifying rubidium vapor density by analyzing the spin‐exchange rate between alkali metals. This method effectively addresses two primary challenges in measuring alkali vapor density. First, it overcomes the limitation of absorption spectroscopy to measure vapor density under optically thick conditions, typically restricted to temperature higher than 420K, equivalent to alkali vapor density exceeding . Second, it mitigates the risk of disrupting shielding functionality due to the application of a strong magnetic field, often in the range of several tens of Gauss or higher, when employing the Faraday rotation for vapor‐density measurement. The spin‐exchange rate between atoms, inherently related to the vapor density, is evident in the electron‐paramagnetic‐resonance spectrum of spin‐polarized , thereby providing a possibility for measuring alkali vapor density. To eliminate overlap between two Lorentzian curves resulting from two decomposed components of an oscillating field, a small rotating magnetic field with identical amplitude and frequency but a 90‐degree phase shift along both the x and y axes is applied. This method is successfully employed to measure vapor density in the temperature range of 373–433 K, with the measured outcomes closely matching the saturation vapor curve.

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Parameter optimisation of miniaturised SERF magnetometer below relaxation rate saturation region

Cited by 16 publications

References 29 publications

Recent Progress of Atomic Magnetometers for Geomagnetic Applications

Recent Progress of Atomic Magnetometers for Geomagnetic Applications

In Situ Spin Polarization Measurement Method and Identification of Optimal Spin Polarization Range in Atomic Magnetometer

Measurement of Rubidium Vapor Density Based on Spin‐Exchange Rate

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