A kilohertz bandwidth and sensitive scalar atomic magnetometer using an optical multipass cell

Li, Shuguang; Liu, Jinsheng; Jin, Ming; Tetteh, Akiti Kenneth; Dai, Pengfeng; Xu, Zekai; Nwodom, Tochukwu Eric-Theophilus

doi:10.1016/j.measurement.2022.110704

Cited by 23 publications

(6 citation statements)

References 41 publications

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“…Since the spin-exchange relaxation-free (SERF) phenomenon was discovered in 1973, [1] atomic magnetometers based on SERF have made great progress over the years. They have been widely applied in fundamental physics research, [2][3][4] anomalous force research, [5,6] material characterization, [7] detection of anomalous objects, [8] magnetic source imaging refer to magnetocardiography(MCG) [9,10] and magnetoencephalography(MEG). [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.…”

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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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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“…This paper aims to provide a more general analysis of the behaviour of a Bell-and-Bloom magnetometer when it operates in the presence of a generic time dependent field that is parallel to the static (bias) one. The availability of a more accurate model is of relevance when the output of a magnetometer is used as an error-signal to implement feedback based field-stabilization systems [36][37][38][39][40], as well as when designing feed-forward ones [41] or when evaluating the effects of strong stray fields. The later is of particular relevance for systems operated in unshielded environment [9,42].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response of a Light-Modulated Magnetometer to Time Dependent Field

Bevilacqua¹,

Biancalana²,

Dancheva³

2023

Preprint

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The dynamic response of a Bell-and-Bloom magnetometer to a parallel (to the bias field) time-dependent field is modelled beyond the commonly assumed quasi-static regime. The results unveil features that are related to the parametric nature of the considered system. It is shown that a for low-amplitude time-dependent field different operating conditions are possible and that, beside the commonly reported low-pass-filter behaviour, a band-pass response emerges. Moreover, we numerically show that for larger field amplitude the system, due to its parametric nature, has a kind of ``non-linear'' response.

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“…The availability of a more accurate model is of relevance when the output of a magnetometer is used as an error signal to implement feedback-based field stabilization systems [38][39][40][41][42], as well as when designing feed-forward ones [43] or when evaluating the effects of strong stray fields, which is of particular relevance for systems operating in unshielded environments [11,44].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response of a Light-Modulated Magnetometer to Time-Dependent Fields

Bevilacqua

Biancalana

Dancheva

2023

Atoms

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The dynamic response of a Bell-and-Bloom magnetometer to a parallel (to the bias field) time-dependent field is studied by means of a model that goes beyond the commonly assumed quasi-static regime. The findings unveil features that are related to the parametric nature of the considered system. It is shown that for low-amplitude time-dependent fields, different operating conditions are possible and that, besides the commonly reported low-pass filter behavior, a band-pass response emerges. Moreover, we show that a larger amplitude of the time-dependent field makes the parametric nature of the system appear more clearly in the output signal. A harmonic analysis of the latter is numerically performed to highlight and characterize these emerging features.

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A kilohertz bandwidth and sensitive scalar atomic magnetometer using an optical multipass cell

Cited by 23 publications

References 41 publications

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

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

Dynamic Response of a Light-Modulated Magnetometer to Time Dependent Field

Dynamic Response of a Light-Modulated Magnetometer to Time-Dependent Fields

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