Single beam Cs-Ne SERF atomic magnetometer with the laser power differential method

chen, yao; Zhao, Libo; Zhang, Ning; Yu, Mingzhi; Ma, Yintao; han, xiangguang; zhao, Man; Lin, Qijing; Yang, Ping; Jiang, Zhuangde

doi:10.1364/oe.450571

Cited by 24 publications

(15 citation statements)

References 34 publications

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“…Magnetic noise limits the enhancement of the sensitivity index, particularly in ultra-high-sensitivity magnetometers [ 26 ]. The sensitive axis of the magnetic field is generally oriented in the radial direction with an excellent magnetic shielding coefficient [ 2 , 4 , 27 ]. This study analyzed the influence of air gap on the shielding coefficient of conventional ferrite magnetic shields and FMCS structures.…”

Section: Experimental Calculation Results and Discussionmentioning

confidence: 99%

“…Numerous ultra-high sensitivity atomic sensors that use quantum effects to detect physical quantities, such as atomic magnetometer [ 1 , 2 ], atomic gyroscope [ 3 , 4 ], atomic clock [ 5 ], and superconducting quantum interferometer [ 6 , 7 ], are magnetic-field sensitive. The stability of the environmental magnetic field has a direct effect on the measurement performance of sensors.…”

Section: Introductionmentioning

confidence: 99%

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A High-Performance Magnetic Shield with MnZn Ferrite and Mu-Metal Film Combination for Atomic Sensors

Fang

Sun

et al. 2022

Materials

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This study proposes a high-performance magnetic shielding structure composed of MnZn ferrite and mu-metal film. The use of the mu-metal film with a high magnetic permeability restrains the decrease in the magnetic shielding coefficient caused by the magnetic leakage between the gap of magnetic annuli. The 0.1–0.5 mm thickness of mu-metal film prevents the increase of magnetic noise of composite structure. The finite element simulation results show that the magnetic shielding coefficient and magnetic noise are almost unchanged with the increase in the gap width. Compared with conventional ferrite magnetic shields with multiple annuli structures under the gap width of 0.5 mm, the radial shielding coefficient increases by 13.2%, and the magnetic noise decreases by 21%. The axial shielding coefficient increases by 22.3 times. Experiments verify the simulation results of the shielding coefficient of the combined magnetic shield. The shielding coefficient of the combined magnetic shield is 16.5%. It is 91.3% higher than the conventional ferrite magnetic shield. The main difference is observed between the actual and simulated relative permeability of mu-metal films. The combined magnetic shielding proposed in this study is of great significance to further promote the performance of atomic sensors sensitive to magnetic field.

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Section: Experimental Calculation Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A High-Performance Magnetic Shield with MnZn Ferrite and Mu-Metal Film Combination for Atomic Sensors

Fang

Sun

et al. 2022

Materials

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“…The magnetometer has a sensitivity of 35

and can be used for cardiac magnetic measurements. Some recent applications for SERF magnetometers related to parameter optimization [ 118 ], differential measurement [ 119 , 120 ], and triaxial measurement [ 121 ] are using DFB lasers for the light source, and perhaps VCSELs with low noise and high frequency stability will be used as the light source for further miniaturization and integration.…”

Section: Application Of Vcsel In a Chip-scale Atomic Magnetometermentioning

confidence: 99%

Application of VCSEL in Bio-Sensing Atomic Magnetometers

et al. 2022

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Recent years have seen rapid development of chip-scale atomic devices due to their great potential in the field of biomedical imaging, namely chip-scale atomic magnetometers that enable high resolution magnetocardiography (MCG) and magnetoencephalography (MEG). For atomic devices of this kind, vertical cavity surface emitting lasers (VCSELs) have become the most crucial components as integrated pumping sources, which are attracting growing interest. In this paper, the application of VCSELs in chip-scale atomic devices are reviewed, where VCSELs are integrated in various atomic bio-sensing devices with different operating environments. Secondly, the mode and polarization control of VCSELs in the specific applications are reviewed with their pros and cons discussed. In addition, various packaging of VCSEL based on different atomic devices in pursuit of miniaturization and precision measurement are reviewed and discussed. Finally, the VCSEL-based chip-scale atomic magnetometers utilized for cardiac and brain magnetometry are reviewed in detail. Nowadays, biosensors with chip integration, low power consumption, and high sensitivity are undergoing rapid industrialization, due to the growing market of medical instrumentation and portable health monitoring. It is promising that VCSEL-integrated chip-scale atomic biosensors as featured applications of this kind may experience extensive development in the near future.

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“…In the sensor described herein, the decision to use cesium as the sensing atom was informed by the expected operating temperature required to achieve optimal sensitivity, which is ≃30°C lower than that of rubidium. 20,21 Furthermore, cesium has a well-demonstrated suitability in the field of biomagnetic sensing. 22 Careful selection of the sensing atom to inform skin-safe sensor operation temperature is similarly demonstrated by room-temperature helium zero-field sensors.…”

Section: Introductionmentioning

confidence: 99%

Portable single-beam cesium zero-field magnetometer for magnetocardiography

Dawson,

O’Dwyer,

Mrozowski

et al. 2023

J. Optical Microsystems

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Optically pumped magnetometers (OPMs) are becoming common in the realm of biomagnetic measurements. We discuss the development of a prototype zero-field cesium portable OPM and its miniaturized components. Zero-field sensors operate in a very low static magnetic field environment and exploit physical effects in this regime. OPMs of this type are extremely sensitive to small magnetic fields, but they bring specific challenges to component design, material choice, and current routing. The miniaturized cesium atomic vapor cell within this sensor has been produced through integrated microfabrication techniques. The cell must be heated to 120°C for effective sensing, while the sensor external faces must be skin safe ≤40°C making it suitable for use in biomagnetic measurements. We demonstrate a heating system that results in a stable outer package temperature of 36°C after 1.5 h of 120°C cell heating. This relatively cool package temperature enables safe operation on human subjects which is particularly important in the use of multi-sensor arrays. Biplanar printed circuit board coils are presented that produce a reliable homogeneous field along three axes, compensating residual fields and occupying only a small volume within the sensor. The performance of the prototype portable sensor is characterized through a measured sensitivity of 90 fT∕ ffiffiffiffiffiffi Hz p in the 5 to 20 Hz frequency band and demonstrated through the measurement of a cardiac magnetic signal.

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Single beam Cs-Ne SERF atomic magnetometer with the laser power differential method

Cited by 24 publications

References 34 publications

A High-Performance Magnetic Shield with MnZn Ferrite and Mu-Metal Film Combination for Atomic Sensors

A High-Performance Magnetic Shield with MnZn Ferrite and Mu-Metal Film Combination for Atomic Sensors

Application of VCSEL in Bio-Sensing Atomic Magnetometers

Portable single-beam cesium zero-field magnetometer for magnetocardiography

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