Triaxial Vector Operation in Near-Zero Field of Atomic Magnetometer With Femtotesla Sensitivity

Lu, Fei; Lu, Jixi; Li, Bo; Yan, Yeguang; Zhang, Shaowen; Yin, Kaifeng; Ye, Mao; Han, Bangcheng

doi:10.1109/tim.2022.3162282

Cited by 14 publications

(7 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This work demonstrated, in accordance with Equations ( 17) and (18), that with a combination of sufficiently large amplitude and sufficiently high frequency applied oscillating magnetic field, appreciable improvements in measurement uncertainty can only be realized by way of improvements in the feedback loop response. In this work, these improvements are demonstrated when using feedback methods which capture a greater portion of the nonlinear response of the instrument to the increased perturbation amplitude and frequency (Equation ( 5)).…”

Section: Discussionsupporting

confidence: 74%

“…Improvements in production techniques and quality of components, accompanied by increased portability and sensitivity, has resulted in increased interest in optical atomic magnetometers, often called "optically pumped magnetometers" (OPMs). Recent work has demonstrated their ability to achieve sub-fT/ √ Hz sensitivities in near-zero field environments [15] and 3-axis vector sensitivity in near-zero-field environments [4,5,[16][17][18], µT-level environments with relatively small vector components orthogonal to the bias field [19], and yet more advances have been made in extending the operational range of spin-polarized optically pumped magnetometers into the Earth-field regime [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Feedback Methods for Vector Measurements Using an All-Optical Atomic Magnetometer

Bulatowicz

Tost

Walker

2023

Sensors

View full text Add to dashboard Cite

In this work, we look to compare three methods of feedback for the ultimate purpose of measuring the transverse vector components of a magnetic field using a synchronous light-pulse atomic scalar magnetometer with a few tens of fT/Hz sensitivity in Earth-field-scale magnetic environments. By applying modulation in the magnetic field to orthogonal axes, the respective vector components may, in principle, be separated from the scalar measurement. Success of this technique depends in significant part on the ability to measure and respond to these perturbations with low measurement uncertainty. Using high-speed least-squares fitting, the phase response of the atomic spins relative to the first harmonic of the optical pump pulse repetition rate is monitored and correspondingly adjusted into resonance with the natural Larmor precession frequency. This paper seeks to motivate and compare three distinct methods of feedback for this purpose. As a first step toward the full development of this technique, the present work uses a simplified version with modulation applied only along the bias field. All three methods investigated herein are shown to provide results that match well with the scalar magnetometer measurements and to depend on both the applied modulation amplitude and optimal feedback response to achieve low relative uncertainty.

show abstract

Section: Discussionsupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Feedback Methods for Vector Measurements Using an All-Optical Atomic Magnetometer

Bulatowicz

Tost

Walker

2023

Sensors

View full text Add to dashboard Cite

show abstract

“…It can be seen that the DC component of Pz(t) exhibits an absorption lineshape with the magnetic field to be measured, and the first harmonic component displays a dispersion lineshape. The linear region of the dispersion lineshape can be utilized for magnetic field measurement along the x-axis direction [25].…”

Section: Principlementioning

confidence: 99%

Detuned square-wave optical modulation zero-field atomic magnetometer

li,

han,

et al. 2023

6th Optics Young Scientist Summit (OYSS 2023)

View full text Add to dashboard Cite

In recent years, arrayed atomic magnetometers have been continuously applied in biomagnetic scenarios. However, the crosstalk between adjacent sensors introduced by the modulated magnetic fields significantly compromises the imaging accuracy of arrayed atomic magnetometers. To solve this problem, a detuned square-wave optical modulation zero-field atomic magnetometer configuration is developed and we provide an analytical solution of this method. In this scheme, the circularly polarized pump light is used to polarize alkali metal atoms longitudinally, and a beam of detuned square-wave modulated circularly polarized light is applied transversely to generate a light-shift modulation instead of the coil-generated modulated magnetic field. Then the transverse magnetic field is measured by the optical absorption method of longitudinally circularly polarized pump light. This scheme maintains the inherent advantage of high sensitivity in spinexchange relaxation-free (SERF) atomic magnetometers. Additionally, the all-optical configuration eliminates the need for additional modulated magnetic fields or radio frequency (RF) fields, thereby mitigating crosstalk issues associated with modulated magnetic fields in array applications. Consequently, this scheme exhibits great potential for arraying and is expected to be employed in magnetocardiography (MCG) and magnetoencephalography (MEG).

show abstract

“…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

View full text Add to dashboard Cite

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.

show abstract

Triaxial Vector Operation in Near-Zero Field of Atomic Magnetometer With Femtotesla Sensitivity

Cited by 14 publications

References 36 publications

Feedback Methods for Vector Measurements Using an All-Optical Atomic Magnetometer

Feedback Methods for Vector Measurements Using an All-Optical Atomic Magnetometer

Detuned square-wave optical modulation zero-field atomic magnetometer

Application of VCSEL in Bio-Sensing Atomic Magnetometers

Contact Info

Product

Resources

About