Determination of Spin Polarization in Spin-Exchange Relaxation-Free Atomic Magnetometer Using Transient Response

Zhao, Jiheng; Ding, M. D.; Lu, Jixi; Yang, Ke; Ma, Danyue; Yao, Han; Han, Bangcheng; Liu, Gang

doi:10.1109/tim.2019.2905308

Cited by 45 publications

(19 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The slope of the zero-field resonance become smaller with the increase of the pumping light power. That may be due to the virtual magnetic field caused by the AC-stark effect or the heterogeneity of the spin polarization [25], [26]. In Figure 5 (b), we show the variation in the zero-field resonance under different operating temperatures of 180 • C, 190 • C, and 200 • C when the pumping light power was 3 mW.…”

Section: Experimental Setup and Methodsmentioning

confidence: 99%

“…We apply a low-pass filter with a cut-off frequency of 8 Hz to eliminate the high frequency oscillation. The cut-off frequency can be preliminary calculated using ω = γ e B q [25],and finally determined by test considering the experimental condition. The first order differential value after filtering is shown in Figure 6 (d).…”

Section: Experimental Setup and Methodsmentioning

confidence: 99%

See 1 more Smart Citation

A Non-Modulated Triaxial Magnetic Field Compensation Method for Spin-Exchange Relaxation-Free Magnetometer Based on Zero-Field Resonance

Zhao

Liu

et al. 2019

IEEE Access

Self Cite

View full text Add to dashboard Cite

In this study, we demonstrate a non-modulated triaxial magnetic field compensation method for spin-exchange relaxation-free (SERF) atomic magnetometers. We realize simultaneous compensation of the magnetic field along the pump and probe directions by maximizing the first order differential value of the zero-field resonance signal. The magnetic field perpendicular to the pump-probe plane is compensated by zeroing the DC response of the magnetometer. The zero-field resonance is obtained by applying a linearly changed magnetic field along the direction perpendicular to that of the pump-probe plane. The first order differential of the zero-field resonance is acquired using the second order central difference method in real time. Compared with the conventional compensation methods, this method does not involve modulation and demodulation. Therefore, it requires no lock-in amplifier, thus making it more applicable in miniature atomic devices. Moreover, this method compensates the magnetic field along the pump and probe directions using only one criterion. It avoids the cross-talk effect between the pump and probe directions in the presence of non-orthogonal coils. The experiment results show that the compensation resolution is 9 pT, 7 pT and 0.05 pT for the probe, pump, and direction perpendicular to the pump-probe plane, respectively. INDEX TERMS Atomic magnetometer, cross-talk effect, magnetic field compensation, non-modulated, spin-exchange relaxation-free, zero-field resonance.

show abstract

Section: Experimental Setup and Methodsmentioning

confidence: 99%

Section: Experimental Setup and Methodsmentioning

confidence: 99%

A Non-Modulated Triaxial Magnetic Field Compensation Method for Spin-Exchange Relaxation-Free Magnetometer Based on Zero-Field Resonance

Zhao

Liu

et al. 2019

IEEE Access

Self Cite

View full text Add to dashboard Cite

show abstract

“…There are essentially three kinds of heating techniques used for SERF atomic magnetometers, as well as other sensitive atomic sensors: hot air heating [15][16][17][18], optical heating [4,[19][20][21] and electrical heating [9,[22][23][24][25]. Among these heating techniques, electrical heating is most flexible and efficient, and thus widely used in all kinds of atomic sensors.…”

Section: Introductionmentioning

confidence: 99%

“…Because the current through adjacent wires cannot overlap completely, the amplitude of the magnetic field cannot be suppressed sufficiently, and low-frequency magnetic noise can still interfere with the measurement. Therefore, these two methods are usually used in combination with each other [9,[22][23][24][25]. It can be seen that accurate measurement of the amplitude of electrical-heating-induced magnetic field is important, which could help estimate the electrical heater's effect and guide the improvement of it.…”

Section: Introductionmentioning

confidence: 99%

In-Situ Measurement of Electrical-Heating-Induced Magnetic Field for an Atomic Magnetometer

Wang

Yang

et al. 2020

Sensors

Self Cite

View full text Add to dashboard Cite

Electrical heating elements, which are widely used to heat the vapor cell of ultrasensitive atomic magnetometers, inevitably produce a magnetic field interference. In this paper, we propose a novel measurement method of the amplitude of electrical-heating-induced magnetic field for an atomic magnetometer. In contrast to conventional methods, this method can be implemented in the atomic magnetometer itself without the need for extra magnetometers. It can distinguish between different sources of magnetic fields sensed by the atomic magnetometer, and measure the three-axis components of the magnetic field generated by the electrical heater and the temperature sensor. The experimental results demonstrate that the measurement uncertainty of the heater’s magnetic field is less than 0.2 nT along the x-axis, 1.0 nT along the y-axis, and 0.4 nT along the z-axis. The measurement uncertainty of the temperature sensor’s magnetic field is less than 0.02 nT along all three axes. This method has the advantage of measuring the in-situ magnetic field, so it is especially suitable for miniaturized and chip-scale atomic magnetometers, where the cell is extremely small and in close proximity to the heater and the temperature sensor.

show abstract

“…An atomic magnetometer operating in the spin-exchange relaxation-free (SERF) regime has achieved the highest sensitivity in low-frequency magnetic field measurement --0.16 fT / Hz 1 / 2 [10]. The SERF magnetometer needs to work in SERF regime which requires efficient laser pumping, weak magnetic fields environment and uniform high temperature environment [11][12][13]. Laser pumping technology achieves the spin polarization of alkali metal atoms, so that the alkali metal atomic spin direction is consistent; the weak magnetic field environment is the precondition of the atomic SERF regime, while the uniform high temperature environment is for high density and even distribution of alkali metal atoms.…”

Section: Introductionmentioning

confidence: 99%

Multilayer Spindle Shaped Magnetic Shielding Device for SERF Atomic Magnetometer Application

et al. 2020

View full text Add to dashboard Cite

Most of shielding devices currently used for SERF magnetometers are multilayer cylindrical magnetic shielding barrels. This paper studies a new multilayer spindle shaped magnetic shielding barrel for the spin exchange relaxation free (SERF) magnetometer shielding system and uses finite element method (FEM) to compare the analysis results. The results show that the shielding effect of the spindle shaped magnetic shielding barrel is better than the traditional cylindrical magnetic shielding barrel, while the volume is reduced by about 1/5 and the weight is reduced by about 1/4. Therefore, we expect that a smallsized, lightweight , low-cost and more efficient magnetic shielding device can be obtained.

show abstract

Determination of Spin Polarization in Spin-Exchange Relaxation-Free Atomic Magnetometer Using Transient Response

Cited by 45 publications

References 25 publications

A Non-Modulated Triaxial Magnetic Field Compensation Method for Spin-Exchange Relaxation-Free Magnetometer Based on Zero-Field Resonance

A Non-Modulated Triaxial Magnetic Field Compensation Method for Spin-Exchange Relaxation-Free Magnetometer Based on Zero-Field Resonance

In-Situ Measurement of Electrical-Heating-Induced Magnetic Field for an Atomic Magnetometer

Multilayer Spindle Shaped Magnetic Shielding Device for SERF Atomic Magnetometer Application

Contact Info

Product

Resources

About