Analysis of influence of RF power and buffer gas pressure on sensitivity of optically pumped cesium magnetometer

Shi, Rongye; Wang, Yanhui

doi:10.1088/1674-1056/22/10/100703

Cited by 11 publications

(6 citation statements)

References 14 publications

(18 reference statements)

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“…The experimental results show that the square of the linewidth has a quadratic dependence on the relative RF amplitude, which agrees with the theoretical result in Ref. [21]. Under our experimental conditions, the depolarization due to the RF magnetic field can be regarded as perturbation.…”

Section: Experiments and Discussionsupporting

confidence: 92%

“…Since the alkali atoms can be depolarized by diverse mechanisms, steps should be taken to suppress the spin relaxation. Two methods are commonly applied to suppress the relaxation due to wall collisions, one is the introduction of buffer gas into the cell, [18][19][20][21] the other one is the use of antirelaxation coatings. [22][23][24][25][26] The relaxation due to spin-exchange collisions can be completely eliminated through operating in the spin-exchange-relaxation-free (SERF) regime, or partially suppressed by light narrowing.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Intrinsic transverse relaxation mechanisms of polarized alkali atoms enclosed in radio-frequency magnetometer cell*

Yuan

2019

Chinese Phys. B

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The intrinsic transverse relaxation mechanisms of polarized alkali atoms enclosed in the radio-frequency magnetometer cell are investigated. The intrinsic transverse relaxation rate of cesium atoms as a function of cell temperature is obtained. The absorption of alkali atoms by the glass wall and the reservoir effect are the main error factors which contribute to the disagreements between theory and experiments. A modified relaxation model is presented, in which both the absorption of alkali atoms by the glass wall and the reservoir effect are included. This study provides a more accurate description of the intrinsic transverse relaxation mechanisms of polarized alkali atoms, and enlightens the optimization of the cell design.

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Section: Experiments and Discussionsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Intrinsic transverse relaxation mechanisms of polarized alkali atoms enclosed in radio-frequency magnetometer cell*

Yuan

2019

Chinese Phys. B

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“…[2] In the 1950s, Kaslter et al developed optical methods to polarize and probe the spin of unpaired electron. [3,4] Since then, there appears a lot of researches on different magnetic resonance magnetometers, such as Bell-Bloom magnetometer, [5][6][7] Mx magnetomter, [8][9][10] Mz magnetomter, [11,12] CPT (coherent population trapping) magnetometer, [13,14] and SERF (spin exchange relaxation free) magnetometer, [15][16][17][18] etc. One of the most important issues of these magnetometers is the magnetic resonance linewidth which is related directly to the fundamental sensitivity of atomic magnetometer by δ B = (1/γ) ∆ω/nV t, where ∆ω is the linewidth of the magnetometer, n is the density of the alkali atoms, V is the cell volume, t is the measurement time, and γ is the gyromagnetic ratio of the alkali atom.…”

Section: Introductionmentioning

confidence: 99%

Combined effect of light intensity and temperature on the magnetic resonance linewidth in alkali vapor cell with buffer gas

Gao¹,

Dong²,

Wang³

et al. 2017

Chinese Phys. B

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One of the peculiar phenomenons in non-zero magnetic resonance magnetometer is that, with the increase of the temperature, the magnetic resonance linewidth is narrowed at first instead of broadened due to the increasing collision rate. The magnetometer usually operates at the narrowest linewidth temperature to obtain the best sensitivity. Here, we explain this phenomenon quantitatively considering the nonlinear of the optical pumping in the cell and did experiments to verify this explanation. The magnetic resonance linewidth is measured using one amplitude-modulated pump laser and one continuous probe laser. The field is along the direction orthogonal to the plane of pump and probe beams. We change the temperature from 53 • C to 93 • C and the pumping light from 0.1 mW to 2 mW. The experimental results agree well with the theoretical calculations.

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“…[12] Therefore, a passive magnetic shield and active magnetic compensation methods are always used in the atomic magnetometer to shield the earth's magnetic field. [13,14] However, there is a small magnetic field gradient in the shield, which would increase the relaxation rate of the alkali atoms. [15] Therefore, precisely measuring the magnetic field gradient is vital to the spin relaxation study.…”

Section: Introductionmentioning

confidence: 99%

In-situ measurement of magnetic field gradient in a magnetic shield by a spin-exchange relaxation-free magnetometer

et al. 2015

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A method of measuring in-situ magnetic field gradient is proposed in this paper. The magnetic shield is widely used in the atomic magnetometer. However, there is magnetic field gradient in the magnetic shield, which would lead to additional gradient broadening. It is impossible to use an ex-situ magnetometer to measure magnetic field gradient in the region of a cell, whose length of side is several centimeters. The method demonstrated in this paper can realize the in-situ measurement of the magnetic field gradient inside the cell, which is significant for the spin relaxation study. The magnetic field gradients along the longitudinal axis of the magnetic shield are measured by a spin-exchange relaxation-free (SERF) magnetometer by adding a magnetic field modulation in the probe beam’s direction. The transmissivity of the cell for the probe beam is always inhomogeneous along the pump beam direction, and the method proposed in this paper is independent of the intensity of the probe beam, which means that the method is independent of the cell’s transmissivity. This feature makes the method more practical experimentally. Moreover, the AC-Stark shift can seriously degrade and affect the precision of the magnetic field gradient measurement. The AC-Stark shift is suppressed by locking the pump beam to the resonance of potassium’s D1 line. Furthermore, the residual magnetic fields are measured with σ+- and σ–-polarized pump beams, which can further suppress the effect of the AC-Stark shift. The method of measuring in-situ magnetic field gradient has achieved a magnetic field gradient precision of better than 30 pT/mm.

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Analysis of influence of RF power and buffer gas pressure on sensitivity of optically pumped cesium magnetometer

Cited by 11 publications

References 14 publications

Intrinsic transverse relaxation mechanisms of polarized alkali atoms enclosed in radio-frequency magnetometer cell*

Intrinsic transverse relaxation mechanisms of polarized alkali atoms enclosed in radio-frequency magnetometer cell*

Combined effect of light intensity and temperature on the magnetic resonance linewidth in alkali vapor cell with buffer gas

In-situ measurement of magnetic field gradient in a magnetic shield by a spin-exchange relaxation-free magnetometer

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