Quantitative study of optical pumping in the presence of spin-exchange relaxation

Shi, Yongqi; Scholtes, Theo; Grujić, Zoran; Lebedev, Victor; Dolgovskiy, Vladimir; Weis, A.

doi:10.1103/physreva.97.013419

Cited by 23 publications

(18 citation statements)

References 18 publications

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“…We conclude that an accurate description of the population's redistribution process in the ground state including spin-exchange (as for example in Ref. [44]) as well as the influence of the B 1 field is required for a more precise prediction of the line shapes.…”

Section: The Non-linear Zeeman Splittingmentioning

confidence: 88%

Sources of heading errors in optically pumped magnetometers operated in the Earth's magnetic field

et al. 2019

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When optically pumped magnetometers are aimed for the use in Earth's magnetic field, the orientation of the sensor to the field direction is of special importance to achieve accurate measurement result. Measurement errors and inaccuracies related to the heading of the sensor can be an even more severe problem in the case of special operational configurations, such as for example the use of strong off-resonant pumping. We systematically study the main contributions to the heading error in systems that promise high magnetic field resolutions at Earth's magnetic field strengths, namely the non-linear Zeeman splitting and the orientation dependent light shift. The good correspondence of our theoretical analysis to experimental data demonstrates that both of these effects are related to a heading dependent modification of the interaction between the laser light and the dipole moment of the atoms. Also, our results promise a compensation of both effects using a combination of clockwise and counter clockwise circular polarization.

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Section: The Non-linear Zeeman Splittingmentioning

confidence: 88%

Sources of heading errors in optically pumped magnetometers operated in the Earth's magnetic field

et al. 2019

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“…We compare the experimental results to those obtained with LPL and CPL. In a recent publication [3] we have studied optical pumping in a paraffin-coated Cs vapor cell, in which spin relaxation is dominated by anisotropic (F -and m-dependent) spin-exchange collisions. The measured quantities were the resonant absorption coefficients' dependence on laser power, κ 0 (P ), for the four Cs D 1 hyperfine transitions.…”

Section: Supplementary Materialsmentioning

confidence: 99%

“…In that paper we have also shown that under the assumption of isotropic relaxation, one can derive algebraic expressions for the κ 0 (P ) dependencies. Here we put these analytical results on the experimental test bench, by repeating the same experiments as described in reference [3] in an uncoated cell, which fulfills the condition of isotropic relaxation at room temperature.…”

Section: Supplementary Materialsmentioning

confidence: 99%

“…Since optical pumping reshuffles (in general) sublevel populations to less absorbing states, κ 0 decreases (in general) with increasing laser power P in . In reference [3] we have shown how the 16 steady-state sublevel populations of the Cs ground state p Fg,mg produced by optical pumping with light of power P in and polarization "POL" tuned to the F g → F e hyperfine transition are obtained as steady-state solutions of the 16 coupled algebraic rate equations…”

Section: Theorymentioning

confidence: 99%

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Cesium alignment produced by pumping with unpolarized light

Shi

Weis

2018

Eur. Phys. J. D

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We demonstrate optical pumping on the four hyperfine components of the Cs D1 transition by unpolarized (UPL) resonant laser light. The evidence is based on the reduction of the absorption coefficients κ0 with increasing light power P in an uncoated Cs vapor cell with isotropic spin relaxation. For comparison we perform the same quantitative κ0(P) measurements with linearly-polarized light (LPL) and circularly-polarized light (CPL). We find that our previously published algebraic expressions give an excellent description of all experimentally recorded induced transparency signals. Based on this we can make reliable absolute predictions for the power dependence of the spin orientation and alignment produced by pumping with LPL, CPL and UPL.

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“…In such sensors, atomic spin polarization is created using optical pumping [4,5] and its change due to the interaction with the magnetic field is monitored by optical means. Most commonly, the sensors monitor vector spin polarization (spin orientation), which is created with circularly polarized pumping light [6] and precesses in the magnetic field with the Larmor frequency ω L = γ |B|. In this study we focus on 133 Cs atoms in the ground state with the overall atomic spin F = 4.…”

Section: Introductionmentioning

confidence: 99%

Sensitive and stable vector magnetometer for operation in zero and finite fields

Bison¹,

Бондар²,

Schmidt-Wellenburg³

et al. 2018

Opt. Express

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We report on an optically pumped magnetometer that uses multiple laser beams to pump and probe spin-polarized Cs atoms. The selected sensor geometry allows for operation in finite magnetic fields as well as close to zero field. In finite fields the magnetometer employs free spin precession signals to determine the field modulus and direction as described in a separate publication. This publication focuses on the magnetometer operation close to zero field, which is based on a ground state Hanle resonance. The four laser beams permit the simultaneous measurement of two orthogonal magnetic field components in a differential detection scheme that greatly suppresses technical laser power noise. Sensitivities better than 54 fT/Hz could be demonstrated simultaneously for both measurement channels in a well shielded environment. A minimum Allan deviation, limited by residual field fluctuations, of better than 40 fT was observed for integration times of 2s. The magnetometer achieves high sensitivity and stability in offset fields as well as close to zero field and is, thus, a universal tool for low frequency magnetic field measurements.

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Quantitative study of optical pumping in the presence of spin-exchange relaxation

Cited by 23 publications

References 18 publications

Sources of heading errors in optically pumped magnetometers operated in the Earth's magnetic field

Sources of heading errors in optically pumped magnetometers operated in the Earth's magnetic field

Cesium alignment produced by pumping with unpolarized light

Sensitive and stable vector magnetometer for operation in zero and finite fields

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