Vectorial atomic magnetometer based on coherent transients of laser absorption in Rb vapor

Lenci, Lorenzo; Auyuanet, A.; Barreiro, S.; Valente, P.; Lezama, A.; Failache, H.

doi:10.1103/physreva.89.043836

Cited by 25 publications

(18 citation statements)

References 19 publications

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“…In the case of a linear sweep through the resonance the frequency of the transient is chirped [18] and behaves similarly to a Landau-Zener (LZ) transition [20,21]. Transients have also been used as a magnetic sensing technique to measure the Earth's magnetic field with 1 nT √ Hz sensitivity [22,23]. In this article we take both the concepts of multimode spectrum and transient dynamics and combine them to create a new method for measuring coherent effects.…”

Section: Introductionmentioning

confidence: 99%

Transient coherence of media under strong phase modulation exploiting electromagnetically induced transparency

Shwa

Katz

2014

Phys. Rev. A

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When quantum systems are shifted faster than their transition and coupling time scales, their susceptibility is dramatically modified. We measure the optical susceptibility of a strongly modulated electromagnetically induced transparency system. Time vs detuning plots for different pump modulation frequencies reveal a transition between an adiabatic regime where a series of smooth pulses are created and a nonadiabatic regime where a strong transient oscillating response is added. Applying a magnetic field lifts the hyperfine level degeneracy, revealing an interference effect between the different magnetic level transients. We explore the dynamics of the magnetic and nonmagnetic cases and discuss their coherent nature. We finally combine the global phase of the transmitted pulses with the transient interference to achieve broadband magnetic sensing without losing the sensitivity of a single electromagnetically induced transparency line.

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Section: Introductionmentioning

confidence: 99%

Transient coherence of media under strong phase modulation exploiting electromagnetically induced transparency

Shwa

Katz

2014

Phys. Rev. A

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“…FSP signals have been deployed for specific magnetometry tasks using (nuclear) spin-polarized mercury atoms [15] and 3 He atoms [16,17], or (electronic) spinpolarized alkali atoms [18][19][20]. The good signal to noise ratio and simplicity of its implementation makes the FSP technique based on atomic alignment (i.e., using linearly polarized light) a useful tool for the easy calibration of magnetic coils [21], or for measuring the magnetic field orientation and modulus [20].…”

Section: Fsp Magnetometrymentioning

confidence: 99%

“…The good signal to noise ratio and simplicity of its implementation makes the FSP technique based on atomic alignment (i.e., using linearly polarized light) a useful tool for the easy calibration of magnetic coils [21], or for measuring the magnetic field orientation and modulus [20]. Recently an FSP magnetometer using nuclear-spin-polarized 3 He gas was reported claiming a relative precision ΔB 0 /B 0 below 10 −12 for the determination of fields B 0 > 100 mT [16].…”

Section: Fsp Magnetometrymentioning

confidence: 99%

A sensitive and accurate atomic magnetometer based on free spin precession

et al. 2015

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Abstract. We present a laser-based atomic magnetometer that allows inferring the modulus of a magnetic field from the free Larmor precession of spin-oriented Cs vapour atoms. The detection of free spin precession (FSP) is not subject to systematic readout errors that occur in phase feedback-controlled magnetometers in which the spin precession is actively driven by an oscillating field or a modulation of light parameters, such as frequency, amplitude, or polarization. We demonstrate that an FSP-magnetometer can achieve a ∼200 fT/ √ Hz sensitivity (<100 fT/ √ Hz in the shotnoise limit) and an absolute accuracy at the same level.

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“…The

signal component is the free-precession signal of 87 Rb and corresponds to the Earth’s magnetic field of

. The harmonic at

may arise due to orientation-to-alignment conversion due to the linearly polarized probe laser or due to a background magnetic field with a vector component parallel to the pump beam [ 56 , 57 ].…”

Section: Results and Discussionmentioning

confidence: 99%

Pulsed Optically Pumped Magnetometers: Addressing Dead Time and Bandwidth for the Unshielded Magnetorelaxometry of Magnetic Nanoparticles

Jaufenthaler

Kornack

Lebedev

et al. 2021

Sensors

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Magnetic nanoparticles (MNP) offer a large variety of promising applications in medicine thanks to their exciting physical properties, e.g., magnetic hyperthermia and magnetic drug targeting. For these applications, it is crucial to quantify the amount of MNP in their specific binding state. This information can be obtained by means of magnetorelaxometry (MRX), where the relaxation of previously aligned magnetic moments of MNP is measured. Current MRX with optically pumped magnetometers (OPM) is limited by OPM recovery time after the shut-off of the external magnetic field for MNP alignment, therewith preventing the detection of fast relaxing MNP. We present a setup for OPM-MRX measurements using a commercially available pulsed free-precession OPM, where the use of a high power pulsed pump laser in the sensor enables a system recovery time in the microsecond range. Besides, magnetometer raw data processing techniques for Larmor frequency analysis are proposed and compared in this paper. Due to the high bandwidth (≥100 kHz) and high dynamic range of our OPM, a software gradiometer in a compact enclosure allows for unshielded MRX measurements in a laboratory environment. When operated in the MRX mode with non-optimal pumping performance, the OPM shows an unshielded gradiometric noise floor of about 600 fT/cm/Hz for a 2.3 cm baseline. The noise floor is flat up to 1 kHz and increases then linearly with the frequency. We demonstrate that quantitative unshielded MRX measurements of fast relaxing, water suspended MNP is possible with the novel OPM-MRX concept, confirmed by the accurately derived iron amount ratios of MNP samples. The detection limit of the current setup is about 1.37 μg of iron for a liquid BNF-MNP-sample (Bionized NanoFerrite) with a volume of 100 μL.

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Vectorial atomic magnetometer based on coherent transients of laser absorption in Rb vapor

Cited by 25 publications

References 19 publications

Transient coherence of media under strong phase modulation exploiting electromagnetically induced transparency

Transient coherence of media under strong phase modulation exploiting electromagnetically induced transparency

A sensitive and accurate atomic magnetometer based on free spin precession

Pulsed Optically Pumped Magnetometers: Addressing Dead Time and Bandwidth for the Unshielded Magnetorelaxometry of Magnetic Nanoparticles

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