Features of the Formation of the Spin Polarization of an Alkali Metal at the Resolution of Hyperfine Sublevels in the 2S1/2 State

Попов, Е. Н.; Bobrikova, V. A.; Voskoboinikov, S. P.; Баранцев, К. А.; Ustinov, S. M.; Литвинов, А. Н.; Vershovskiĭ, A. K.; Dmitriev, S. P.; Kartoshkin, V. A.; Pazgalev, A. S.; Петренко, М. В.

doi:10.1134/s0021364018200122

Cited by 16 publications

(6 citation statements)

References 36 publications

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“…A single OP/OD beam is tuned to a frequency close to the frequency of the optical transitions F = I -½ ↔ F' = I ± ½ of the S 1/2 ground state of an alkali metal (in our experimental work, we use Cs, although the method is also applicable to other alkali metals, such as Rb and K). As shown in [10,33,34], and theoretically substantiated in [35], such a beam is capable of performing both Zeeman and hyperfine pumping. The beam depletes the F = I -½ level and reduces the optical density of the medium; in addition, it strongly polarizes the Zeeman structure of the F = I +½ level, forming the stretched state.…”

Section: Description Of the Methodsmentioning

confidence: 79%

Single-Beam All-Optical Nonzero-Field Magnetometric Sensor for Magnetoencephalography Applications

2021

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We present a method for measuring the magnetic field that allows hyperfine and Zeeman optical pumping, excitation and detection of magnetic resonance by means of a single laser beam with timemodulated ellipticity. This improvement allows us to significantly simplify the Bell-Bloom magnetometric scheme, while retaining its sensitivity. The method does not require the use of radio frequency fields, which is essential when creating arrays of sensors. The results of experimental studies demonstrate the efficiency of the proposed method and its potential applicability in most challenging magnetoencephalographic tasks.

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Section: Description Of the Methodsmentioning

confidence: 79%

Single-Beam All-Optical Nonzero-Field Magnetometric Sensor for Magnetoencephalography Applications

2021

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“…In the proposed sensor, the well-known method of MR excitation [13] by a beam directed transversely to the magnetic field and modulated at the precession frequency of magnetic moments (Larmor frequency) is used in the pumping scheme, in which the light suppression of the spin-exchange broadening of MR at hyperfine level F = I + 1/2 (I is the nucleus moment, for Cs I = 7/2) is realized with a monochromatic laser pumping tuned to resonance with a transition from ultrafine level F = I -1/2 [14]. MR is detected at the Larmor frequency (the so-called "M X -scheme") by the rotation of the polarization of a nonresonant linearly polarized transverse probe beam.…”

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confidence: 99%

All-Optical Magnetometric Sensor for Magnetoencephalography and Ultralow Field Tomography

2020

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A variant of the scheme of a magnetometric sensor based on cesium atomic vapor is proposed and experimentally investigated. The sensor uses magnetic resonance excitation by modulated light of an hyperfine optical pumping that is transverse to the magnetic field. It is shown that, for a cell with a volume of 0.125 cm 3 , the variational sensitivity of such a scheme, estimated from the ratio of the steepness of the signal in the center of the magnetic resonance to the shot noise of the detecting radiation, reaches a level of <10 fT/Hz 1/2 in the frequency band width of the order of 850 Hz. The sensor, which does not emit radio frequency fields, is designed for use in magnetoencephalographic complexes. Possible ways to improve the performance of the scheme for detecting relatively fast (~4.2 kHz in a field of 0.1 mT) signals of the precession of proton magnetic moments in promising ultra-weak field tomography schemes are considered.

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“…Tuning the circularly polarized pumping beam into resonance with the F = 3 ↔ F = 3, 4 transition (hereinafter, prime indexes refer to the optical excited state) makes it possible to increase the signal several times compared to the widely used F = 4 ↔ F = 3, 4 pumping scheme. This effect, first discovered in [21], was studied in detail for buffer gas cell in [25], and for a coated cell -in [26]. The operation of the magnetometer in M X mode provides a high response speed unattainable in the M Z scheme, and the use of two-beam scheme makes it possible to further increase the sensitivity as compared to [21].…”

Section: Non-zero Field Sensor For Megmentioning

confidence: 96%

Towards the non-zero field cesium magnetic sensor array for magnetoencephalography

Петренко¹,

Дмитриев²,

Pazgalev³

et al. 2021

Preprint

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Magnetic sensors developed for application in magnetoencephalography must meet a number of requirements; the main ones are compactness, sensitivity and response speed. We present a quantum optically pumped atomic sensor with cell volume of 0.5cm3 that meets these requirements and is operable in nonzero magnetic fields. The ultimate sensitivity of the sensor was estimated as (using the criteria of the ratio of the slope of the magnetic resonance signal to the shot noise spectral density) to be better than 5 fT/Hz1/2. The actual sensitivity, measured in a gradiometric scheme, reaches 13 fT/Hz1/2 per sensor. We also present a novel and fast algorithm for optimization of the geometric properties of non-zero field sensor array with respect to maximization of the information transfer rate for cortical sources.

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Features of the Formation of the Spin Polarization of an Alkali Metal at the Resolution of Hyperfine Sublevels in the 2S1/2 State

Cited by 16 publications

References 36 publications

Single-Beam All-Optical Nonzero-Field Magnetometric Sensor for Magnetoencephalography Applications

Single-Beam All-Optical Nonzero-Field Magnetometric Sensor for Magnetoencephalography Applications

All-Optical Magnetometric Sensor for Magnetoencephalography and Ultralow Field Tomography

Towards the non-zero field cesium magnetic sensor array for magnetoencephalography

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