Micron-thick spectroscopic cells for studying the Paschen-Back regime on the hyperfine structure of cesium atoms

Sargsyan, A.; Glushko, B.; Sarkisyan, D.

doi:10.1134/s1063776115040159

Cited by 20 publications

(8 citation statements)

References 23 publications

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“…1). The transition labelled GT + is the so-called "guiding" transition for σ + transitions: its intensity remains the same in the whole range of magnetic fields from 0 to 10 kG and has a constant shift of 1.40 MHz/G [22,23], while all other transitions experiences various changes.…”

Section: Resultsmentioning

confidence: 99%

Circular dichroism in atomic vapors: magnetically induced transitions responsible for two distinct behaviors

Sargsyan,

Amiryan,

Tonoyan

et al. 2020

Preprint

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Atomic transitions of alkali metals for which the condition F e − F g = ±2 is satisfied have null probability in a zero magnetic field, while a giant increase can occur when an external field is applied. Such transitions, often referred to as magnetically-induced (MI) transitions, have received interest because their high probabilities in wide ranges of external magnetic fields which, in some cases, are even higher than that of usual atomic transitions. Previously, the following rule was established: the intensities of MI transitions with ∆F = ±2 are maximum when using respectively σ ± radiation. Within the same ground state, the difference in intensity for σ + and σ − radiations can be significant, leading to magnetically induced circular dichroism (MCD), referred to as type-1. Here, we show that even among the strongest MI transitions, i.e originating from different ground states for σ + and σ − , the probability of MI transition with ∆F = +2 is always greater, which leads to another type of MCD. Our experiments are performed with a Cs-filled nanocell, where the laser is tuned around the D 2 line; similar results are expected with other alkali metals. Theoretical calculations are in excellent agreement with the experimental measurements.

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Section: Resultsmentioning

confidence: 99%

Circular dichroism in atomic vapors: magnetically induced transitions responsible for two distinct behaviors

Sargsyan,

Amiryan,

Tonoyan

et al. 2020

Preprint

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“…Their dipole moments represent an asymptotic value for the rest of transitions in the given group; for the case of the D 2 -line such "guiding" transitions are missing (theoretical explanation is given in [10]); 3) in both cases the remaining 20 transitions for B @ B 0 rearrange into two large groups containing 10 transitions each; however for the D 1 -line this rearrangement takes place at a weaker magnetic field (~3 kG); 4) spectra of both the D 1 -and D 2 -lines for B @ B 0 contain four transitions (two for 85 Rb and two for 87 Rb) which are forbidden for B = 0 but gain significant probabilities in the strong magnetic field; 5) the transition frequencies for the D 1 -line case may be obtained using the Rabi−Breit equations [2,3]; the D 2 -line case requires more complex calculations [19,20]; 6) in the 87 Rb D 1 -line spectrum for B = 7 kG the frequency difference between the extreme lateral transitions labeled 1' and 8' reaches ≈18 GHz while in the D 2 -line spectrum this difference is significantly smaller, ≈12 GHz (the reason for this is the larger, ±0.94 MHz, difference in the frequency slopes for the D 1 -line). A simple device consisting of a Cs-filled micro-cell between two strong magnets has been suggested in [23]. The whole device, which is attached to a single holder, is a convenient frequency reference because its transmission spectrum contains strongly shifted and spectrally narrow lines.…”

Section: Discussionmentioning

confidence: 99%

Study of the Rb D 2-line splitting in a strong transverse magnetic field with Doppler-free spectroscopy in a nanocell

et al. 2015

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Atomic transitions of 85 Rb and 87 Rb isotopes in a strong transverse magnetic field with induction of up to 7 kG have been studied experimentally. High spectral resolution is achieved owing to the application of the linear Doppler-free spectroscopy method to a nanometric thin cell with the thickness of L = λ/2 = 390 nm, where λ is the wavelength of laser emission tuned to the resonance with the Rb D 2 -line (λ/2-method). It has been observed that the number of atomic transitions in the transmission spectrum of linearly polarized (π) radiation decreases from 64 down to 20 transitions as the field strength increases above B > 5 kG. Four atomic transitions (two of 85 Rb and two of 87 Rb), which are forbidden in the absence of magnetic field, acquire significant strength in the strong magnetic field. Experimental results are in a good agreement with theory. Several practical applications of alkali-vapor-filled nanometric thin cells have been proposed.

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“…Since manufacturing of this type of MTC also can cause some technical difficulties, the construction was presented in Fig. 2 in paper [19]. Such cells can be easily manufactured in many laboratories.…”

Section: Micrometric Thick 39 K Vapor Cellmentioning

confidence: 99%

Saturated absorption technique used in Potassium microcell for magnetic field sensing

Sargsyan,

Momier,

Leroy

et al. 2022

Preprint

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It is demonstrated that the use of a Micrometric Thin 39 K vapor Cell (MTC) and Saturated Absorption spectroscopy (SA) allows to form narrow atomic lines in transmission spectrum without unwanted Cross-Over (CO) resonances. Another important feature is the small characteristic magnetic field value B 0 = A hf /µ B of 39 K, significantly smaller than for Rb and Cs. As a consequence, decoupling of J and I can be observed at relatively low magnetic fields ∼300 G, which results in the formation of two groups of four well-spectrally-resolved and equidistantlypositioned atomic transitions having the same amplitude (each group corresponds to a given circular polarization σ ± ) which we record using a simple experimental setup with a linearly polarized tunable diode-laser and a longitudinal magnetic field obtained with two permanent magnets. Fabrication of a MTC is much easier than the fabrication of the 39 K nanocells used in our previous works. A simple method to determine the magnitude of a wide range of B-fields with a spatial resolution of 30 µm is presented, which is intrinsically calibrated and does not require a frequency reference.

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Micron-thick spectroscopic cells for studying the Paschen-Back regime on the hyperfine structure of cesium atoms

Cited by 20 publications

References 23 publications

Circular dichroism in atomic vapors: magnetically induced transitions responsible for two distinct behaviors

Circular dichroism in atomic vapors: magnetically induced transitions responsible for two distinct behaviors

Study of the Rb D 2-line splitting in a strong transverse magnetic field with Doppler-free spectroscopy in a nanocell

Saturated absorption technique used in Potassium microcell for magnetic field sensing

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