Spatial dynamics of laser-induced fluorescence in an intense laser beam: An experimental and theoretical study with alkali-metal atoms

Auzinsh, M.; Bērziņš, A.; Ferber, R.; Gahbauer, F.; Kalnins, U.

doi:10.1103/physreva.93.033403

Cited by 3 publications

(3 citation statements)

References 28 publications

(30 reference statements)

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“…In the calculation the transit relaxation was assumed to be the same for both processes: pumping and probing. The reduced Rabi frequency of the pump beam was estimated as [20]…”

Section: Theoretical Modelmentioning

confidence: 99%

“…The estimation of γ follows the relationship described in equation (7). Because the laser intensity is not constant across the diameter of the pump laser beam, the influence of Rabi frequency and transit relaxation rate is complex [20]. Keeping this in mind, we allowed γ to vary from the definition in equation (7).…”

Section: Experimentally Observed Absorption Signals and Analysismentioning

confidence: 99%

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Searching for alignment-to-orientation conversion in the ground state of atomic Cs with circularly polarized laser probe

Mozers

Busaite²,

Osite³

et al. 2023

J. Phys. B: At. Mol. Opt. Phys.

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In this study we explored the possibilities for observing the angular momentum alignment-to-orientation conversion (AOC) in the ground state of various alkali metals: K, Rb, Cs. For theoretical analysis we used a model that is based on the Optical Bloch equations for the density matrix. In our model we took into account the interaction of the laser light with all hyperfine levels, which are mixed as the magnetic field increases. The radiation's coherence properties were also included. Finally, the results were averaged over the Doppler profile. Additionally we simulated signals where the ground- or the excited-state coherent processes were numerically switched off in order to determine the origins of the features of the obtained signals. We also performed experiments on Cs atoms with two laser beams: a linearly polarized Cs D1 pump and circularly polarized Cs D2 probe. We used the pump beam to create angular momentum alignment in the ground state and observed the transmission signal of the probe beam as we changed the magnetic field. A detailed analysis of the experimentally obtained transmission signal from a single circularly polarized probe laser component is provided. Finally, prospects for observing AOC experimentally are discussed, as well as experiments were even a weak AOC signal could lead to systematic errors.

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“…In the calculation the transit relaxation was assumed to be the same for both processes: pumping and probing. The reduced Rabi frequency of the pump beam was estimated as [20]…”

Section: Theoretical Modelmentioning

confidence: 99%

Section: Experimentally Observed Absorption Signals and Analysismentioning

confidence: 99%

Searching for alignment-to-orientation conversion in the ground state of atomic Cs with circularly polarized laser probe

Mozers

Busaite²,

Osite³

et al. 2023

J. Phys. B: At. Mol. Opt. Phys.

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show abstract

“…This happens because the theoretical model does not take into account the spatial distribution of the exciting optical field. The influence of different laser power density in different spatial positions on the fluorescence signal that causes the atoms to interact differently with the laser beam has been studied in [35].…”

Section: Red)mentioning

confidence: 99%

Angular momentum alignment-to-orientation conversion in the ground state of Rb atoms at room temperature

Mozers,

Busaite,

Osite

et al. 2020

Preprint

Self Cite

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We investigated experimentally and theoretically angular momentum alignment-to-orientation conversion created by the joint interaction of laser radiation and an external magnetic field with atomic rubidium at room temperature. In particular we were interested in alignment-to-orientation conversion in atomic ground state. Experimentally the laser frequency was fixed to the hyperfine transitions of D1 line of rubidium. We used a theoretical model for signal simulations that takes into account all neighboring hyperfine levels, the mixing of magnetic sublevels in an external magnetic field, the coherence properties of the exciting laser radiation, and the Doppler effect. The experiments were carried out by exciting the atoms with linearly polarized laser radiation. Two oppositely circularly polarized laser induced fluorescence (LIF) components were detected and afterwards their difference was taken. The combined LIF signals originating from the hyperfine magnetic sublevel transitions of 85 Rb and 87 Rb rubidium isotopes were included. The alignment-to-orientation conversion can be undoubtedly identified in the difference signals for various laser frequencies as well as change in signal shapes can be observed when the laser power density is increased. We studied the formation and the underlying physical processes of the observed signal of the LIF components and their difference by performing the analysis of the influence of incoherent and coherent effects. We performed simulations of theoretical signals that showed the influence of ground-state coherent effects on the LIF difference signal.

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Angular momentum alignment-to-orientation conversion in the ground state of Rb atoms at room temperature

et al. 2020

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Spatial dynamics of laser-induced fluorescence in an intense laser beam: An experimental and theoretical study with alkali-metal atoms

Cited by 3 publications

References 28 publications

Searching for alignment-to-orientation conversion in the ground state of atomic Cs with circularly polarized laser probe

Searching for alignment-to-orientation conversion in the ground state of atomic Cs with circularly polarized laser probe

Angular momentum alignment-to-orientation conversion in the ground state of Rb atoms at room temperature

Angular momentum alignment-to-orientation conversion in the ground state of Rb atoms at room temperature

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