Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Journal of Physics Conference Series

Influence of spontaneous emission transfer on the resonances of interaction of laser radiation with alkali atoms confined in an extremely thin cell

G. Todorov, Vladimir A. Polischuk, A. Krasteva, Armen D. Sargsyan, S. Cartaleva, T. A. Vartanyan

Published Feb 1, 2017• 0 citations
Publisher

Abstract

The nonlinear absorption and fluorescence spectra of 133 Cs vapours confined to the extremely thin cell are computed in the framework of perturbation theory regarding to the intensity of the laser light illumination. The amplitude as well as the sign of the longitudinal alignment of the ground state is shown to be defined by the spontaneous decay of the upper level. The sign and the magnitude of the nonlinear absorption resonance on the closed optical transition are shown to be defined by this process as well.

DOI
10.1088/1742-6596/810/1/012040

Related papers

Nonlinear resonances sign reversal and longitudinal alignment on the resonant levels of133Cs thin-layer vapour

G. Todorov, Vladimir A. Polischuk, A. Krasteva +3 more

The fluorescence and non-linear absorption spectra of Cs133 vapour in an extremely thin cell were calculated by using the perturbation theory with respect to the pumping field intensity. The problem of the atoms’ non-linear polarization was solved for arbitrary values of the total momenta of the resonance levels pumped by a linearly-polarised laser field. It was demonstrated that the spontaneous emission from the upper level affects the amplitude and sign of the lower level longitudinal alignment and results in a change of the amplitude and sign of the non-linear absorption resonance at the closed transition. The comparison of the numerical calculations with the experimental data for the D2 line of 133Cs shows a very good agreement.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Jan 5, 2017•0 citations

Temperature and excitation power influence on the velocity-selective optical pumping resonances of 133Cs atoms confined in an extremely thin cell

T. A. Vartanyan, В. А. Полищук, Armen D. Sargsyan +3 more

Linear and nonlinear absorption spectra of 133 Cs vapor confined in an extremely thin cell were computed via iterations with respect to the resonance radiation intensity. When the incident radiation intensity is low, the transient polarization of the atoms that undergo frequent collisions with the cell walls leads to sub-Doppler features in the absorption spectra. Higher incident radiation intensities result in the appearance of velocity-selective optical pumping resonances. The theory developed agrees quantitatively with the experimental findings.

Journal of Physics Conference Series•Mar 1, 2018•0 citations

Ground-state magneto-optical resonances in cesium vapor confined in an extremely thin cell

C. Andreeva, Aigars Atvars, Marcis P. Auzinsh +4 more

Experimental and theoretical studies are presented related to the ground-state magneto-optical resonance observed in cesium vapor confined in an extremely thin cell (ETC), with thickness equal to the wavelength of the irradiating light. It is shown that utilization of the ETC allows one to examine the formation of a magneto-optical resonance on the individual hyperfine transitions, thus distinguishing processes resulting in dark (reduced absorption) or bright (enhanced absorption) resonance formation. We report experimental evidence of bright magneto-optical resonance sign reversal in Cs atoms confined in an ETC. A theoretical model is proposed based on the optical Bloch equations that involves the elastic interaction processes of atoms in the ETC with its walls, resulting in depolarization of the Cs excited state, which is polarized by the exciting radiation. This depolarization leads to the sign reversal of the bright resonance. Using the proposed model, the magneto-optical resonance amplitude and width as a function of laser power are calculated and compared with the experimental ones. The numerical results are in good agreement with those of experiment.

arXiv:0704.3010•Physical Review A•Dec 10, 2007•17 citations

Bright magneto-optical resonance sign reversal in Cs vapour confined in an extremely thin cell

Aigars Atvars, Marcis P. Auzinsh, Kristaps Bluss +5 more

An extremely thin cell (ETC) was used to analyse ground state effects of Cs atoms excited by laser light and placed in a magnetic field that was scanned around zero. The advantage of using the ETC is the possibility to separate the hf transitions, which are overlapped in ordinary cells, as a result of the spatial anisotropy of the atom-light interaction. Cs atoms were irradiated by circularly/linearly polarized light at lambda~852 nm, and the dependence of absorption on the external magnetic field was measured.

Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)•Jun 1, 2007•0 citations

Calculation of the nonlinear interaction between a laser beam and alkali-metal atomic vapor in an ultrathin cell

G. Todorov, В. А. Полищук, A. Krasteva +3 more

We calculate the fluorescence and nonlinear absorption spectra of alkali-metal atomic vapor in ultrathin cells. We obtain closed-form equations for the nonlinear atomic polarization by applying perturbation theory to the intensity of linearly polarized laser light for arbitrary values of the total momenta of the resonant levels. The results of this calculation are consistent with experimental data obtained using an ultrathin cell filled with Cs133 vapor.

Journal of Optical Technology•Nov 1, 2016•3 citations

New narrow resonance in the fluorescence of closed optical transition observed in nanometric Cs-vapor layers

S. Cartaleva, Armen D. Sargsyan, David G. Sarkisyan +2 more

In this communication we report the first observation of a narrow, reduced fluorescence dip in the profile of the completely closed transition on the D2 line of 133Cs vapor, confined in Extremely Thin Cell with nanometric thickness. The theoretical modeling of the fluorescence based on the Optical Bloch Equation for two-level atomic system, shows that the narrow dip in the fluorescence could be attributed to a very small loss in the excitation process of the examined degenerate transition. While the population in the atomic system remains constant, the depolarization of the excited level can lead to some loss in the efficiency of the optical transition excitation. Under the conditions of our experiment, no dip in the fluorescence is registered for the cell thickness where a well pronounced Dicke peak in the absorption takes place. For the cells with nanometric thickness, the previous investigations demonstrate that the fluorescence profiles of optical transitions differ significantly from the absorption profiles. However, our experiment shows that some traces of the coherent Dicke process contributing to the absorption line still remain in the fluorescence, which is result of non-coherent processes.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Oct 8, 2010•4 citations
The nonlinear absorption and fluorescence spectra of 133 Cs vapours confined to the extremely thin cell are computed in the framework of perturbation theory regarding to the intensity of the laser light illumination. The amplitude as well as the sign of the longitudinal alignment of the ground state is shown to be defined by the spontaneous decay of the upper level. The sign and the magnitude of the nonlinear absorption resonance on the closed optical transition are shown to be defined by this process as well.
The fluorescence and non-linear absorption spectra of Cs133 vapour in an extremely thin cell were calculated by using the perturbation theory with respect to the pumping field intensity. The problem of the atoms’ non-linear polarization was solved for arbitrary values of the total momenta of the resonance levels pumped by a linearly-polarised laser field. It was demonstrated that the spontaneous emission from the upper level affects the amplitude and sign of the lower level longitudinal alignment and results in a change of the amplitude and sign of the non-linear absorption resonance at the closed transition. The comparison of the numerical calculations with the experimental data for the D2 line of 133Cs shows a very good agreement.
Linear and nonlinear absorption spectra of 133 Cs vapor confined in an extremely thin cell were computed via iterations with respect to the resonance radiation intensity. When the incident radiation intensity is low, the transient polarization of the atoms that undergo frequent collisions with the cell walls leads to sub-Doppler features in the absorption spectra. Higher incident radiation intensities result in the appearance of velocity-selective optical pumping resonances. The theory developed agrees quantitatively with the experimental findings.
Experimental and theoretical studies are presented related to the ground-state magneto-optical resonance observed in cesium vapor confined in an extremely thin cell (ETC), with thickness equal to the wavelength of the irradiating light. It is shown that utilization of the ETC allows one to examine the formation of a magneto-optical resonance on the individual hyperfine transitions, thus distinguishing processes resulting in dark (reduced absorption) or bright (enhanced absorption) resonance formation. We report experimental evidence of bright magneto-optical resonance sign reversal in Cs atoms confined in an ETC. A theoretical model is proposed based on the optical Bloch equations that involves the elastic interaction processes of atoms in the ETC with its walls, resulting in depolarization of the Cs excited state, which is polarized by the exciting radiation. This depolarization leads to the sign reversal of the bright resonance. Using the proposed model, the magneto-optical resonance amplitude and width as a function of laser power are calculated and compared with the experimental ones. The numerical results are in good agreement with those of experiment.
An extremely thin cell (ETC) was used to analyse ground state effects of Cs atoms excited by laser light and placed in a magnetic field that was scanned around zero. The advantage of using the ETC is the possibility to separate the hf transitions, which are overlapped in ordinary cells, as a result of the spatial anisotropy of the atom-light interaction. Cs atoms were irradiated by circularly/linearly polarized light at lambda~852 nm, and the dependence of absorption on the external magnetic field was measured.
In this communication we report the first observation of a narrow, reduced fluorescence dip in the profile of the completely closed transition on the D2 line of 133Cs vapor, confined in Extremely Thin Cell with nanometric thickness. The theoretical modeling of the fluorescence based on the Optical Bloch Equation for two-level atomic system, shows that the narrow dip in the fluorescence could be attributed to a very small loss in the excitation process of the examined degenerate transition. While the population in the atomic system remains constant, the depolarization of the excited level can lead to some loss in the efficiency of the optical transition excitation. Under the conditions of our experiment, no dip in the fluorescence is registered for the cell thickness where a well pronounced Dicke peak in the absorption takes place. For the cells with nanometric thickness, the previous investigations demonstrate that the fluorescence profiles of optical transitions differ significantly from the absorption profiles. However, our experiment shows that some traces of the coherent Dicke process contributing to the absorption line still remain in the fluorescence, which is result of non-coherent processes.