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Оптика и спектроскопия

Influence of collisions on the effect of electromagnetic-induced transparency in cells of finite sizes with anti-relaxation coating of walls

Г. В. Волошин

Published Jan 1, 2023• 0 citations
Publisher

Abstract

Based on the semiclassical theory of the interaction of two-frequency laser radiation with a resonant atomic medium, an analytical expression is obtained that describes the form of resonances of electromagnetically induced transparency detected in a cell with a finite direction in the longitudinal laser beam direction with an anti-relaxation coating of walls, taking into account the motion of atoms and collisions with walls. The following types of reflection from walls are considered: diffuse, specular, and specular-incoherent. It is found that in a number of cases the diffuse type of reflection exhibits the properties of a mirror-incoherent one. It is also shown that the nondegeneracy of the excited state in a number of cases significantly changes the shape of the transparency resonance. Keywords: Electromagnetically induced transparency, Gas cell, anti-relaxation coating, diffuse reflection, specular reflection, specular-incoherent reflection.

DOI
10.21883/eos.2023.01.55516.4164-22

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Journal of Experimental and Theoretical Physics•Feb 1, 2023•4 citations
Based on the semiclassical theory of the interaction of two-frequency laser radiation with a resonant atomic medium, an analytical expression is obtained that describes the form of resonances of electromagnetically induced transparency detected in a cell with a finite direction in the longitudinal laser beam direction with an anti-relaxation coating of walls, taking into account the motion of atoms and collisions with walls. The following types of reflection from walls are considered: diffuse, specular, and specular-incoherent. It is found that in a number of cases the diffuse type of reflection exhibits the properties of a mirror-incoherent one. It is also shown that the nondegeneracy of the excited state in a number of cases significantly changes the shape of the transparency resonance. Keywords: Electromagnetically induced transparency, Gas cell, anti-relaxation coating, diffuse reflection, specular reflection, specular-incoherent reflection.
Based on the semiclassical theory of the interaction of two-frequency laser radiation with a resonant atomic medium, an analytical expression is obtained that describes the form of resonances of electromagnetically induced transparency detected in a cell with a finite direction in the longitudinal laser beam direction with an anti-relaxation coating of walls, taking into account the motion of atoms and collisions with walls. The following types of reflection from walls are considered: diffuse, specular, and specular-incoherent. It is found that in a number of cases the diffuse type of reflection exhibits the properties of a mirror-incoherent one. It is also shown that the nondegeneracy of the excited state in a number of cases significantly changes the shape of the transparency resonance.
Abstract The dependence of the nature of electromagnetically induced transparency (EIT) in gas cells without a buffer gas on the quality of the antirelaxation coating of the walls, i.e., on the probability of relaxation of the internal state of an atom upon collision with this coating, is analyzed. It is found that, in a number of practically important cases, relaxation on the walls has little effect on the contrast of the EIT resonance, and, under certain conditions, even enhances this effect. For a nondegenerate ground state of atoms, the significant difference is analyzed between two schemes for the implementation of EIT in the cases of Stokes and anti-Stokes scattering of probe radiation, as well as between two types of reflection, specular (elastic) and diffuse, when the atom velocity after reflection does not depend on the velocity before the collision but is determined by the wall temperature. Particular attention is paid to the features of the EIT spectra when the nondegeneracy of the excited state of atoms is taken into account.
In this paper, we propose an approach that makes it possible to obtain an analytical expression of the spectral dependence of the resonance of electromagnetically induced transparency detected by bichromatic radiation in a cell of finite size in the longitudinal direction of the laser beam. Specular and diffuse reflections of atoms from walls are considered. It was found that a significant difference between these types of reflections takes place only for cells of small longitudinal dimensions compared to the splitting wavelength of the ground state of atoms. A physical explanation is proposed for the difference between the Stokes and anti-Stokes scattering channels of probe radiation in terms of dressed states.
Abstract The features of electromagnetically induced transparency (EIT) in gas cells with antirelaxation coating of the walls are considered. It is shown that the simultaneous effect of the motion of atoms, the finite size of a cell, and the nondegeneracy of the ground state of atoms leads to a number of qualitative phenomena. In particular, even for the simplest three-level lambda scheme with a nondegenerate ground state, a significant difference in the spectra of EIT is revealed and investigated in detail depending on the relation between the frequencies of the probe and control fields, i.e., depending on whether the probe radiation is scattered in the Stokes or anti-Stokes channel. A significant spatial inhomogeneity of the excited low-frequency coherence is observed, which persists for large cells even far from their boundaries. In this case, the EIT resonances formed by atoms in different regions of a cell turn out to be differently shifted in frequency, which causes an additional inhomogeneous broadening of the observed profile. The observed effects are studied as a function of the nature of the accommodation of atoms on the surface of the antirelaxation coating.
We consider the motion of atoms in a cell free of a buffer gas with an antirelaxation wall coating on the spectrum and shift of the coherent population trapping resonance. We compare two types of reflection of atoms, viz., elastic (specular) and diffuse reflection, when the velocity of an atom after its reflection is determined by the wall temperature, as well by the quality of the antirelaxation wall coating. It is shown that for both types of reflection, a nonmonotonic dependence of the coherent population trapping resonance shift on the cell size is observed. In the case of diffuse reflection, the shift can change sign, and a complex two-hump structure of the coherent population trapping resonance is observed in a certain range of cell lengths. The dependence of the detected effects on the laser radiation spectral width is analyzed.
Abstract We consider the motion of atoms in a cell free of a buffer gas with an antirelaxation wall coating on the spectrum and shift of the coherent population trapping resonance. We compare two types of reflection of atoms, viz., elastic (specular) and diffuse reflection, when the velocity of an atom after its reflection is determined by the wall temperature, as well by the quality of the antirelaxation wall coating. It is shown that for both types of reflection, a nonmonotonic dependence of the coherent population trapping resonance shift on the cell size is observed. In the case of diffuse reflection, the shift can change sign, and a complex two-hump structure of the coherent population trapping resonance is observed in a certain range of cell lengths. The dependence of the detected effects on the laser radiation spectral width is analyzed.