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Magneto-optical resonances at the D2 line of Rb in a hot Cs buffer gas confined in a micrometric thickness optical cell

Христина Андреева, Emilia A. Alipieva, Санка Гатева, Elena T. Taskova, Аспарух Марковски, Николай Петров, Petko Todorov, Стоян Цветков, Zara Kasapeteva

Published Oct 6, 2024• 0 citations
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Abstract

Ground-state level-crossing magneto-optical resonances are registered at the D2 line of 85Rb atoms as a small admixture in a 700 μm thick cell filled with Cs atoms. The signals of the Rb atoms in a “buffer gas” of hot Cs atoms are compared with the signals from atoms without hot “buffer gas” (the thermal Cs atoms in the 700 μm cell and a nanometric cell). Our results show that the Rb particles show an intermediate behavior between these two cases under such conditions. This is explained based on adequate confinement size determined by the polarization relaxation of the Rb atoms by spinexchange collisions with the high-density Cs atoms. The possibility of realizing such temperature-controlled variation of the effective confinement size can be of interest for investigating collisions between different alkali atoms and the formation of dimers under the conditions of one-dimensional confinement.

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Ground-state level-crossing magneto-optical resonances are registered at the D2 line of 85Rb atoms as a small admixture in a 700 µm thick cell filled with Cs atoms. The signals of the Rb atoms in a “buffer gas” of hot Cs atoms are compared with the signals from atoms without hot “buffer gas” (the thermal Cs atoms in the 700 µm cell and a nanometric cell). Our results show that the Rb particles show an intermediate behavior between these two cases under such conditions. This is explained based on adequate confinement size determined by the polarization relaxation of the Rb atoms by spin-exchange collisions with the high-density Cs atoms. The possibility of realizing such temperature-controlled variation of the effective confinement size can be of interest for investigating collisions between different alkali atoms and the formation of dimers under the conditions of one-dimensional confinement.

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In this article, we present the concept of an optical scalar magnetometer based on the spectroscopy of hot alkali vapors confined in nanometric-thick cells. We present an appropriate theoretical model to describe the interaction of linearly and circularly polarized light with atomic alkali vapors confined in extremely thin cells where a longitudinal magnetic field is applied. This model can be used to perform consecutive fittings of experimental spectra recorded by derivative selective reflection method, in order to measure the value of magnetic field. We illustrate the model with various calculated spectra for natural Rb vapor, while equivalent results hold for other alkalis (Na, K, Cs). We analyze the feasibility of the concept for different cases depending on light polarization and cell thickness, and discuss possible limitations of the technique.

Journal of Contemporary Physics (Armenian Academy of Sciences)•Oct 1, 2018•4 citations
Ground-state level-crossing magneto-optical resonances are registered at the D2 line of 85Rb atoms as a small admixture in a 700 μm thick cell filled with Cs atoms. The signals of the Rb atoms in a “buffer gas” of hot Cs atoms are compared with the signals from atoms without hot “buffer gas” (the thermal Cs atoms in the 700 μm cell and a nanometric cell). Our results show that the Rb particles show an intermediate behavior between these two cases under such conditions. This is explained based on adequate confinement size determined by the polarization relaxation of the Rb atoms by spinexchange collisions with the high-density Cs atoms. The possibility of realizing such temperature-controlled variation of the effective confinement size can be of interest for investigating collisions between different alkali atoms and the formation of dimers under the conditions of one-dimensional confinement.
Ground-state level-crossing magneto-optical resonances are registered at the D2 line of 85Rb atoms as a small admixture in a 700 µm thick cell filled with Cs atoms. The signals of the Rb atoms in a “buffer gas” of hot Cs atoms are compared with the signals from atoms without hot “buffer gas” (the thermal Cs atoms in the 700 µm cell and a nanometric cell). Our results show that the Rb particles show an intermediate behavior between these two cases under such conditions. This is explained based on adequate confinement size determined by the polarization relaxation of the Rb atoms by spin-exchange collisions with the high-density Cs atoms. The possibility of realizing such temperature-controlled variation of the effective confinement size can be of interest for investigating collisions between different alkali atoms and the formation of dimers under the conditions of one-dimensional confinement.
We propose a novel use of an optical cell of micrometer thickness filled with Cs vapor in view of studying the collisions between two different alkali atoms of strongly different densities. We demonstrate narrow and good-contrast sub-Doppler resonances at the Rb D 2 line for a mean-free-path of the Cs atoms comparable to the optical cell longitudinal dimension; the resonances are completely destroyed when the mean-free-path of the Cs atoms is more than two orders of magnitude shorter than the longitudinal dimension of the thin cell.
N-type resonances excited in rubidium atoms confined in micrometric-thin cells with variable thickness from 1 μm to 2 mm are studied experimentally for the cases of a pure Rb atomic vapor and of a vapor with neon buffer gas. Good contrast and narrow linewidth were obtained for thicknesses as low as 30 μm. The higher amplitude and sharper profile of N-type resonances in the case of a buffered cell was exploited to study the splitting of the 85Rb D1 N-resonance in a magnetic field of up to 2200 G. The results are fully consistent with the theory. The mechanism responsible for forming N-resonances is discussed. Possible applications are addressed.
We present the first experimental observation of narrow dips in the fluorescence profiles of completely closed hyperfine transitions in Rb vapor at high atomic density, which is attributed to the depolarization of the excited state.Moreover, at low atomic density, a narrow peak on the top of the fluorescence profile is demonstrated, centered at the completely closed transition within the D2 line of Cs.Experiments are performed in thin (700 µm) alkali cell by single light beam spectroscopy.The cell is filled with Cs containing a small portion of Rb.
Recently developed thin cells containing atomic vapor of micrometric column thickness L allow one to study peculiarities of Electromagnetically Induced Transparency (EIT) phenomenon, along with the accompanying velocity selective optical pumping/saturation (VSOP) resonances for the case when < 100 &mgr;m. The micrometric thin cells (MTC) are filled with pure Rb and neither buffer gas nor paraffin-coated walls were used. The Λ-systems on D2 line of 85Rb have been studied experimentally with the use of bi-chromatic radiation of two separate diode lasers (λ≈780 nm, γL&≈ 5MHz). It is demonstrated that when L~60 &mgr;m it is still possible to form the EIT resonance with the sub-natural linewidth ~ 5 MHz. The EIT resonance linewidth increases up to 10 MHz , when column thickness L is reduced down to ~ 2 &mgr;m. Six VSOP resonances are detected in the fluorescence and absorption spectra when the thickness L ~ 10 &mgr;m. Dependence of the EIT resonance linewidth as a function of the atomic vapor column thickness L is presented.
In this article, we present the concept of an optical scalar magnetometer based on the spectroscopy of hot alkali vapors confined in nanometric-thick cells. We present an appropriate theoretical model to describe the interaction of linearly and circularly polarized light with atomic alkali vapors confined in extremely thin cells where a longitudinal magnetic field is applied. This model can be used to perform consecutive fittings of experimental spectra recorded by derivative selective reflection method, in order to measure the value of magnetic field. We illustrate the model with various calculated spectra for natural Rb vapor, while equivalent results hold for other alkalis (Na, K, Cs). We analyze the feasibility of the concept for different cases depending on light polarization and cell thickness, and discuss possible limitations of the technique.