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International Conference Laser Optics (ICLO)

Optical properties of optically dense medium of alkali atoms having a nonzero temperature under conditions of coherent population trapping resonance detected by the Ramsey method

Г. В. Волошин, A. N. Litvinov, К. А. Баранцев, A. S. Kuraptsev

Published Jun 20, 2022• 0 citations
Publisher

Abstract

A mathematical model of the interaction of bichromatic pulsed laser radiation with an optically dense medium of alkali atoms at a nonzero temperature is constructed. A numerical scheme for solving the obtained integro-differential equations is proposed. The results of the solution are analyzed for the dependence of the shape and shifts of the obtained two-photon resonances on temperature.

DOI
10.1109/iclo54117.2022.9840218

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A mathematical model of the interaction of bichromatic pulsed laser radiation with an optically dense medium of alkali atoms at a nonzero temperature is constructed. A numerical scheme for solving the obtained integro-differential equations is proposed. The results of the solution are analyzed for the dependence of the shape and shifts of the obtained two-photon resonances on temperature.
This work is devoted to a theoretical investigation of the Ramsey method of detection of the coherent population trapping resonance in cold atomic clouds taking into account collective effects caused by finite optical depth of the considered clouds. The interaction of atoms with pulsed laser radiation is described in the formalism of density matrix by means of Maxwell-Bloch set of equations. The Ramsey signal of coherent population trapping resonance was calculated for the radiation passed through the medium and analyzed for different length of the atomic cloud. Also the population of excited level was calculated in dependence on the two-photon detuning and coordinate along the main optical axis. The light shift of sidebands and appearance of additional harmonics were discovered.
Abstract We report on a theoretical model of the effect of coherent population trapping in alkali atoms in an optically thin gas cell with a buffer gas at a nonzero temperature in a pulsed laser field. The shape of the Ramsey resonance is analysed for two different temperature ranges, i. e. for a ‘cold’ atomic ensemble and for an ensemble of ‘hot’ atoms in a cell with a buffer gas. The influence of the hyperfine structure of the excited level on the shift of the central Ramsey resonance is investigated.
Abstract A theory is developed for the effect of coherent population trapping (CPT) in ‘hot’ atoms under pulsed pumping in an optically dense medium with a buffer gas. The case is considered when the excited level is not degenerate. Based on an analysis of the shape of Ramsey resonances, we show that with increasing optical density of the medium, the dependence of the light shifts of the CPT resonance becomes more and more nontrivial. The dependence of the light shifts of the CPT resonance on the magnitude of the hyperfine splitting of the excited level, concentration of active atoms, temperature, and duration of the dark pause is constructed.