Influence of temperature on the shape of Ramsey resonances detected in an optically dense medium

Abstract

In the course of this work, a semiclassical model for the interaction of pulsed laser radiation with an optically dense medium of alkali atoms under conditions of coherent population trapping resonance was developed. To describe the state of the atomic ensemble the density matrix method was used, which makes it possible to correctly take into account relaxation processes.
In the process of creating a dynamic mathematical model, the optical density of the medium, the hyperfine splitting of the excited state of the atom (four-level model), as well a nonzero temperature of the atomic ensemble, leading to significant changes in the shape of the resonance of coherent population trapping, were taken into account.
A modification of the Euler method was proposed to implement the numerical solution of the systems of the obtained equations. As a result of the solution, it was shown that the hyperfine splitting of the excited state of the atom leads to a light shift of the resonance detected by the Ramsey method. The analysis of the behavior of the light shift depending on various parameters of the atomic medium and incident two-frequency radiation is carried out.

Speaker

Gavriil Voloshin
Student of SPbPU, Higher school of applied physics and space technologies
Russia

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