Influence of atomic diffusion on the shape of electromagnetically induced transparency resonance in a gas cell with a buffer gas
Phys. Rev. A 113, 043507 – Published 7 April, 2026
DOI: https://doi.org/10.1103/897w-fjyp
Abstract
In this work we investigate the influence of atomic diffusion effects on the resonance of electromagnetically induced transparency (EIT) in gas cells filled with three-level atoms and a buffer gas. The influence of the end walls and diffusion of atoms at the wavelength of laser field beats is studied. Analytical expressions are obtained for the local absorption coefficient of the probe field and for the full absorption spectrum of the gas cell. It is shown that the diffusion contribution to the EIT resonance linewidth can be suppressed near the walls. It was found that the influence of end walls can lead to both inhomogeneous broadening and narrowing of the EIT line. This can be controlled by changing the intensity of the control field. The dispersion characteristics of the medium were analyzed. Expressions for the group velocity and group delay were obtained, and it is shown that under certain conditions the influence of the walls leads to an increase in the group delay.
