Effects of inhomogeneous line broadening on electromagnetically induced transparency (EIT) and slow group velocity

Abstract

We show for the first time an explicit expression of the linewidth of an EIT resonance in an inhomogeneously broadened three-level A system, and the conditions for the dependence of the linewidth on a driving field strength.Both gaseous systems with the Doppler effect and solid media in which inhomogeneity of the crystalline fields results in a broad distribution of atomic center frequencies are considered. We find two extreme cases: in one extreme the linewidth of EIT resonance is proportional to the intensity of a drive laser. And in the other it is proportional to the Rabi frequency of a drive laser, which recovers the result obtained by Feld and Javan. The dispersive properties of EIT, leading to slow group velocity of light, in an inhomogeneously broadened system are also considered.

Selective Elimination of Homogeneous Broadening by Multidimensional Spectroscopy in the Electromagnetically Induced Transparency Regime

“…More elaborate cases, when the finite inhomogeneous bandwidth has to be taken into account explicitly, have been considered in the context of EIT. Several limiting cases have been identified to reduce the effects of inhomogeneous broadening . It has been further shown that the V-scheme is less vulnerable, while control field strength is a crucial factor in maintaining the controllable bandwidths of the EIT resonances.…”

“…Several limiting cases have been identified to reduce the effects of inhomogeneous broadening. 31 It has been further shown that the V-scheme is less vulnerable, 32 while control field strength is a crucial factor 33 in maintaining the controllable bandwidths of the EIT resonances. While larger inhomogeneous broadening is rather detrimental in the case of the pure frequency domain experiments, such as EIT, it it is more prone to benefit pure time-domain photon echo experiments.…”