Electromagnetically induced transparency with degenerate atomic levels

TL;DR

This paper derives a general expression for the susceptibility tensor in -type three-level atomic systems under electromagnetically induced transparency, analyzing how polarization affects group velocity differences.

Contribution

It provides a comprehensive, ready-to-use formula for susceptibility in degenerate atomic levels with arbitrary polarization and angular momenta, advancing theoretical understanding of EIT.

Findings

Susceptibility tensor expression for arbitrary polarization derived

Dependence of group velocity difference on coupling field polarization analyzed

Results applicable to various atomic configurations and experimental setups

Abstract

For the coherently driven \Lambda-type three-level systems the general ready-to-calculate expression for the susceptibility tensor at the frequency of the weak probe field is obtained for the arbitrary polarization of the strong coupling laser field and arbitrary values of the angular momenta of resonant atomic levels. The dependence of the relative difference in the group velocities of the two polarization components of the probe field on the polarization of the coupling field is studied.