Acta Optica Sinica
Influence of atomic coherence on the absorption-dispersion relation in V-type energy-level scheme
Wenqi Zhang
Abstract
A new feature will be exhibited in the absorption-dispersion relation if quantum coherence is induced by an external field in the medium consisting of atoms of V-type energy-level configuration. In particular, when a weak light of a certain frequency travels in the medium, the refractive index can be larger than 1 where the absorption vanishes.