Steep dispersion of opposite signs in driven degenerate two-level atomic transitions have been predicted and observed on the D₂ line of ⁸⁷Rb in an optically thin vapor cell. The intensity dependence of the anomalous dispersion has been studied. The maximum observed value of anomalous dispersion ( dn/dν-6×10^-11Hz^-1) corresponds to a negative group velocity Vg-c/23000.
No takes yet. Share an insight, caveat, or question.
Akulshin et al. (1999) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: