Crossover from electromagnetically induced transparency to Autler-Townes splitting in open V-type molecular systems

摘要

We investigate electromagnetically induced transparency (EIT) and Autler-Townes splitting (ATS) in an opennV-type molecular system. Through detailed analytical calculations of the absorption spectrum of a probe lasernfield using the residue theorem and spectrum decomposition, we find that EIT may occur and a crossover from EITnto ATS exists for hot molecules. However, there is no EIT and hence no EIT-ATS crossover for cold molecules.nFurthermore, we prove that for hot molecules EIT is allowed even for a counter-propagating configuration. Wenprovide explicit formulas of EIT conditions and widths of EIT transparency windows of the probe field whennhot molecules work in copropagating and counter-propagating configurations, respectively. Our theoretical resultnagrees well with the recent experimental ones reported by Lazoudis et al. [Phys. Rev. A 83, 063419 (2011)].