Crossover from Electromagnetically Induced Transparency to Autler-Townes Splitting in Open V-Type Molecular Systems

摘要

We investigate electromagnetically induced transparency (EIT) andAutler-Townes splitting(ATS) in an open V-type molecular system. Throughdetailed analytical calculations on the absorption spectrum of probe laserfield by using residue theorem and spectrum decomposition, we find that EIT mayoccur and there exists a crossover from EIT to ATS (i.e. EIT-ATS crossover) forhot molecules. However, there is no EIT and hence no EIT-ATS crossover for coldmolecules. Furthermore, we prove that for hot molecules EIT is allowed even fora counter-propagating configuration. We provide explicit formulas of EITconditions and widths of EIT transparency windows of probe field when hotmolecules work in co-propagating and counter-propagating configurations,respectively. Our theoretical result agrees well with the recent experimentalone reported by Lazoudis et al. [Phys. Rev. A 83, 063419 (2011)].