Electromagnetically induced transparency in an open V-type molecular system

Abstract

We report experimental observation of electromagnetically induced transparency (EIT) in an inhomogeneously broadened V-type Na 2 molecular system. The experiment is performed with both co-and counter-propagating arrangements for the propagation direction of the coupling and probe laser beams. In our theoretical model we employ the density matrix formalism, as well as perturbative methods for obtaining the probe field absorption profile for both open and closed systems. Simulations of the experimental data show excellent agreement with the predictions derived from the basic theory. Our fluorescent intensity measurements show that in the copropagating configuration the EIT plus saturation window depth is about 95%, while under similar conditions in the counter-propagating geometry we observed 40-45% reduction in the fluorescence signal around line center. To separate the two simultaneously occurring mechanisms in a V-type system, namely EIT and saturation, that are induced by the coupling field, we have carried out theoretical calculations, which show that in the co-propagating case a significant fraction of the depth of the dip is due to the coherent effect of EIT. When the

Nonlinear selective reflection spectroscopy of V‐type atomic system at the gas‐solid interface

“…A dip appears near the resonance is caused by EIT which is not related to saturation. By comparison, saturation and EIT cause the dip respectively in free space [27]. So the contributions of saturation and EIT in V-type reflection spectra are different from those spectra in free space.…”

“…[27], EIT and saturation occur simultaneously in a V-type system in free space, which is induced by pump field. In order to analyze EIT and saturation in reflection spectra at the interface, we study the reduced density matrix equations (16a)-(16f) and (19a)-(19f).…”

“…EIT has been studied in Λ, Ξ and V-type systems in free space [25][26][27], and has also been studied in Λ and Ξ systems at the interface [28,29]. However, there is no report about EIT in V-type system at the interface as far as we know.…”

“…However, there is no report about EIT in V-type system at the interface as far as we know. V-type system has an essential difference compared to Λ or Ξ -type systems, which has been studied in reference [27]. For a three-level Λ system, atoms are mainly populated in two ground states.…”

EIT line shape in an open and partially closed multilevel V-type system

“…The EIT under V-type configuration have been done by several authors [29][30][31][32][33][34] so far.…”