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

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... ental 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