Observation of dual electromagnetically induced transparencies in cold $^{87}Rb$ atoms

Abstract

We have observed two dual electromagnetically induced transparency (EIT) spectra in probe transmission through cold 87 Rb atoms trapped in a magneto-optical trap (MOT). These dual EIT peaks are generated in two different N-systems formed by probe, coupling and control beams interacting with different levels in D2 line transitions of 87 Rb atom. The dependence of spectral features of two N-systems on driving beams (i.e. coupling and control beams) strength and detuning has been investigated. The results show that the dual EIT spectral features in both the N-systems can be manipulated by varying the strength and detuning of both the driving beams. The two Nsystems have been modelled theoretically using a density matrix formalism and results have shown a reasonable agreement with the experimental observations.