Experimental and theoretical study of magnetic field effect on EIT resonances in a multilevel V-type atomic system

We have studied the effect of an external magnetic field on the electromagnetically induced transparency in a multi-level V-type system of 87 Rb using D1 1 and D2 2 lines. We apply the magnetic field at room temperature parallel to the direction of co-propagating pump and probe laser beams. Five independent EIT peaks are observed at a moderate magnetic field of 72.5 G, when 87 Rb-D 1 line is addressed by the pump laser and the probe laser is scanned across the 87 Rb-D 2 transitions. When the pump laser is tuned to the 87 Rb-D 2 transition, we could resolve two EIT peaks at the similar magnetic field. The effects of magnetic field and pump field power on the Zeeman split EIT peaks are also investigated. A theoretical model is developed considering the multiple Zeeman sublevel to reproduce the observed spectra.