Electromagnetically induced transparency in cold 85Rb atoms trapped in the ground hyperfine F = 2 state

We report electromagnetically induced transparency (EIT) in cold 85Rb atoms, trapped in the lower hyperfine level F = 2, of the ground state 52S1/2 (Tiwari V B et al 2008 Phys. Rev. A 78 063421). Two steady-state Λ-type systems of hyperfine energy levels are investigated using probe transitions into the levels F′ = 2 and F′ = 3 of the excited state 52P3/2 in the presence of coupling transitions F = 3 → F′ = 2 and F = 3 → F′ = 3, respectively. The effects of uncoupled magnetic sublevel transitions and coupling field's Rabi frequency on the EIT signal from these systems are studied using a simple theoretical model.