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 5${}^2{S}_{1\mathrm{/}2}$ (Tiwari V B $\mathit{\text{et}}\mathit{\text{al}}$ 2008 {\it Phys. Rev.} A {\bf 78} 063421). Two steady state $\mathrm{\Lambda }$-type systems of hyperfine energy levels are investigated using probe transitions into the levels F${}^{\mathrm{\prime }}$ = 2 and F${}^{\mathrm{\prime }}$ = 3 of the excited state 5${}^2{P}_{3\mathrm{/}2}$ in the presence of coupling transitions F = 3 $\to$ F${}^{\mathrm{\prime }}$ = 2 and F = 3 $\to$ F${}^{\mathrm{\prime }}$ = 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.