Abstract
The role of hyperfine structure in electromagnetically induced transparency (EIT) is investigated by studying the 5S1/2-5P3/2-5D3/2,5/2 cascade system in 85Rb and 87Rb. We show that if the hyperfine splitting Δhfs is larger than the Rabi frequency of the coupling beam, Ωc, then the observed EIT spectra can be modelled by adding terms corresponding to each hyperfine state. However, in the strong-coupling limit, Ωc>>Δhfs, a complete multilevel description is required.
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