Comparison between transparencies of $5S_{1/2}\text{-}5P_{3/2}\text{-}4D_{5/2}$ and $5S_{1/2}\text{-}5P_{3/2}\text{-}5D_{5/2}$ transitions of ${}^{87}\mathrm{Rb}$ atoms

Abstract

We have experimentally and theoretically studied the causes of the transparency spectra of the $5S_{1/2}\text{-}5P_{3/2}\text{-}4D_{5/2}$ and $5S_{1/2}\text{-}5P_{3/2}\text{-}5D_{5/2}$ transitions of ${}^{87}\mathrm{Rb}$ atoms. Although, the two-photon resonance of the $5S_{1/2}\text{-}5P_{3/2}\text{-}4D_{5/2}$ transition was not Doppler-free in an Rb vapor, we observed the transparency phenomenon in this transition. The main cause of the transparency of the $5S_{1/2}\text{-}5P_{3/2}\text{-}4D_{5/2}$ transition was double-resonance optical pumping (DROP) due to two-step excitation, and that of the $5S_{1/2}\text{-}5P_{3/2}\text{-}5D_{5/2}$ transition was DROP and electromagnetically induced transparency due to two-photon coherence. We confirmed the experimental results with theoretical results calculated using the density matrix equations considering all the degenerate magnetic sublevels of both transitions of the ${}^{87}\mathrm{Rb}$ atoms.

©2012 Optical Society of America

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