Abstract

Effects of neighboring transitions through Doppler broadening on electromagnetically induced absorption (EIA) and electromagnetically induced transparency (EIT) of the degenerate two-level system at the ${F_g} = 2 \to {F_e} = 1,2$, and 3 transitions of the $^{87}{\rm{Rb}}$ D2 line have been investigated. Two different polarization configurations, such as linear parallel and linear perpendicular polarizations of coupling and probe lasers, have been studied. We study the significant variation of EIT and EIA due to the effect of the neighboring transitions via artificial variation of the hyperfine spacings of the $5{P_{3/2}}$ state. We have a new observation such as EIT instead of EIA due to the neighboring effect, even in the case of closed systems such as ${F_g} = 2 \to {F_e} = 3$ of $^{87}{\rm{Rb}}$ for the linear parallel configuration, for the first time to our best knowledge. The observed spectra match well with theoretically calculated spectra. EIAs for the open ${F_g} = 2 \to {F_e} = 1$ and 2 transitions at the linear perpendicular polarization are observed due to neighboring effects. This system may be applied to optical switching systems for future quantum processing application.

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