The Electromagnetically Induced Transparency (EIT) is associated with a Λ three-level system and the spectral
position of EIT window can be changed by varying the frequency of the coupling field, however, at large detuning the
EIT will evolve into a dispersion-like feature and transparency property of EIT become less obvious. In this paper, it is
shown that we can perform EIT frequency tuning by a radio-frequency (rf) field. In the cascade quasic-Λ four-level
system, the absorption profile of probe field is calculated by solving the equations of motion of the density matrix. It is
shown that the Autler-Townes doublet originates from the rf-field induced dynamic Stark effect and the spectral position
of EIT window is determined by the frequency detuning of the coupling field. When the frequency detuning of the
coupling field is half of the rf Rabi frequency, the EIT feature remain its absorptive profile. The frequency tuning rang of
EIT is determined by the rf Rabi frequency, and can be explained using a dressed-state analysis. Therefore, frequency
tuning range of EIT can be controlled by the rf Rabi frequency.
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