Abstract
We report an experimental observation of the optical transparency enhancement resonances
in Hanle-electromagnetically induced transparency (EIT) configuration with a microwave field
excitation. In this experimental system, a strong control field and a weak probe field form
three-level-type configurations of EIT. The fourth level is coupled by an additional microwave
field. With the microwave field excitation, the probe field undergoes a process of absorption to
transparency when the probe field decreases. Compared with the EIT effect, this result indicates
optical transparency enhancement. A simple theoretical model and a numerical simulation are
presented to explain the observed experimental results. The applications of these optical features
are also discussed.
© 2013 Chinese Optics Letters
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