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The electromagnetically induced transparency (EIT) and its dispersion properties in a four-level inverted-Y atomic system are investigated. The absorption spectrum of a weak probe field shows two EIT windows (dark resonances) whose location, width, and depth can be controlled by manipulating the parameters of the coupling fields; the corresponding dispersion properties are also measured by using a...
A four-level model is proposed where sub-Doppler resolution, enhanced absorption and transparency windows for a weak probe field are manipulated by using two coherent driving fields in the way that is not possible in three-level schemes. We show how an interplay of quantum coherence and interference effects induced by two driving fields allows one to concurrently couple molecules from a wide velocity...
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