Efficient light storage in a Lambda system due to coupling between lower levels.
We show analytically and numerically that the application, during the storage time, of an additional weak field connecting the lower levels (LLs) of a Lambda system can modify the spin coherence and the amplitude of the retrieved probe without causing distortion. The LL coupling field adds an additional phase-dependent term to the probe propagation equation. The retrieved probe is amplified when the total relative phase Phi=0 or pi and decreased when Phi=pi/2.
Eilam
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Department of Chemistry, Bar-Ilan University, Ramat Gan 52900, Israel.
Wilson-Gordon
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Friedmann
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