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Interest in lossless nonlinearities has focussed on the dispersive properties of Λ systems under conditions of electromagnetically induced transparency (EIT). We generalize the Λ system by introducing further degenerate states to realize a ``chain Λ'' atom where multiple coupling of the probe field significantly enhances the intensity-dependent dispersion without compromising the EIT condition.
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Greentree et al. (2003) studied this question.
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