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We report a proof-of-principle experiment where the refractive index of anatomic vapor is enhanced while maintaining vanishing absorption of the beam.The key idea is to drive alkali atoms in a vapor with appropriate controllasers and induce a gain resonance and an absorption resonance for a probe beamin a two-photon Raman configuration. The strength and the position of these tworesonances can be manipulated by changing the parameters of the control lasers.By using the interference between these two resonances, we obtain an enhancedrefractive index without an increase in the absorption.

Refractive Index Enhancement with Vanishing Absorption in an Atomic Vapor