Refractive Index Enhancement with Vanishing Absorption in an Atomic Vapor

Details Refractive Index Enhancement with Vanishing Absorption in an Atomic Vapor Refractive Index Enhancement with Vanishing Absorption in an Atomic Vapor

2008-07-16

arxiv.org/abs/0807.2584v1

Phys. Rev. Lett. 101, 147401 (2008)

Physics

Quantum Physics

11 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.101.147401

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

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