We study the effect of near dipole-dipole interactions on the electric susceptibility of a coherently prepared three-level Λ system. We discuss the influence of atomic nonlinearities on the recently predicted enhancement of the absorptionless index of refraction and inversionless gain due to local field effects [J.P. Dowling and C.M. Bowden, Phys. Rev. Lett. 70 1421 1993] and predict a density dependent, or piezophotonic, switching between absorption and amplification.
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Manka et al. (1994) studied this question.
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