Phys. Rev. Lett. 70, 1421–1424 (1993)Near dipole-dipole effects in lasing without inversion: An enhancement of gain and absorptionless index of refractionReceived 11 September 1992; published in the issue dated 8 March 1993 We include the effect of density-dependent near dipole-dipole interactions in order to generalize the theory of a simple three-level system that exhibits lasing without inversion and an enhanced index of refraction at zero absorption. For certain values of atomic density, our generalized theory predicts a novel enhancement of inversionless gain and absorptionless index by more than 2 orders of magnitude. © 1993 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.70.1421
DOI:
10.1103/PhysRevLett.70.1421
PACS:
42.65.Pc, 42.50.Hz, 42.50.Md, 42.65.An
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