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VOLUME 61 (1995) | ISSUE 6 | PAGE 461
Spectral lineshape in a polarization cascade
An interference effect due to a radiative (spontaneous) cascade of polarization is predicted in the absorption spectrum of a doublet corresponding to transitions between four levels. Spectral and amplitude properties of the effect are analyzed. Under certain conditions there can be amplification without a population inversion. © 1995 American Institute of Physics.