Abstract
In a two-level system that is subjected to a resonant coherent pump, an extraresonance that resembles stimulated Rayleigh scattering takes place when the pump reaches a moderate intensity. In addition to the major features obtained in pressure-induced extraresonance, this scattering is also verified as a field-induced extra-resonance. A nonlinear power-induced decay rate was found and is predicted to give new features of the extraresonance in the gain and in the line shape. Because of the existence of this decay, Lorentzian-shaped contribution to the gain, in addition to the well-known dispersive one, was found. These effects are especially pronounced in a dephasing mechanism and may produce an extraresonance with a frequency shift that is considerably larger than that of the conventional pressure-induced one.
© 1990 Optical Society of America
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