Abstract
Electromagnetically induced transparency (EIT) of three-level atoms in a strong laser pulse1 is attracting growing interest. We demonstrate here the feasibility of a modulation-induced inhibition of dynamics (MID), self-transparency, and very-high- order frequency mixing (HFM) in a two- level system (TLS) subjected to a periodically modulated laser field. In contrast to self-induced transparency (SIT) in 2π solitons characterized by the dramatic dynamics of population,2 in MID the TLS dynamics (i.e., the oscillations of both the population and the polarization) are almost fully suppressed. For a sinusoidal modulation, the conditions for MID coincide with those for the resonances occurring if the frequency of modulation ΩM is close to a subharmonic of the averaged Rabi frequency .3 It has also been shown4 that similar resonances in TLS may occur even when the system is driven by a cw (non- modulated) field strong enough to superdress TLS by having ΩR exceed the TLS unperturbed frequency ω0. We showed that at these resonances, in addition to the suppressed population difference δ, the TLS driven polarization p vanishes too, resulting, together with vanishing δ, in the collapse of Rabi sphere. Even when the driving spectral components are strongly off resonance, the field-induced Rabi splitting brings TLS at the MID points into exact resonance with the field. MID results in a self-transparency for the entire spectrum of the incident field (which could be very broad), allowing its propagation without dispersion suppressed now over the spectrum.
© 1995 Optical Society of America
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