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Enhancing coherent nonlinear-optical energy exchange between ordinary and backward waves in nonmagnetic materials

Alexander A. Popov, Mikhail I. Shalaev, S. A. Myslivets, Vitaly V. Slabko, Igor S. Nefedov

Published Jan 1, 2012• 0 citations
OpenAlex

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Two four-wave mixing (FWM) processes with different directions and frequencies can coexist and interfere in a four-level inverted-Y-type atomic system, the generated FWM beams fall into two different electromagnetically induced transparency windows. We report Autler-Townes splitting and dressed suppression and enhancement of two generated FWM beams. In the case of matched slow FWM beams, two FWM processes compete and exchange their energies between them, the forward four-wave beam give its energy to the backward four-wave beam by interaction for long distance. Such studies of two FWM beams can have vital applications in studying the higher-order nonlinear optical processes, generating correlated photon pairs and quantum information processing.
The generation of reflected and transmitted waves in induced superradiance is investigated. It is demonstrated that the exponential increase in the amplitude of the total field at the linear stage of the process may be accompanied by a periodic coherent exchange between the forward and backward waves in a sample. Transition to the nonlinear stage in a certain phase of this exchange determines the predominance of the transmitted or reflected wave in the pulse. The influence of the area of the initiating pulse and the sample length is considered.