Abstract
We demonstrate different dressed processes of four-wave mixing (FWM), as changing the powers of the probe, pump, and dressing fields, respectively, in ladder-type three-level system. It is demonstrated that scanning detuning of the dressing field can lead to the direct detection of the dressing effects and the interaction between the dressing fields, compared with scanning that of the probe field. Moreover, by respectively controlling the powers of the dressing, pump, and probe fields, the enhancement and suppression of FWM signals can be switched sensitively. Meanwhile, the spatial splitting in y direction of FWM signal due to the cross-phase modulation and electromagnetically induced gratings is observed, respectively. Such nonlinear signal with switchable enhancement has potential applications in optical switching, optical communication, and quantum information processing.
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