We report our observations on probe transmission, four-wave mixing (FWM), and fluorescence signals with dressing effect in two V-type three-level as well as in two two-level atomic systems. According to the phenomena observed in such systems, we find that the dressing effect at the same energy level can be affected by hyperfine structure and at different energy levels by transition dipole moment. We also find that both the - and -directional spatial splittings of probe beam and FWM signals are affected greatly by the dressing effect, which can also control the spatial shift and focusing of FWM signal. Studies on such controllable beam splitting can be very useful in understanding spatial pattern formation and applications of spatial signal processing.
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