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Controllable Four-Wave Mixing Signal inside a Cascade Three-Level Atomic System

We experimentally report that electromagnetically induced transparency (EIT) in the nonlinear propagation of probe beam, four-wave mixing (FWM) images and in a cascade three-level atomic systems. It is shown that by changing the frequency between pumping fields or dressing fields, respectively, the properties of the measured signals including the intensity and spatial images are affected greatly, including the electromagnetically induced transparency (EIT), Aulter-Townes splitting. By changing the laser frequency we can control the four wave signal, Moreover, the AT splitting effect due to spontaneous emission was also observed under EIT conditions..