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We demonstrate the double electromagnetically induced transparency(double-EIT) and double four-wave mixing (double-FWM) based on a new scheme ofnon-degenerate four-wave mixing (FWM) involving five levels of a cold 85Rbatomic ensemble, in which the double-EIT windows are used to transmit the probefield and enhance the third-order nonlinear susceptibility. The phase-matchingconditions for both four-wave mixings could be satisfied simultaneously. Thefrequency of one component of the generated bichromatic field is less than theother by the ground-state hyperfine splitting (3GHz). This specially designedexperimental scheme for simultaneously generating different nonlinearwave-mixing processes is expected to find applications in quantum informationprocessing and cross phase modulation. Our results agree well with thetheoretical simulation.

Bichromatic field generation from double-four-wave mixing in a double-electromagnetically induced transparency system