Abstract
Two coupled parametric four-wave-mixing processes in Rb atoms arestudied using perturbation theory, which reveals clear evidence of theappearance of quantum beat at 608 cm−1, corresponding to theenergy difference of the 7s−5d states of Rb atoms, in theparametric four-wave-mixing signals. A pump–probe technique is utilizedto observe the quantum beat. Time-varying characteristics of thequantum beat are investigated using time-dependent Fourier transform.The results show that the time-varying characteristics of the quantumbeat not only offers a sensitive detecting method for observing thedecay of atomic wave packets, but also provides a potential tool formonitoring the dissociation of molecules.
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