Quantum beats in the dressed state nutation

In a V-shaped three-level double-resonance configuration, there is strong quantum beats superimposed in a nutation signal in the probe laser response. In this paper, the beats in the dressed state nutation is studied theoretically within dressed state picture and the result is presented. An important conclusion is that the strong quantum beats in such a configuration occurred mainly as a result of the intrinsic coherence of the dressed states. Our result extends the coherent transient study in bared atomic transition to dressed state transitions.