Optical Nutation Effect in the Three-Level System Driven by a Coherent Microwave Field

In this paper,a coherent transient effect-optical nutation in Bloch form is studied semiclassically in the three-level atomic system driven by a coherent microwave field.The amplitude of the optical nutation signal field is obtained.It is found that the signal field,related to the microwave,is the overlap of two slow oscillations instead of one.