Theory of the Atom Transition Processes in Two-level System under Dressed State Picture

The atom transition processes in two-level system are investigated under the dressed state picture.Theoretical description from the point of quantum interference is presented clearly to formulate some physical phenomena in two-level system.The area of the excited pulse plays an important phase factor role in effect of quantum interference.The control function induced by evolution of the light field is formulated in the description.The physical image of some effect and phenomena is very well presented by those results.