COHERENT POPULATION TRAPPING BEYOND THE ROTATING-WAVE APPROXIMATION

We consider the case of interaction of a three-level atom with a high intensity pulse electromagnetic field. Rabi frequencies are assumed to be of the order of the transition frequency or greater. We demonstrat e that coherent population trapping exists even in such a case when th e usual rotating-wave approximation is no longer valid. However, a cer tain condition on the phases of electromagnetic wave components has to be satisfied in order to make coherent population trapping possible. This condition is specific for the strong field case in contrast to th e case where the rotating-wave approximation is valid. Also we point o ut some elements for which a model of an atom with a finite number of levels may still be valid while the rotating-wave approximation breaks down.