Effects of interference between one- and two-photon processes

Abstract
Solutions are given for interaction between a three-level system and three arbitrarily intense fields, one of which has the sum frequency of the other two field frequencies. The results of a nonperturbative analytic treatment of the three-level Schrödinger equation are described. We find that the time dependence of the occupation probabilities of the three levels is strongly modified by the effects of interference between one- and two-photon processes.