Perturbation Method for Atoms in Intense Light Beams

摘要: … The problem of interaction of atoms with intense light is reformulated via a time-dependent unitary transformation. … Indeed, the concept of photon absorption has its roots in perturbation theory, so that even the meaning of the concept becomes unclear at the intensities that we consider. In view of these difficulties, we propose a reformulation of the problem of the interaction of … For simplicity, we consider a hydrogen atom in the nonrelativistic dipole approximation. The …