Abstract
In a previous paper, we have already considered the system composed by a two-level atom interacting with a coherent external electromagnetic field. No application whatsoever has been made of the rotating wave approximation. Being especially interested in the problem of higher harmonic generations for the case of very intense laser fields, we have developed in this Letter a much more efficient way to obtain these solutions as well as to carry out some calculations in a range in which the parameters take extreme values. Also the formalism allows us now to provide analytic expressions in the WKB regime for the electric dipole moment and the population inversion. The spectrum can be decomposed in periodic and non-periodic contributions. Only the latter depends upon the Floquet exponent and can be responsible of the main complexities of the observed Rabi revivals and the hyper-Raman shift.
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