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Analytical expressions for the semiclassical dressed states and correspondingquasienergies are obtained for a two-level quantum system driven by anonresonant and/or strong laser field in a coherent state. These expressionsare of first order in a proper perturbative expansion, and already contain allthe relevant physical information on the dynamical and spectroscopic propertiesdisplayed by these systems under such particular conditions. The influence ofthe laser field parameters on transition frequencies, selection rules, and lineintensities can be easily understood in terms of the quasienergy-level diagramand the allowed transitions between the different semiclassical dressed states.Comment: 13 pages, LaTeX. Final version to appear in J. Phys.

Semiclassical dressed states of two-level quantum systems driven by non-resonant and/or strong laser fields