Аннотация:Spontaneous emission of the quantum system driven by a high intensity classical laser field is
analyzed. The study is based on the accurate consideration of quantum system interaction with
vacuum quantized field modes in the first order of perturbation theory, while the intense laser field
is considered classically beyond the perturbation theory. It is demonstrated that the spectrum of
the spontaneous emission can be used for analyzing of the strong-field dynamics and structure of
the energy spectrum of the atomic system. The obtained data are compared with that obtained in
the frames of semiclassical approximation typically used for analyzing of the strong-field dynamics.
It is found that the applicability of the semiclassical approach is strictly limited.