Spectroscopy of the atomic system driven by high intensity laser field

TL;DR

This paper investigates the spontaneous emission spectrum of an atomic system under high-intensity laser fields, revealing limitations of semiclassical models and providing insights into strong-field atomic dynamics.

Contribution

It offers a detailed quantum analysis of spontaneous emission in strong laser fields, highlighting the limitations of semiclassical approximations.

Findings

Spontaneous emission spectrum reveals strong-field atomic dynamics.

Semiclassical approximation has limited applicability in high-intensity regimes.

Quantum approach provides more accurate insights into atomic energy structures.

Abstract

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.