Spontaneous decay processes in a classical strong low-frequency laser field

Abstract

The spontaneous emission of an excited two-level emitter driven by a strong classical coherent low-frequency electromagnetic field is investigated. We find that for relatively strong laser driving, multi-photon processes are induced, thereby opening additional decay channels for the atom. We analyze the interplay between the strong low-frequency driving and the interfering multiphoton decay channels, and discuss its implications for the spontaneous emission dynamics.

Quantum optical models of high-order harmonic generation in two-level system

“…Since in experimental settings the pulse length is in the order of femtoseconds, (typically many orders of magnitude shorter than the transition lifetime), spontaneous emission plays negligible role. Note that calculations of spontaneous emission in the presence of strong laser-field indicates [170] that the modification of the decay-rate due to the excitation is not very large.…”