Probability of Spontaneous Emission in Processes of the Above Threshold Ionization of Atoms

TL;DR

This paper derives an expression for the probability of spontaneous emission of high-order harmonics during above-threshold ionization, analyzing how it depends on laser and atomic parameters within the multiphoton regime.

Contribution

It provides a new analytical expression for spontaneous emission probability in high-order harmonic generation under multiphoton ionization conditions.

Findings

Probability depends on pump wave and atomic medium parameters

Criteria for observing emission are established with phase locking considerations

Expression applicable in the multiphoton ionization regime

Abstract

Expression for the probability of the spontaneous emission of high-order harmonics when the emitter phases are synchronized and are obtained in the region where the multiphoton approximation is applicable to the description of the ionization of an atom (where the adiabaticity parameter satisfies gamma > 1). The dependence of this probability on the main parameters of the pump wave and the atomic medium is established. Criteria for observing emission are formulated with the consideration of phase locking.