Even–odd harmonics generated from above-threshold ionization

Abstract

We are reporting a theoretical prediction: The photoelectrons forming above-threshold-ionization (ATI) peaks emit both even and odd harmonics. These harmonics exhibit plateau and cut-off features similar to those odd-only harmonics observed in ATI experiments.

Graphical abstract

Keywords

strong-field laser physics / above-threshold inoization / high harmonic generation / even–odd harmonics / nonperturbative quantum electrodynamics