High-order harmonic generation from diatomic molecules with large internuclear distance: The effect of two-center interference

TL;DR

This paper investigates how two-center interference affects high-order harmonic generation in diatomic molecules with large internuclear distances, revealing interference patterns sensitive to laser intensity.

Contribution

It introduces a strong field approximation model to analyze the impact of two-center interference on HHG spectra, highlighting the role of laser parameters.

Findings

Hump and dip structures appear in the HHG plateau.

Interference effects cause enhanced or suppressed harmonic yields.

Spectral features are highly sensitive to laser intensity.

Abstract

In the present paper, we investigate the high-order harmonic generation (HHG) from diatomic molecules with large internuclear distance using a strong field approximation (SFA) model. We find that the hump and dip structure emerges in the plateau region of the harmonic spectrum, and the location of this striking structure is sensitive to the laser intensity. Our model analysis reveals that two-center interference as well as the interference between different recombination electron trajectories are responsible for the unusual enhanced or suppressed harmonic yield at a certain order, and these interference effects are greatly influenced by the laser parameters such as intensity.