Laser-induced bound-state phases in high-order harmonic generation

TL;DR

This paper investigates how laser-induced Stark shifts affect the phase of high-order harmonics in polar molecules, providing analytical tools to improve molecular orbital reconstruction techniques.

Contribution

It introduces an analytical expression to subtract Stark phases from harmonic measurements, enhancing orbital tomography accuracy.

Findings

Stark shifts significantly influence harmonic phases in polar molecules

Derived an analytical formula for first-order Stark phase correction

Improves the accuracy of molecular orbital reconstructions

Abstract

We present single-molecule and macroscopic calculations showing that laser-induced Stark shifts contribute significantly to the phase of high-order harmonics from polar molecules. This is important for orbital tomography, where phases of field-free dipole matrix elements are needed in order to reconstruct molecular orbitals. We derive an analytical expression that allows the first-order Stark phase to be subtracted from experimental measurements.