Wavelength scaling of high-order harmonic yield from an optically prepared excited state atom

TL;DR

This paper investigates how the high-order harmonic yield from excited state atoms scales with wavelength, revealing a different scaling law compared to ground state atoms, through numerical simulations of neon and hydrogen.

Contribution

It demonstrates that optically prepared excited state atoms exhibit a rac{-2-3}{ ext{scaling law for harmonic yield, differing from the ground state rac{-4-6}{ ext{scaling law, based on 3D TDSE simulations.

Findings

Excited state atoms show a rac{-2-3}{ ext{wavelength scaling of harmonic yield.

Ground state atoms follow a rac{-4-6}{ ext{scaling law.

Numerical simulations confirm the different scaling behaviors.

Abstract

Wavelength scaling law for the yield of high-order harmonic emission is theoretically examined for excited state atoms which are optically prepared by simultaneously exposing to an extreme ultraviolet pulse at the resonant wavelength and an infrared pulse at a variable wavelength in the range of 0.8\mum-2.4\mum. Numerical simulations are performed based on the three-dimensional time-dependent Schrodinger equation (3D TDSE) for Ne and H. We confirm that the harmonic yield follows a \lambda^-{4-6} scaling with the single fundamental driving laser pulse; whereas for the optically prepared excited state atoms, a \lambda^-{2-3} scaling for the harmonic yield is revealed.