Noble Gas Clusters and Nanoplasmas in High Harmonic Generation
M. Aladi, R. Bolla, P. R\'acz, I. B. F\"oldes
TL;DR
This paper investigates high harmonic generation from xenon noble gas clusters, revealing how nanoplasma electrons cause spectral shifts that can be used to estimate cluster properties.
Contribution
It presents new insights into how nanoplasma electrons influence harmonic spectra and proposes a method to estimate cluster size and density from spectral shifts.
Findings
Spectral shifts depend on backing pressure and laser intensity.
Nanoplasma electrons can cause redshifts opposing ionization blueshift.
Spectral shifts can be used to estimate cluster size and density.
Abstract
We report a study of high harmonic generation from noble gas clusters of xenon atoms in a gas jet. Harmonic spectra were investigated as a function of backing pressure, showing spectral shifts due to the nanoplasma electrons in the clusters. At certain value of laser intensity this process may oppose the effect of the well-known ionization-induced blueshift. In addition, these cluster-induced harmonic redshifts may give the possibility to estimate cluster density and cluster size in the laser-gas jet interaction range.
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