Observation of Ion-wave Satellites to Laser Harmonics in Intense Picosecond Laser-Solid Interaction
Plasma Physics
2025-11-04 v1 Optics
Abstract
Detailed spectra of harmonics produced from ultra-intense, sub-picosecond, high-contrast laser pulses incident on solid targets have shown the first observation of regular red- and blue-shifted satellites. Their frequency shift is slightly less than the frequency of a nominal, pure ion-plasma wave associated with electron critical density, where an ion-acoustic wave would be expected. We explain this as the result of a substantial reduction of Debye shielding as the intense optical fields compete to drive electrons in large-amplitude oscillations. This general effect leads to a larger, dynamical and anisotropic Debye length, which should have a broad impact on plasma physics in this regime.
Keywords
Cite
@article{arxiv.2511.00174,
title = {Observation of Ion-wave Satellites to Laser Harmonics in Intense Picosecond Laser-Solid Interaction},
author = {R. S. Marjoribanks and L. Zhao and F. W. Budnik and G. Kulcsar and R. Wagner and D. Umstadter and R. P. Drake and M. C. Downer},
journal= {arXiv preprint arXiv:2511.00174},
year = {2025}
}