Femtosecond envelope of the high-harmonic emission from ablation plasmas

We characterize the temporal profile of the high-order harmonic emission from ablation plasma plumes using cross-correlations with the infrared (IR) laser beam provided by 2-photon harmonic+IR ionization of rare gas atoms. We study both non-resonant plasmas (lead, gold and chrome) and resonant plasm...

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Bibliographic Details
Published in:arXiv.org 2021-03
Main Authors: Haessler, Stefan, Luc Bertrand {Elouga Bom}, Gobert, Olivier, Hergott, Jean-François, Lepetit, Fabien, Perdrix, Michel, Carré, Bertrand, Ozaki, Tsuneyuki, Salières, P
Format: Article
Language:English
Subjects:
Ablation
Cross correlation
Emission
Harmonics
Infrared lasers
Ions
Laser beams
Lasers
Photon beams
Plasmas (physics)
Rare gases
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Summary:We characterize the temporal profile of the high-order harmonic emission from ablation plasma plumes using cross-correlations with the infrared (IR) laser beam provided by 2-photon harmonic+IR ionization of rare gas atoms. We study both non-resonant plasmas (lead, gold and chrome) and resonant plasmas (indium and tin), i.e. plasmas presenting in the singly-charged ions a strong radiative transition coinciding with an harmonic order. The cross-correlation traces are found very similar for all harmonic orders and all plasma targets. The recovered harmonic pulse durations are very similar to the driving laser, with a tendency towards being shorter, demonstrating that the emission is a \stef{directly} laser-driven process even in the case of resonant harmonics. This provides valuable input for theories describing resonant harmonic emission and opens the perspective of a very-high-flux tabletop \textsc{xuv} source for applications.
ISSN:2331-8422
DOI:10.48550/arxiv.2103.16231