Femtosecond envelope of the high-harmonic emission from ablation plasmasReport as inadecuate

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1 Photonics Institute 2 SPAM - Service des Photons, Atomes et Molécules 3 INRS - Institut National de la Recherche Scientifique Québec

Abstract : 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 two-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 a harmonic order. The cross-correlation traces are found to be 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 directly laser-driven process even in the case of resonant harmonics. This provides a valuable input for theories describing resonant-harmonic emission and opens the perspective of a very high flux tabletop XUV source for applications.

Author: Stefan Haessler - L Elouga Bom - O Gobert - J-F Hergott - F Lepetit - M Perdrix - B Carré - T Ozaki - Pascal Salières -

Source: https://hal.archives-ouvertes.fr/


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