Work

Influence of pre-pulse and main pulse energies on the resonant harmonic from Gallium laser-ablation plumes

Year: 2026

Type: article

Abstract: We investigate the underexplored multiphoton ionization regime of resonantly enhanced harmonic generation in gallium laser-ablation plumes. Resonant harmonics generate quasi-monochromatic extreme ultraviolet radiation with a pronounced coherent intensity enhancement. In this experimental study, we systematically examine high-order harmonic generation yield by independently varying the energies of the pre-pulse, which forms the laser-ablation plume, and the main pulse, which drives the harmonic emission. This approach enables precise evaluation of how each pulse contributes to the overall efficiency of resonant harmonic generation. Throughout this study, we identify the optimal conditions for maximizing the generation efficiency of gallium resonant harmonics driven by a 400 nm laser. Our results demonstrate an effective method for generating intense, quasi-monochromatic femtosecond extreme ultraviolet radiation and offer valuable insight into the role of autoionizing resonances within the multiphoton ionization regime.

Source: Fundamental Plasma Physics

DOI: 10.1016/j.fpp.2026.100110

Authors: Ramin Ghahri Shirinabadi, Feng Zhu, Mangaljit Singh, Romain Marcelino, Antoine Laramée, Tsuneyuki Ozaki

Institutions: Institut National de la Recherche Scientifique, Canadian Light Source (Canada), Polytechnique Montréal

Language: English

Topic: Laser-Matter Interactions and Applications

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $1,070

Funder: Natural Sciences and Engineering Research Council of Canada