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Intense vortex high-order harmonics generated from laser-ablated plume

Mangaljit SinghInstitut National de la Recherche Scientifique—Centre Energie Matériaux Telécommunications 1 , 1650 Lionel-Boulet, Varennes, Québec J3X 1S2, CanadaM. A. FareedChemical Sciences Division, Lawrence Berkeley National Laboratory, University of California 2 , Berkeley, California 94720, USAAntoine LaraméeInstitut National de la Recherche Scientifique—Centre Energie Matériaux Telécommunications 1 , 1650 Lionel-Boulet, Varennes, Québec J3X 1S2, CanadaE. IsgandarovInstitut National de la Recherche Scientifique—Centre Energie Matériaux Telécommunications 1 , 1650 Lionel-Boulet, Varennes, Québec J3X 1S2, CanadaT. OzakiInstitut National de la Recherche Scientifique—Centre Energie Matériaux Telécommunications 1 , 1650 Lionel-Boulet, Varennes, Québec J3X 1S2, Canada

2019en

ABI

Annotatsiya

In this study, we demonstrate intense extreme-ultraviolet optical vortices generated using laser-ablation plume as the nonlinear medium. We used two types of plumes that are known to generate intense high-order harmonics for driving lasers with Gaussian beam profiles, but through different mechanisms, namely, carbon (diatomic carbon molecules) and tin (resonance with the autoionizing state). We find that the harmonic fluxes for diatomic carbon molecules are similar for Gaussian and vortex driving fields. However, for harmonics from the autoionizing state of tin (∼26.3 eV), the enhancement factor of the resonant harmonic intensity decreases by ∼50% when using the vortex driving field. The intense extreme-ultraviolet optical vortices demonstrated in this study will be useful for many applications including a material characterization technique known as optical angular momentum dichroism as well as the spectroscopy of spin-forbidden electronic transitions.

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Identifikatorlar

DOI: 10.1063/1.5131289

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