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

Journal Article · · Applied Physics Letters
DOI: https://doi.org/10.1063/1.5131289 · OSTI ID:1582351
ORCiD logo [1]; ORCiD logo [2];  [1];  [1];  [1]
  1. Inst. National de la Recherche Scientifique—Centre Energie Matériaux Telécommunications, Québec (Canada)
  2. Inst. National de la Recherche Scientifique—Centre Energie Matériaux Telécommunications, Québec (Canada); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

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. We conclude 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.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1582351
Journal Information:
Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 23 Vol. 115; ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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