4.6 Article

Attosecond pulses generated by the lighthouse effect in Ar gas

Journal

PHYSICAL REVIEW A
Volume 91, Issue 5, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.91.051801

Keywords

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Funding

  1. Institute for Basic Science [IBS-R012-D1]
  2. Ministry of Science, ICT and Future Planning
  3. Romanian Financing Authority CNDI-UEFISCDI [PN II-ID-PCE-2012-4-0342]
  4. Ministry of Science, ICT & Future Planning, Republic of Korea [IBS-R012-D1-2015-A00] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
  5. National Research Foundation of Korea [10Z20130012677, 131S-1-3-0284] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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We numerically investigate harmonic generation in Ar gas under high ionization conditions and demonstrate that a lighthouse effect is present. We examine the structure of the driving field during propagation in temporal, spectral, and spatial domains, and conclude that the complete depletion of neutral Ar on axis gives rise to additional wavelets at off-axis regions. We show that these wavelets propagate with increasing divergence as the radial distances from the axis increase, generating the rotation of the wave front, thus fulfilling a necessary condition for the lighthouse effect. We obtain attosecond bursts of light emitted with different divergences in successive optical half-cycles so that in the far field these bursts arrive at different distances from the beam axis.

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