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Preparation of Free-Surface Hyperbolic Water Vortices
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Generation of intense high-order vortex harmonics.

Xiaomei Zhang1, Baifei Shen1,2, Yin Shi1

  • 1State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China.

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Scientists generated intense high-order optical vortices in the extreme ultraviolet region using relativistic harmonics from solid targets. This breakthrough enables attosecond pulse durations and opens new avenues in high-resolution detection and twisted photon generation.

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Area of Science:

  • Physics
  • Optics
  • Quantum Electronics

Background:

  • Generating high-order optical vortices in the extreme ultraviolet (XUV) region is challenging.
  • Orbital angular momentum (OAM) carrying beams are crucial for advanced applications.
  • Relativistic harmonics offer a pathway to shorter wavelengths and higher intensities.

Purpose of the Study:

  • To present a novel scheme for generating intense high-order optical vortices in the XUV region.
  • To investigate the properties of these vortices, including their azimuthal mode scaling and intensity.
  • To explore potential applications of these intense vortex beams.

Main Methods:

  • Utilizing three-dimensional particle-in-cell simulations.
  • Impacting a solid foil with a linearly polarized Laguerre-Gaussian laser pulse.
  • Analyzing both reflected and transmitted light beams for harmonic generation.

Main Results:

  • Successfully generated high-order harmonics of a high-order vortex mode in both reflected and transmitted beams.
  • Observed azimuthal mode scaling with harmonic order.
  • Achieved attosecond pulse durations with intensities in the relativistic region.
  • Demonstrated combined fine transversal and longitudinal structures in the generated vortex beam.

Conclusions:

  • The proposed scheme effectively generates intense high-order optical vortices in the XUV region.
  • The generated beams possess unique properties suitable for advanced applications.
  • This work opens new opportunities in high-resolution detection, inner shell ionization, and high-energy twisted photon generation.