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<p>Vortex light beams in the vacuum ultraviolet (VUV) range are in high demand for many applications. Specifically, the energy range of 10-17 eV is of interest as it enables probing the ultrafast dynamics of interband transitions and excitonic resonances in solids. However, VUV vortex beams are usually produced using large-scale facilities or high-order harmonic generation. In this work, we present a compact, table-top method to generate such beams using near-threshold harmonics (NTHs) in rare gases, driven by intense infrared vortex lasers carrying orbital angular momentum. Our simulations reveal distinct spectral and spatial features that vary with the gas-jet position relative to the laser focus. Using time-frequency analysis at both single-atom and macroscopic levels, we show that the NTH generation mechanism depends on the harmonic order, governed by the interplay between multiphoton and recollision pathways. Coherence-length maps and field-propagation analysis further clarify the spatial behavior of NTHs. This work establishes a foundation for compact VUV vortex sources and their potential applications in the study of ultrafast electron dynamics.</p>

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Generation of vacuum ultraviolet vortex beams via near-threshold harmonics in argon gas driven by infrared Laguerre-Gaussian lasers

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月10日

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  • Jiaxin Han,
  • Bincheng Wang,
  • Xiangyu Tang,
  • Zhiming Yin,
  • Yong Fu,
  • Jiahao You,
  • Baochang Li,
  • Shengfei Wu,
  • Cheng Jin

摘要

Vortex light beams in the vacuum ultraviolet (VUV) range are in high demand for many applications. Specifically, the energy range of 10-17 eV is of interest as it enables probing the ultrafast dynamics of interband transitions and excitonic resonances in solids. However, VUV vortex beams are usually produced using large-scale facilities or high-order harmonic generation. In this work, we present a compact, table-top method to generate such beams using near-threshold harmonics (NTHs) in rare gases, driven by intense infrared vortex lasers carrying orbital angular momentum. Our simulations reveal distinct spectral and spatial features that vary with the gas-jet position relative to the laser focus. Using time-frequency analysis at both single-atom and macroscopic levels, we show that the NTH generation mechanism depends on the harmonic order, governed by the interplay between multiphoton and recollision pathways. Coherence-length maps and field-propagation analysis further clarify the spatial behavior of NTHs. This work establishes a foundation for compact VUV vortex sources and their potential applications in the study of ultrafast electron dynamics.