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| Main Authors: | , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2509.19113 |
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Table of Contents:
- Paraxial light skyrmions are topological configurations that map a spatial domain of the field onto the full Poincaré sphere of polarization states. While optical skyrmions have been explored in continuous-wave regimes, their realization in the ultrafast domain remains open. Here we demonstrate that attosecond skyrmion pulses can be generated via high-harmonic generation. Advanced simulations combining single-atom strong-field theory and macroscopic propagation reveal that an infrared linearly polarized vector beam with fractional orbital angular momentum produces extreme-ultraviolet harmonic fields with nearly identical skyrmion polarization distributions across a broad spectral range. Using 1.2 $μ$m driving fields and experimentally feasible spectral filtering, we show that the coherent superposition of consecutive harmonics centered at 70 eV yields a train of skyrmion pulses with $\sim500$ attoseconds duration. Our results open opportunities to use structured attosecond light with topological polarization textures in fields as ultrafast control, imaging and spectroscopy.