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Related Experiment Video

Updated: Oct 12, 2025

Direct Imaging of Laser-driven Ultrafast Molecular Rotation
10:52

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Published on: February 4, 2017

9.8K

Bright, single helicity, high harmonics driven by mid-infrared bicircular laser fields.

Kevin M Dorney, Tingting Fan, Quynh L D Nguyen

    Optics Express
    |November 23, 2021
    PubMed
    Summary

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    Isolated Attosecond Spatiotemporal Optical Vortices: Interplay between the Topological Charge and Orbital Angular Momentum Scaling in High Harmonic Generation.

    Physical review letters·2025

    Researchers extended the photon energy of circularly polarized high-harmonic generation (HHG) using dual-color lasers. This technique achieved the highest photon energy for circularly polarized HHG to date, enabling new applications in chiral spectroscopies.

    Area of Science:

    • Atomic, Molecular, and Optical Physics
    • Attosecond Science
    • X-ray Spectroscopy

    Background:

    • High-harmonic generation (HHG) offers a compact source of ultrashort light pulses.
    • Tailoring HHG polarization and photon energy is crucial for advanced applications.
    • Extending the energy range of circularly polarized HHG is a key research frontier.

    Purpose of the Study:

    • To extend the photon energy range of circularly polarized high-harmonics.
    • To generate single-helicity high-harmonic generation (HHG) spectra.
    • To enable dynamic HHG chiral spectro-microscopies beyond the carbon K edge.

    Main Methods:

    • Utilized counter-rotating femtosecond laser pulses at 0.8 µm and 2.0 μm.
    • Drove high-harmonic generation in helium and argon media.

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  • Theoretically analyzed the extension of photon energies beyond the carbon K edge.

    • Main Results:

    • Achieved circularly polarized soft x-ray harmonics exceeding 170 eV in helium.
    • Generated dense, single-helicity HHG spectra in argon well beyond the Cooper minimum.
    • Demonstrated theoretical potential for extending circularly polarized HHG beyond the carbon K edge.

    Conclusions:

    • The dual-color laser approach significantly extends the achievable photon energy for circularly polarized HHG.
    • Single-helicity HHG spectra were generated, consistent with attosecond pulse trains.
    • This advancement broadens the scope of molecular and materials systems accessible to dynamic HHG chiral spectro-microscopies.