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    Space-time (ST) wave packets resist diffraction for extended propagation. Researchers demonstrated a novel ST light sheet achieving a 70-meter propagation distance, overcoming previous limitations.

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    Area of Science:

    • Optics and Photonics
    • Wave Phenomena

    Background:

    • Pulsed beam propagation in free space is fundamentally limited by diffraction and space-time coupling.
    • Space-time (ST) wave packets possess unique spatio-temporal correlations that enable propagation invariance.

    Purpose of the Study:

    • To investigate the maximum achievable propagation distance for ST wave packets.
    • To synthesize and characterize a novel ST light sheet for extended free-space propagation.

    Main Methods:

    • Utilized a custom-designed phase plate fabricated via gray-scale lithography.
    • Employed a laser-damage threshold of approximately 0.5 J/cm² for the phase plate.
    • Synthesized a ST light sheet with a width of ~700 μm and a bandwidth of ~20 nm.

    Main Results:

    • Successfully synthesized a ST light sheet with specific spatial and spectral characteristics.
    • Experimentally confirmed a significant propagation distance of approximately 70 meters for the synthesized ST light sheet.
    • Demonstrated the potential of ST wave packets to overcome diffraction limits.

    Conclusions:

    • The study successfully extended the propagation distance of pulsed beams using ST wave packets.
    • The developed phase plate and ST light sheet offer a promising approach for long-distance beam propagation applications.
    • This research highlights the practical feasibility of achieving propagation-invariant light sheets.