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Space-time wave packets propagating a kilometer in air

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arxiv 2209.03309 v1 pith:A44MXSNB submitted 2022-09-07 physics.optics

Layton A. Hall , Miguel A. Romer , Bryan L. Turo , Tina M. Hayward , Rajesh Menon , Ayman F. Abouraddy This is my paper · ORCID
classification physics.optics
keywords approxpacketspropagationwavebandwidthdistanceexpandsspace-time
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abstract

We report on the diffraction-free propagation of space-time wave packets (STWPs) -- a class of propagation-invariant pulsed beams -- for $\sim\!1$ km in an open-air laser range in a low-turbulence scenario. Making use of $\approx\!100$-fs pulses (bandwidth $\sim\!25$ nm) at a wavelength of $\approx\!1$ $\mu$m, we construct an STWP with a transverse width of $\approx\!2$ mm that expands to $\approx\!3$ mm after $\sim\!500$ m, and another that expands from $\approx\!8$ mm to $\approx\!10$ mm after 1 km. The propagation of the STWPs is compared to Gaussian wave packets of the same transverse spatial width and bandwidth. We establish a theoretical model that accounts for the significant factors limiting the STWP propagation distance and suggests the path to further extending this distance.

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Forward citations

Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Avoiding a line-of-sight obstacle via deep sub-Rayleigh shadow-projection utilizing space-time wave packets

    physics.optics 2026-07 accept novelty 6.5 of 10

    STWPs project transverse nulls of width 80 µm–48 mm whose axial shadows are 25–250× shorter than the Rayleigh length of a same-width Gaussian beam at ~1 µm.

  2. Bending space-time wave packets

    physics.optics 2025-09 conditional novelty 5.0 of 10

    Space-time wave packets can be designed to follow arbitrary power-law curved trajectories with symmetric profiles and scale-independent acceleration.

  3. Long-distance axial spectral encoding using space-time wave packets

    physics.optics 2025-05 conditional novelty 5.0 of 10

    Space-time wave packets produced on-axis spectra that red-shift or blue-shift with propagation over 100 to 200 meters in open air, and that can also be tuned at a fixed position by changing an internal pulse parameter.

  4. Universality and non-differentiability: A new perspective on angular dispersion in optics

    physics.optics 2025-06 conditional novelty 4.0 of 10

    A perspective classifies angular dispersion into differentiable and non-differentiable forms and argues that the latter underlies the unusual free-space behavior of space-time wave packets.

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