{"paper":{"title":"Space-time wave packets propagating a kilometer in air","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"physics.optics","authors_text":"Ayman F. Abouraddy, Bryan L. Turo, Layton A. Hall, Miguel A. Romer, Rajesh Menon, Tina M. Hayward","submitted_at":"2022-09-07T17:16:09Z","abstract_excerpt":"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 spat"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2209.03309","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2209.03309/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}