Year: 2026
Type: article
Abstract: We report on the diffraction-free propagation of space-time wave packets (STWPs) – a class of propagation-invariant pulsed beams—for ∼ 1 km in an open-air laser range in a low-turbulence scenario. Making use of ≈ 100 fs pulses (bandwidth ∼ 25 nm) at a wavelength of ≈ 1 μ m, we construct an STWP with a transverse width of ≈ 2 mm that expands to ≈ 3 mm after ∼ 500 m, and another that expands from ≈ 8 mm to ≈ 10 mm after 1 km. The propagation of the STWPs is compared with that of Gaussian wave packets of the same transverse spatial width and bandwidth. We establish a theoretical model that accounts for the key factors limiting the STWP propagation distance and suggests a path to further extending it.
Source: Journal of Optics
Institutions: University of Central Florida, University of Utah
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,325
Funder: Office of Naval Research
Awards: G141174884, G1851310322
OpenAlex ID: W4297677890