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Broadband space-time wave packets propagating 70 m

Abstract

The propagation distance of a pulsed beam in free space is ultimately limited by diffraction and space-time coupling. “Space-time” (ST) wave packets are pulsed beams endowed with tight spatio-temporal spectral correlations that render them propagation-invariant. Here we explore the limits of the propagation distance for ST wave packets. Making use of a specially designed phase plate inscribed by gray-scale lithography and having a laser-damage threshold of 0.5J/cm2, we synthesize a ST light sheet of width 700μm and bandwidth 20nm, and confirm a propagation distance of 70m.

© 2019 Optical Society of America

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