title: Diffraction-free propagation of a focused delta-pulsed beam.
abstract: The propagation of short broadband pulses in a homogeneous medium is analyzed on the basis of the wave equation and in the parabolic approximation of that equation. It is shown that the diffraction spreading of a focused optical pulsed beam does not occur in the limiting case of a δ pulse.
authors.affiliation: Zuev Institute of Atmospheric Optics, Siberian Branch of the Russian Academy of Sciences, 1 Akademik Zuev Square, Tomsk 634021, Russia. banakh@iao.ru
authors.forename: V A
authors.initials: VA
authors.lastname: Banakh