Related Experiment Video
Updated: May 21, 2026

Blood Flow Imaging with Ultrafast Doppler
Published on: October 14, 2020
Ultrashort highly localized wavepackets
1Max Born Institute for Nonlinear Optics and Short-Pulse Spectroscopy, Max-Born-Strasse 2a, D-12489 Berlin, Germany.
Abstract:
The recently introduced concept of radially non-oscillating, temporally stable ultrashort-pulsed Bessel-like beams we referred to as needle beams is generalized to a particular class of highly localized wavepackets (HLWs). Spatio-temporally quasi-nondiffracting pulses propagating along extended zones are shaped from Ti:sapphire oscillator radiation with a spatial light modulator and characterized with spatially resolved second order autocorrelation. Few-cycle wavepackets tailored to resemble circular disks, rings and bars of light represent the closest approximation of linear-optical light bullets known so far. By combining multiple HLWs, complex pulsed nondiffracting patterns are obtained.
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