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‘Space-time’ (ST) wave packets are propagation-invariant pulsed optical beams whose group velocity can take on arbitrary values in free space. Such unique behavior is a consequence of tight spatio-temporal spectral correlations introduced into the field, which in turn results in a correlation between the temporal bandwidth and numerical aperture. Utilizing large temporal bandwidths or creating ultraslow group velocities both require excessively large numerical apertures. We introduce a methodology for spectral recycling that circumvents this obstacle, and confirm experimentally that the unique characteristics of the ST wave packet are retained. Furthermore, we synthesize a ST wave packet having a group velocity of c/14.3 at a low numerical aperture by exploiting spectral recycling.
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Layton A. Hall, Ayman F. Abouraddy, "Experimental demonstration of spectrally recycled space-time wave packets," Proc. SPIE 11724, Laser Technology for Defense and Security XVI, 1172406 (12 April 2021); https://doi.org/10.1117/12.2587821