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12 April 2021 Experimental demonstration of spectrally recycled space-time wave packets
Layton A. Hall, Ayman F. Abouraddy
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Proceedings Volume 11724, Laser Technology for Defense and Security XVI; 1172406 (2021) https://doi.org/10.1117/12.2587821
Event: SPIE Defense + Commercial Sensing, 2021, Online Only
Abstract
‘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 and 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
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KEYWORDS
Beam propagation method
Light wave propagation
Spatial frequencies
Wave propagation
Diffraction
Dispersion
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