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Spectral meta-moments reveal hidden signatures of vortex pulses

By Max Liebmann, Alexander Treffer, Martin Bock, Thomas Seiler, Jürgen Jahns, Thomas Elsaesser and Ruediger Grunwald

Abstract

Ultrashort vortex pulses possess specific spatio-spectral signatures due to Gouy phase shift. Helical movement of anomalies around the phase singularity was found which is referred to as spectral Gouy rotation. The analysis of spectral moments allows for identifying related characteristic patterns even in weakly modulated spectral maps. Radial meta-moments from polar projections deliver information on global spectral gradients and oscillatory behavior. The particular mathematical tools could also be applied to other fields of ultrafast spectroscopy

Publisher: EDP Sciences
DOI identifier: 10.1051/epjconf/201920501005
OAI identifier: oai:edpsciences.org:dkey/10.1051/epjconf/201920501005
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