Spectral meta-moments reveal hidden signatures of vortex pulses
1 Max Born Institute for Nonlinear Optics and Short-Pulse Spectroscopy, Max Born Str. 2a, 12489 Berlin, Germany
2 FemUniversität Hagen, Micro- and Nanophotonics, Universitätsstr. 27/PRG, 58097 Hagen, Germany
Published online: 16 April 2019
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.
© The Authors, published by EDP Sciences, 2019
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