Speaker
Description
There has been significant interest in generating orbital angular momentum (OAM) pulse pairs at free-electron lasers, either through direct OAM seeding schemes or via harmonic emission in helical undulators. In such schemes the pulses are temporally separated; while coherent superpositions of OAM modes can be identified from their transverse interference patterns, this approach fails when the pulses do not overlap in time. Here we present a spatially resolved spectral method that addresses this need, demonstrating that topology-dependent signatures are recovered by measuring the spectrum across selected regions of the transverse beam profile. We show that appropriate spatial filtering schemes can be identified for pulse pairs of different topological charge combinations.
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