Fig. 6: Spectral analysis.
From: Nondiffracting supertoroidal pulses and optical “Kármán vortex streets”
Plane wave spectra of an STP (a1) and a NDSTP (b1), and corresponding projections into the kz-ω/c plane (a2, b2). The light cone is represented by the blue surface in (a1, b1) and the blue lines in (a2, b2). The parameters of the STP and NDSTP are the same as the ones in Fig. 3a, b).
