Fig. 4
From: Ultrafast bursts of tailored spatiotemporal vortex pulses
Burst of spatiotemporal vortex pulses with time-varying chirality alternating between ℓ = +1 and ℓ = −1. a Measured iso-intensity profile. The isovalue is set to 11% of the peak intensity. b Retrieved phase in the meridional plane. c Complex field and energy density flux (calculated with \({\beta }_{2}=-{k}_{0}^{-1}\), see Supplementary Note 3 and Note 5) of pulse burst in the space-time domain, reminiscent of the KVS featured temporal variation of chirality of T-OAM. The values at the top denote the mean value of the T-OAM \(\left\langle {L}_{y}\right\rangle\) per photon for each comb teeth. The saturation and hue denote amplitude and phase information respectively
