  We present a technique for the single-shot measurement of the space- and
time-resolved spatiotemporal amplitude and phase of an ultrashort laser pulse.
The method, transient-grating single-shot supercontinuum spectral
interferometry (TG- SSSI), is demonstrated by the space-time imaging of short
pulses carrying spatiotemporal optical vortices (STOVs). TG-SSSI is well-suited
for characterizing ultrashort laser pulses that contain singularities
associated with spin/orbital angular momentum or polarization.
