  Accurate and fast characterization of spatiotemporal information of
high-intensity, ultrashort pulses is crucial in the field of strong-field laser
science and technology. While conventional self-referenced interferometers were
widely used to retrieve the spatial profile of the relative spectral phase of
pulses, additional measurements of temporal and spectral information at a
particular position of the laser beam were, however, necessary to remove the
indeterminacy, which increases the system complexity. Here we report an
advanced, dual-functional interferometer that is able to reconstruct the
complete spatiotemporal information of ultrashort pulses with a single scan of
the interferometer arm. The set-up integrates an interferometric
frequency-resolved optical gating (FROG) with a radial shearing Michelson
interferometer. Trough scanning one arm of the interferometer, both
cross-correlated FROG trace at the central part of the laser beam and
delay-dependent interferograms of the entire laser profile are simultaneously
obtained, allowing a fast 3-dimensional reconstruction of few-cycle laser
pulses.
