  We present a novel, straightforward method for spatiotemporal
characterization of ultra-short laser pulses. The method employs far-field
interferometry and inverse Fourier transform spectroscopy, built on the
theoretical basis derived in this paper. It stands out in its simplicity: it
requires few non-standard optical elements and simple analysis algorithms. This
method was used to measure the space-time intensity of our 100 TW class laser
and to test the efficacy of a refractive doublet as a suppressor of pulse front
curvature (PFC). The measured low-order spatiotemporal couplings agreed with
ray-tracing simulations. In addition, we demonstrate a one-shot measurement
technique, derived from our central method, which allows for quick and precise
alignment of the compressor by pulse front tilt (PFT) minimization and for
optimal refractive doublet positioning for the suppression of PFC.
