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Today's high-power laser systems are capable of reaching photon intensitiesup to $10^{22}$ W/cm^2, generating plasmas when interacting with material. Thehigh intensity and ultrashort laser pulse duration (fs) make direct observationof plasma dynamics a challenging task. In the field of laser-plasma physics andespecially for the acceleration of ions, the spatio-temporal intensitydistribution is one of the most critical aspects. We describe a novel methodbased on a single-shot (i.e. single laser pulse) chirped probing scheme, takingnine sequential frames at framerates up to THz. This technique, to which werefer as temporally resolved intensity contouring (TRIC) enables single-shotmeasurement of laser-plasma dynamics. Using TRIC, we demonstrate thereconstruction of the complete spatio-temporal intensity distribution of ahigh-power laser pulse in the focal plane at full pulse energy with subpicosecond resolution.

Temporally Resolved Intensity Contouring (TRIC) for characterization of  the absolute spatio-temporal intensity distribution of a relativistic,  femtosecond laser pulse