  Attosecond transient absorption spectroscopy has thus far been lacking the
capability to simultaneously characterize the intense laser pulses at work
within a time-resolved quantum-dynamics experiment. However, precise knowledge
of these pulses is key to extracting quantitative information in strong-field
highly nonlinear light-matter interactions. Here, we introduce and
experimentally demonstrate an ultrafast metrology tool based on the
time-delay-dependent phase shift imprinted on a strong-field driven resonance.
Since we analyze the signature of the laser pulse interacting with the
absorbing spectroscopy target, the laser pulse duration and intensity are
determined in situ. As we also show, this approach allows for the
quantification of time-dependent bound-state dynamics in one and the same
experiment. In the future, such experimental data will facilitate more precise
tests of strong-field dynamics theories.
