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The speed of ultra-fast optical switches is generally limited by theintrinsic electronic response time of the material. Here we show that the phasecontent of selected electromagnetic pulses can be used to measure thetimescales characteristic for the different regimes of matter-lightinteractions. By means of combined single cycle THz pumps and broadband opticalprobes, we explore the field-induced opacity in GaAs (the Franz-Keldysheffect). Our phase-resolved measurements allow to identify a novel quasi-staticregime of saturation where memory effects are of relevance.

Mixed regime of light-matter interaction revealed by phase sensitive measurements of the dynamical Franz-Keldysh effect