“…In comparison to well-established methods for the measurement of the pulse-to-pulse evolution of the waveform under the intensity envelope, like e.g., f-2f interferometry [4] or above-threshold ionization [59] for characterizing the electric field on a shot-to-shot basis, the signal scales linearly with the characterized field and does not require additional steps of spectral broadening, which add noise. Contrary to recent investigations on the phase noise of waveforms generated via IPDFG with a shot-noise limited source [60,61], temporal jitter of the pulse envelope is not considered here, because the gate pulse, derived from the same source in the experiments presented here, acts as a temporal reference. Furthermore, temporally chirping the infrared waveform allows for a wavelength-dependent analysis of the waveform stability.…”