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The blooming of attosecond science (1 as = $10^{-18}$ s) has raised the needto exquisitely control the delay between two ultrashort light pulses, one ofthem being intense and in the visible spectral range, while the second is weakand in the Extreme Ultra-Violet spectral range. Here we introduce a robusttechnique, named LIZARD (Laser-dressed IoniZation for the Adjustment of thepump-pRobe Delay), allowing an active stabilization of this pump-probe delay.The originality of the method lies in an error signal calculated from atwo-photon photoelectron signal obtained by photoionizing a gas target in anelectronic spectrometer with the two superimposed beams. The modulation ofsidebands in phase quadrature allows us to perform an \textit{in situ}measurement of the pump-probe phase, and to compensate for fluctuations with anuniform noise sensitivity over a large range of delays. Despite aninterferometer length of several meters, we achieved a long term stability of28 as RMS over hours. This method could be applied to the stabilization ofother types of two-color interferometers, provided that one of the propagatingbeams is capable of photoionizing a target.

In situ sub-50 attosecond active stabilization of the delay between infrared and extreme ultraviolet light pulses