A Versatile Two-Colour Pulse Generation Setup With Active Feedback Phase-Locking

We present a technique for generating phase-locked two-colour pulses with controllable electric field waveform, whereby the polarization states of the two frequency components, as well as their intensities, relative phase and pulse delay can be completely controlled. To characterize the phase stability and the waveform of the output two-colour pulse in situ, we measured the momentum spectra of protons from dissociative ionization of the hydrogen molecule for different combinations of polarizations.