Data for: "Photoelectron interferometry with spectrally shaped polychromatic infrared pulses"

Data were collected using laser-assisted photoelectron interferometry in helium. Extreme-ultraviolet (XUV) attosecond pulse trains were generated by high-order harmonic generation in argon using a Ti:sapphire laser. A synchronized infrared (IR) probe field was shaped using a 4f pulse shaper to produce five narrow spectral components arranged as a Golomb ruler in the frequency domain. The XUV and IR pulses were overlapped in a helium gas jet, and the kinetic energies of the emitted photoelectrons were measured using a two-metre-long magnetic-bottle electron spectrometer. Scanning the relative delay between the pulses produced photoelectron spectrograms as a function of energy and time delay. The spectrograms were analysed using Fourier transforms along the delay axis and fitting of oscillatory components to extract interference frequencies, amplitudes and phases. Measured IR spectra were used to normalize the extracted amplitudes for the spectral amplitudes of the probe field.