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Double photo-electron momentum spectra of the Helium atom are calculated\textit{ab initio} at extreme ultra-violet and near infrared wavelengths. Atshort wavelengths two-photon double ionization yields, two-electron energyspectra, and triply differential cross sections agree with results from recentliterature. At the near infrared wavelength of $780\,nm$ the experimentalsingle-to-double ionization ratio is reproduced up to intensities of $4\times10^{14}W/cm^2$, and two-electron energy spectra and joint angular distributionsare presented. The time-dependent surface flux (tSurff) approach is extended tofull 3+3 spatial dimensions and systematic error control is demonstrated. Weanalyze our differential spectra in terms of an experimentally accessiblequantitative measure of correlation.

Double photo-electron momentum spectra of Helium at infrared wavelength