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We study photoionization of cold rubidium atoms in a strong infrared laserfield using a magneto-optical trap (MOT) recoil ion momentum spectrometer.Three types of cold rubidium target are provided, operating in two-dimension(2D) MOT, 2D molasses, and 3D MOT with densities in the orders of $10^7$atoms/cm$^3$, $10^8$ atoms/cm$^3$, and $10^9$ atoms/cm$^3$, respectively. Thedensity profile and the temperature of 3D MOT are characterized using theabsorption imaging and photoionization. The momentum distributions of Rb$^+$created by absorption of two- or three-photon illuminate a dipole-likedouble-peak structure, in good agreement with the results in the strong fieldapproximation. The yielding momentum resolution of $0.12 \pm 0.03$ a.u. isachieved in comparison with theoretical calculations, exhibiting the greatprospects for the study of electron correlations in alkali metal atoms throughinteraction with strong laser pulses.

Recoil-ion momentum spectroscopy of photoionization of cold rubidium atoms in a strong laser field