We report measurements of the two‐photon photoemission sensitivity of gold at 496 nm, for three incidence angles of a p‐polarized laser beam, with a 450‐fs pulse duration, produced by a KrF pumped dye laser. The nonlinear growing of the photoelectric efficiency versus the laser peak intensity, in the range of 5–9 GW/cm2, is demonstrated to be consecutive to the thermal nonequilibrium between the electrons and the lattice at the surface of the metal. We also observe with a solid that the single‐photon photoelectric sensitivity, measured by us previously, can be lower than the one for the two‐photon process, when the incident laser intensity is high enough. The crossing point of respective sensitivities for 248‐ and 496‐nm laser radiations is about 5.5×10−6 A/W and corresponds to a laser intensity of about 6.5 GW/cm2. This effect, which can be only observed with ultrashort laser pulses, represents a significant step towards the realization of very high brightness electron beams.