The experimental results of multiphoton electron emission from Cu and W induced by 2-eV 100-fs laser pulses with $s$ and $p$ polarizations at incidence angles between 0° and 85° and different intensities are reported. The data show a third-order nonlinear photoemission process for Cu and a fourth-order behavior for W. For both metals the electron emission is higher for the polarization in the incidence plane, with a maximum value at the pseudo-Brewster angle, while the electron yield as a function of the incidence angle exhibits an unambiguous dependence on the bulk absorption coefficient and it can be accounted for on the basis of the Fresnel equations.

• Received 27 March 1996

DOI:https://doi.org/10.1103/PhysRevB.54.6031