MULTIPHOTON ELECTRON-EMISSION FROM CU AND W - AN ANGLE-RESOLVED STUDY

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 in cidence angles between 0 degrees and 85 degrees and different intensit ies 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 plan e, with a maximum value at the pseudo-Brewster angle, while the electr on 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.