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A bstract Magnetization induced optical second harmonic generation (MSHG) in combination with the magneto-optical Kerr effect (MOKE) was used to study thin Co films and Cu/Co multilayers of thicknesses between 1 and 20 monolayers (M L) grown on a Ou(0 0 1) substrate. From the different dependence of MSHG and MOKE on Co film thickness we get direct in fon nation about the interface sensitivity of MSHG. Modifying the vacuum/Co interface by gas adsorption yields the relative contributions of the vacuum/Co and the Co/Cu(Q01)-substrate interfaces. Both MSHG and MOKE data can be accurately described by a multiple reflection model.

Excitation of a biased GaAs-Au Schottky barrier sample by intense fs laser pulses leads to coherent oscillations that are probed by time-resolved second harmonic generation experiments. The observed oscillations agree very well with the results of MC simulations and appear to be plasma oscillations modified by surface phonons.

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