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Quantum efficiency studies for various wavelength and various technical metalsurfaces were carried out in a dedicated unbaked vacuum chamber. Copper,magnesium, aluminium and aluminium-lithium photocathodes were irradiated by twodifferent high power, high repetition rate, laser systems. We have observed anemission of electrons for photon energy below the work function of thematerial. This is explained by multiple photon absorption at the photocathode.We have not observed any degradation of the QE for those materials, but animprovement when irradiating them over a long period of time. This is contraryto observations made in RF photoguns.

Quantum efficiency of technical metal photocathodes under laser irradiation of various wavelength