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Application of EUV optics to surface modification of materials

We report results of experiments connected with surface modification of materials with an intense extreme ultraviolet (EUV) laser beam. Irradiated by the laser beam from a discharge-plasma EUV source (with wavelength of 46.9 nm) based on a high-current capillary discharge driver, the samples have been investigated by atomic-force microscope (AFM). The laser beam is focused with a spherical Si/Sc multilayer-coated mirror on polymethylmethacrylate (PMMA), gold-covered- PMMA and gallium arsenide (GaAs) samples. It turned out that desorption and ablation regimes, which are observed in all these cases strongly depends on substrate materials.