ИСТИНА

The recent results of experimental and numerical investigation of relativistic femtosecond laser-plasma interaction are presented. We show that the efficiency of hard X-ray generation and hot electron acceleration may be significantly increased if sub-wavelength scale structured targets are used. The modified targets were made by the laser ablation (fluence slightly over damage threshold) of solids (metals and dielectrics). Varying the regime of interaction and by additional etching in acid solution the periodic structures with different shapes (cones, bubbles, etc) and size (from ~0.1 to ~20 micrometers) could be formed. This method allows creating large area sample, suitable for high repetition rate laser-plasma experiments.