Abstract
Experimental results are presented on laser ablation of brass in liquid environment (e.g., ethanol and water) by radiation of either a copper vapor laser (wavelength of 0.51 μm) or a pulsed Nd:YAG laser (1.06 μm). In a certain range of laser parameters (fluence and number of laser shots) the surface consists of regular micro-cones. The period of micro-cones is about 30 μm and depends on the laser fluence. The composition of micro-cones (Cu/Zn ratio) differs from that of the initial surface. The ablated material is ejected into surrounding liquid in the form of nanoparticles with average size of 20 nm. The composition of nanoparticles depends on the nature of the liquid. For instance, ablation in ethanol results in formation of core-shell nanoparticles. The results are discussed on the basis on phase diagram of brass.
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