论文部分内容阅读
Dense arrays of micro-columns are formed on the surface of Ti-Al alloy by cumulative nanosecond pulsed laser ablation in water.The fabric-like structure characterized by Ti-Al nano-spheres absorbed on micro-cluster in liquid is most likely responsible for the occurrence of laser micro-etching and localized melting,resulting in continuous deepening of micro-holes and the formation of micro-columns.Laser induced plasma spectroscopy is carried out to reveal the effect of micro-columns on subsequent pulse laser ablation.The intensity of spectral lines from Ti ions by additional laser ablation of the modified spot is higher than that created over a smooth surface.These results suggest that the micro-columns lead to an enhanced absorption of the following laser energy.The proposed results and relevant discussions are of importance for the development of light-trapping coatings on a metal surface.