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脉冲激光束在低真空(约2Pa)环境下聚焦到高纯Zn靶表面,烧蚀区域不仅有中心深孔的宏观损伤,而且还发现大量微米量级的类似足球形状的金属Zn球体结构附着生长在孔洞内侧表面.实验过程中采用等离子体光谱诊断技术研究宏观和微观损伤对后续脉冲激光的影响程度.与聚焦于金属Zn平滑表面相比,宏观损伤可以使后续激光诱导的Zn原子334.5nm谱线强度提高10.3%,在此基础上大量Zn微米球体附着在内表面可以使谱线强度再提高34.3%.因此,推断这些金属Zn微球表面镶嵌着光洁的纳米量级六边形和五边形小平面,可以对后续脉冲激光产生镜面反射,使得激光能量汇聚并耦合增强,提高烧蚀效率.实验结果还表明,这些微米球体的数目随着激光脉冲次数的增加而增多,使得后续激光能够诱导产生更为致密高温的等离子体.研究结果有望为激光-金属微孔技术提供新思路.
The pulsed laser beam focused on the surface of highly pure Zn target under low vacuum (about 2 Pa). The ablated region not only had macroscopic damage of the center deep hole, but also found that a large number of micron-sized football-like metallic Zn spheres adhered and grew In the inner surface of the hole, plasma spectroscopy was used to study the influence of macroscopic and microscopic damage on the subsequent pulsed laser.Compared with the smooth Zn metal surface, the macroscopic damage can make the subsequent laser-induced 334.5nm Zn atom Line intensity increased by 10.3%, on the basis of a large number of Zn microspheres attached to the inner surface can make the spectral line intensity increased by 34.3% .Therefore, we infer that these metal Zn microspheres inlaid with a smooth nano-scale hexagonal and pentagonal Shaped facets can mirror the subsequent pulsed laser light to make the laser energy converge and enhance and improve the ablation efficiency.The experimental results also show that the number of these microspheres increases with the increase of the number of laser pulses so that the subsequent laser can Induced more dense high temperature plasma.The results of the study are expected to provide new ideas for laser-metal microporous technology.