Butkus Simas, Jukna Vytautas, Kažukauskas Evaldas, Svirksas Žilvinas, Paipulas Domas, Sirutkaitis Valdas
Laser Research Center, Vilnius University, Sauletekio Av. 10, LT-10223 Vilnius, Lithuania.
Micromachines (Basel). 2023 Jan 12;14(1):194. doi: 10.3390/mi14010194.
The marking and surface structuring of various materials is important in various industrial fields such as biomaterials, luxury goods, anti-counterfeiting, automotive and aerospace, electronics and semiconductor industries, and others. Recent advances in laser technology, such as burst-mode lasers, have opened new ways of affecting the surfaces of various materials, inducing a different appearance and/or properties of the laser-exposed areas. From earlier studies, it is known that when splitting a single pulse into multiple pulses and thus creating a quasi-MHz-GHz repetition rate regime, it is possible to increase not only the ablation efficiency but it also provides the possibility to tune the heat in-flow into the surface. Such new regimes enable the control of the surface roughness as well as the optical properties and corrosion resistance. In this work, we analyze the effect of the different burst-mode regimes for the marking of stainless-steel samples, aiming to produce high-contrast marking having different shades of black/white color (black-gray-white). Moreover, we investigate the angular dependence of the reflected light after laser treatment numerically from the measured surface morphology.
各种材料的标记和表面结构化在生物材料、奢侈品、防伪、汽车与航空航天、电子与半导体等多个工业领域中都很重要。激光技术的最新进展，如脉冲串模式激光器，为影响各种材料的表面开辟了新途径，可使激光照射区域呈现出不同的外观和/或特性。从早期研究可知，当将单个脉冲分割成多个脉冲从而形成准兆赫兹-吉赫兹重复频率模式时，不仅可以提高烧蚀效率，还能够调节流入表面的热量。这种新模式能够控制表面粗糙度以及光学性能和耐腐蚀性。在这项工作中，我们分析了不同脉冲串模式对不锈钢样品标记的影响，旨在制作具有不同黑白颜色深浅（黑-灰-白）的高对比度标记。此外，我们根据测量的表面形态，对激光处理后反射光的角度依赖性进行了数值研究。
