皮秒激光铝合金黑色标刻实验与理论建模分析  

Experimental and Theoretical Modeling Analysis of Picosecond LaserBlack Marking of Aluminum Alloys

作　　者：刘福康 李建美[1] Liu Fukang;Li Jianmei(Key Laboratory of High Efficiency and Clean Machinery Manufacturing of Ministry of Education,School of Mechanical Engineering,Shandong University,Jinan 250061,Shandong,China)

机构地区：[1]山东大学机械工程学院高效洁净机械制造教育部重点实验室,山东济南250061

出　　处：《激光与光电子学进展》2023年第23期211-217,共7页Laser & Optoelectronics Progress

基　　金：山东省重点研发计划(公益类)资助项目(2019GGX104098)。

摘　　要：使用皮秒激光时,通过改变激光标刻参数,可以在铝合金表面得到不同对比度的黑色图案。通过激光扫描显微镜对实验标刻样本表面进行测量,并通过电磁波理论建模对皮秒激光打黑机理进行分析。研究发现,激光标刻样本宏观基体表面存在微纳尺度的最大高度值不同的密集峰谷形貌。样本表面微纳峰谷形貌的最大高度值越大,表面反射率越低,从而形成对比度较大的黑色图案。通过样本灰度值得到的对比度与理论建模得到的对比度几乎一致,这证实上述机理是激光打黑铝合金的主要原因。When using picosecond lasers,black patterns of varying contrasts are obtained on the surface of aluminum alloys by changing the laser marking parameters.In this study,the surface of experimental marking samples is measured using a laser scanning microscope,and the mechanism of picosecond laser blackening is analyzed through the theoretical modeling of electromagnetic waves.Consequently,a dense peak-valley morphology with different maximum height values on the micro-nano scale is formed on the surface of the laser marking samples.The results indicate that a larger maximum height of the micro-nano peak-valley morphology on the sample surface causes a lower surface reflectivity and the formation of black patterns with higher contrasts.Additionally,the contrast obtained using the sample gray value is almost equal to that obtained via theoretical modeling,which proves that the above phenomenon is the main reason for the laser blackening of aluminum alloys.

关 键 词：皮秒激光标刻 黑色图案 反射率 对比度 电磁波 

分 类 号：TN249[电子电信—物理电子学]