激光直接书写快速制备虹彩与彩色复合图案  

Rapid Preparation of Iris and Color Composite Patterns by Laser Direct Writing

作　　者：彭笛 王大政 张国伟 Peng Di;Wang Dazheng;Zhang Guowei(College of Light Industry Science and Engineering,Tianjin University of Science and Technology,Tianjin 300457,China)

机构地区：[1]天津科技大学轻工科学与工程学院,天津300457

出　　处：《中国激光》2024年第12期97-103,共7页Chinese Journal of Lasers

摘　　要：利用纳秒级光纤激光器直接书写的方式实现了304不锈钢板表面超高效虹彩结构的构建,其速度可达到5 mm^(2)/s以上。通过改变激光能量参数,得到了激光诱导金属表面虹彩结构特定形成的工艺范围。实验分析得出,改变参数,使得每次脉冲形成的熔池边界间距满足布拉格条件,可使这种微观结构出现虹彩现象。同时,利用特定工艺直接构建了一种具有光栅衍射虹彩、薄膜干涉结构色及固有色的复合结构,这种结构可在不同的角度下实现三种颜色交替主导的色彩表现,这也为金属表面的个性化着色提供了新方案。Objective This study explores the utilization of laser technology to alter the surface structure of metals,producing rainbow-colored effects.Beyond aesthetic purposes,this method has potential applications in data storage and anti-counterfeiting measures.Laser modification of metal surfaces presents several advantages over alternative techniques:reduced processing time,user-friendly operations,rapid molding speeds,durable structures,and an environmentally-friendly process that produces no pollutants.However,present strategies for creating rainbow structures suffer from sluggish laser scanning rates,leading to slower molding speeds.Many of these approaches rely on laser polarization and interference,which produce relatively basic patterns.Storing intricate data requires multiple scanning passes.To address these challenges,this study employs nanosecond lasers to inscribe grating patterns directly onto stainless-steel surfaces,generating vibrant rainbow hues.A comprehensive statistical analysis is conducted to examine the influence of factors,such as laser power,scanning speed,scanning interval,and repetition frequency,on the shape transformations of the samples.By melding a range of rainbow effects,insights into the laser interaction with stainless-steel surfaces are obtained.Through systematic parameter adjustments,the mechanisms behind laser-induced rainbow coloration on stainless-steel surfaces are identified.Then,a composite structure,which combines grating diffraction rainbow hues,thin-film interference color,and the metal inherent color,is developed.This composite showcases a dynamic dominant color shift among its three colors,depending on the viewing angle.This investigation offers valuable insights for potential industrial implementations,seeks to enhance molding efficiency,and introduces innovative solutions for custom metal surface coloration.Methods In this study,the relationship among the scanning speed,scanning interval,and repetition frequency is investigated to improve the molding speed.The variation

关 键 词：激光技术 激光光学 表面结构 激光直接书写 结构色 

分 类 号：O436[机械工程—光学工程]