Effect of environmental media on ablation rate of stainless steel under femtosecond laser multiple raster scans

作     者：崔泽琴 黎颖奇 王文先 林振祥 许并社 

作者机构：College of Material Science and EngineeringTaiyuan University of Technology Key laboratory of Interface Science and Engineering in Advanced Materials of Ministry of Education Department of Mechanical and Aerospace EngineeringMissouri University of Science and TechnologyRollaMO 65409USA 

出 版 物：《Chinese Optics Letters》 (中国光学快报（英文版）)

年 卷 期：2015年第13卷第1期

页      面：53-58页

核心收录：

学科分类：0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 0702[理学-物理学] 

基　　金：supported by the National Natural Science Foundation of China under Grant No.51305292 

主　　题：Ablation Laser ablation Morphology Surface morphology Ultrafast lasers 

摘      要：We investigate the influence of environmental media on ablation rate of AISI 443 stainless steel under femtosecond （fs） laser single raster scan and multiple raster scans in air, water, and methanol. Meanwhile, the development of ablation rate with the change of fs laser-induced surface morphology in the three environmental media is comparatively studied. The results show that environmental media as well as fs laser-induced morphology control the ablation rate with the increasing number of raster scans （N）. Under single raster scanning （N = 1）, the ablation rate is higher in liquid than in air due to the confinement of plasma, laser-induced shockwaves, and bubble-related mechanical forces. However, under multiple raster scans, the variation in ablation rate with the increase in N in these three environmental media is complicated and is largely determined by the surface morphology induced by previous fs laser ablation. When N 〉 20, the ablation rate is much higher in air than in liquids due to preferential ablation caused by the formation of nanostructures-textured mound-shaped microstructures in air. Besides, the redeposition of ejected ablated materials is also an important factor that affects the ablation depth.