Laser-processing of grinded and mechanically abraded Nb-surfaces

V. Porshyn, P. Rothweiler, D. Lützenkirchen-Hecht
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引用次数: 0

Abstract

The effect of pulsed laser polishing on rough niobium surfaces was investigated. We created different well-defined roughness profiles with standard emery papers and subsequently remelted random surface areas with a size of about 2x2 mm^2 with nanosecond laser pulses (wavelength of 1064 nm, pulse length of 10 ns). Pristine as well as laser-treated surfaces were investigated using optical profilometry and atomic force microscopy, and the surface topography was described by means of correlation functions. Uniformly rough and highly smooth surface geometries were achieved for fractals above and below 7 {\mu}m, respectively. Moreover, the behavior of foreign particles during the laser processing was investigated in detail. The polishing procedure was also monitored point by point by detecting electrical signals, i.e., sample charging, which resulted from the intense laser illumination. The measured electrical charges were found to be correlated with the local surface texture. Thus, regions with initially high roughness profiles and regions with extensive laser-induced defects could be directly identified from the detected electrical signals.
研磨和机械研磨铌表面的激光加工
研究了脉冲激光抛光对铌表面粗糙度的影响。我们用标准金刚砂纸创建了不同的明确定义的粗糙度轮廓,随后用纳秒激光脉冲(波长1064 nm,脉冲长度10 ns)重熔了大小约为2x2 mm^2的随机表面区域。利用光学轮廓术和原子力显微镜对原始表面和激光处理表面进行了研究,并用相关函数描述了表面形貌。在7 {\mu}m以上和7 {\mu}m以下的分形分别获得了均匀粗糙和高度光滑的表面几何形状。此外,还详细研究了激光加工过程中外来粒子的行为。抛光过程还通过检测由强激光照射产生的电信号,即样品充电,逐点监测。测量的电荷被发现与局部表面织构相关。因此,最初具有高粗糙度轮廓的区域和具有广泛激光诱导缺陷的区域可以直接从检测到的电信号中识别出来。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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