论文标题
磨的激光处理和机械磨损的NB-Surfaces
Laser-processing of grinded and mechanically abraded Nb-surfaces
论文作者
论文摘要
研究了脉冲激光抛光对粗糙的尼物表面的影响。我们创建了具有标准的Emery纸张的不同定义明确的粗糙度曲线，随后将其尺寸约为2x2 mm^2的随后重新递减的随机表面积，具有纳米秒激光脉冲（波长为1064 nm，脉冲长度为10 ns）。使用光学仪和原子力显微镜研究了原始的和激光处理的表面，并通过相关函数描述了表面形貌。分别在7μm上方和低于7μm的分形方面实现了均匀的粗糙和高光滑的表面几何形状。此外，详细研究了激光处理过程中异物的行为。还通过检测电信号（即样品充电）来监测抛光过程，这是由激光照明产生的。发现测得的电荷与局部表面纹理相关。因此，可以直接从检测到的电信号直接识别具有最初具有较高粗糙度的区域和具有广泛激光引起的缺陷的区域。
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 μm, 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.
