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Surface Probing of Ultra‐Short‐Pulse Laser Filament Cut Window Glass and the Impact on the Separation Behavior
Advanced Engineering Materials ( IF 3.6 ) Pub Date : 2020-06-22 , DOI: 10.1002/adem.202000471
Ferdinand Werr 1 , Alexander Veber 1 , Martin Brehl 1 , Michael Bergler 1 , Dirk Werner 2 , Urs Eppelt 3 , Ludger Müllers 3 , Dominique de Ligny 1
Affiliation  

The process of laser filament cutting produces a practical nongap cut which ensures high precision in lateral dimensions at the micrometer scale. Commercially available OptiWhite soda lime silicate glass is filamented using a 1064 nm picosecond pulsed Nd:YAG laser with varying burst energies and focus positions. The filaments are characterized perpendicular to the incident laser beam using scanning electron microscopy (SEM). Maximum roughness Rz evaluated with laser scanning microscopy is measured on the cut sides. The characteristic mechanical strength σ of glass cleavage is decreased by a factor of 6 with the presence of the filaments. This σ obtained in the four‐point‐bending setup decreases with the increase in energy deposited in the material by the laser. It is found that the cleaving cracks are guided by the filament only if the network of microcracks is sufficiently developed. A threshold of the cleaving guidance is linked to a critical surface modification width of 2.5 μm which corresponds to half the distance between filaments. The influences of the laser parameters, sample thickness, and sample position in respect of the focal plane on the cut quality are studied. Guidelines are given to define a suitable parameter set.

中文翻译:

超短脉冲激光丝切割窗玻璃的表面探测及其对分离行为的影响

激光灯丝切割过程可产生实用的无间隙切割,从而确保了微米级横向尺寸的高精度。使用1064 nm皮秒脉冲Nd:YAG激光对市售的OptiWhite钠钙硅酸盐玻璃进行细丝化处理,并具有不同的猝发能量和聚焦位置。使用扫描电子显微镜(SEM)对长丝垂直于入射激光束进行表征。在切割面上测量用激光扫描显微镜评估的最大粗糙度R z。在存在细丝的情况下,玻璃解理的特征机械强度σ降低了6倍。这个σ随着激光在材料中沉积的能量的增加,在四点弯曲设置中获得的能量会降低。发现只有在微裂纹网络充分发展的情况下,劈裂裂纹才由细丝引导。劈裂引导的阈值与2.5μm的临界表面改性宽度有关,该临界表面改性宽度对应于细丝之间的距离的一半。研究了激光参数,样品厚度和相对于焦平面的样品位置对切割质量的影响。给出了定义合适参数集的准则。
更新日期:2020-06-22
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