X-ray tomography of polarization effects on deep laser-machined microgrooves

IF 6.1 1区 工程技术 Q1 ENGINEERING, MANUFACTURING
Ce Xiao , Jean-Yves Buffiere , Arnaud Weck
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引用次数: 0

Abstract

Ultrafast laser machining has been researched extensively over the last few decades to create features such as holes in a variety of materials. The effects of laser parameters including power and polarization on the dynamics of hole formation and resulting hole geometry have been studied. Grooves formation, especially deep ones, on the other hand, has not attracted as much attention, even though grooves are essential to most laser cutting operations. One aspect limiting the study of deep machined features such as grooves is the difficulty in imaging not only the geometry but also the associated collateral damage produced in the material during machining. Here, we employed x-ray tomography for three-dimensional imaging of deep ultrafast laser-machined grooves in various metals. The 3D images of the deep grooves were quantitatively analyzed, revealing the significant effect of laser polarization on groove morphology. Under rotating polarization (also called “scrambled polarization” or “polarization trepanning”), the deep grooves are smooth and uniform, while under linear polarization, extensive branching is observed along the groove, and becomes more pronounced with increasing laser energy and groove entrance length. A mechanistic picture based on laser light reflection off the groove walls is proposed to qualitatively explain the polarization-dependent groove branching observed experimentally. These findings provide new insights into high-precision deep groove laser machining, highlighting the effectiveness of x-ray tomography as a powerful tool for in-depth three-dimensional studies of laser machining processes.
深激光加工微沟槽偏振效应的x射线层析成像
在过去的几十年里,人们对超快激光加工进行了广泛的研究,以在各种材料中制造孔洞等特征。研究了功率和偏振等激光参数对孔洞形成动力学和孔洞几何形状的影响。另一方面,沟槽的形成,特别是深沟槽的形成,并没有引起那么多的关注,尽管沟槽对于大多数激光切割操作是必不可少的。限制深加工特征(如沟槽)研究的一个方面是,不仅难以成像几何形状,而且难以成像加工过程中材料中产生的相关附带损伤。在这里,我们使用x射线断层扫描对各种金属的超快激光加工深槽进行三维成像。对深沟槽的三维图像进行了定量分析,揭示了激光偏振对沟槽形貌的显著影响。旋转极化(也称为“乱置极化”或“极化凿孔”)下,深沟槽光滑均匀,而线性极化下,沿沟槽有广泛的分支,且随着激光能量的增加和沟槽入口长度的增加分支更加明显。提出了一种基于激光反射槽壁的机理图,定性地解释了实验观察到的与偏振相关的槽分支现象。这些发现为高精度深槽激光加工提供了新的见解,突出了x射线断层扫描作为激光加工过程深入三维研究的有力工具的有效性。
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来源期刊
Journal of Manufacturing Processes
Journal of Manufacturing Processes ENGINEERING, MANUFACTURING-
CiteScore
10.20
自引率
11.30%
发文量
833
审稿时长
50 days
期刊介绍: The aim of the Journal of Manufacturing Processes (JMP) is to exchange current and future directions of manufacturing processes research, development and implementation, and to publish archival scholarly literature with a view to advancing state-of-the-art manufacturing processes and encouraging innovation for developing new and efficient processes. The journal will also publish from other research communities for rapid communication of innovative new concepts. Special-topic issues on emerging technologies and invited papers will also be published.
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