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The Effect of Optical System Design for Laser Micro-hole Drilling Process

机译：光学系统设计对激光微孔加工的影响

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Lasers are a promising high accuracy tool to make small holes in composite or hard material. They offer advantages over the conventional machining process, which is time consuming and has scaling limitations. However, the major downfall in laser material processing is the relatively large heat affect zone or number of molten burrs it generates, even when using nanosecond lasers over high-cost ultrafast lasers. In this paper, we constructed a nanosecond laser processing system with a 532 nm wavelength laser source. In order to enhance precision and minimize the effect of heat generation with the laser drilling process, we investigated the geometric shape of optical elements and analyzed the images using the modulation transfer function (MTF) and encircled energy (EE) by using optical software Zemax. We discuss commercial spherical lenses, including plano-convex lenses, bi-convex lenses, plano-concave lenses, bi-concave lenses, best-form lenses, and meniscus lenses. Furthermore, we determined the best lens configuration by image evaluation, and then verified the results experimentally by carrying out the laser drilling process on multilayer flexible copper clad laminate (FCCL). The paper presents the drilling results obtained with different lens configurations and found the best configuration had a small heat affect zone and a clean edge along laser-drilled holes.
机译：激光是一种有望在复合材料或硬质材料上打小孔的高精度工具。与传统的加工过程相比，它们具有优势，后者既耗时又有缩放比例限制。但是，激光材料加工的主要缺点是相对较大的热影响区或产生的熔融毛刺数量，即使使用纳秒激光而不是高成本的超快激光也是如此。在本文中，我们构建了一个具有532 nm波长激光源的纳秒激光处理系统。为了提高精度并最大程度地减少激光钻孔过程中的热量产生，我们研究了光学元件的几何形状，并使用光学软件Zemax使用调制传递函数（MTF）和环能（EE）分析了图像。我们讨论商用球形透镜，包括平凸透镜，双凸透镜，平凹透镜，双凹透镜，最佳形式的透镜和弯月形透镜。此外，我们通过图像评估确定了最佳的透镜配置，然后通过在多层柔性覆铜箔层压板（FCCL）上进行激光打孔工艺实验验证了结果。本文介绍了使用不同透镜配置获得的钻孔结果，发现最佳配置具有较小的热影响区和沿激光钻孔的边缘干净的边缘。

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