激光器
飞秒
超短脉冲
平面的
材料科学
信号处理
光学
跟踪(教育)
光学(聚焦)
声发射
材料加工
计算机科学
信号(编程语言)
光电子学
声学
数字信号处理
计算机硬件
工程类
物理
计算机图形学(图像)
复合材料
心理学
教育学
程序设计语言
制造工程
作者
Yanzhe Fu,Shu‐Li Yao,Wei Jia,Bing Wang,Jiebo Li
摘要
Auto-focusing technology in ultrafast laser processing, especially for non-planar structures, holds paramount importance. The existing methodologies predominantly rely on optical mechanisms, thereby being limited by the original system and material reflectivity. This work proposes an approach that utilizes laser-induced sound as a feedback signal for system control, thereby circumventing the need for optical system adjustments and facilitating almost real-time tracking. We established an ultrafast laser processing system augmented by acoustic emission technology, allowing for focus tracking on inclined planes. This system also exhibits the capability to generate diverse microscopic morphologies, including grooves and differently oriented laser-induced periodic surface structures (LIPSS), through the manipulation of the acoustic signal threshold. This method can be easily integrated into existing laser processing systems, offering new capabilities for curved surface processing, microstructure manufacturing, and transparent material processing.
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