Next-Generation Ultrafast Laser Processing and Micromachining: Integrating Research with Practice

高功率超快激光器为下一代激光材料加工提供了显著的优势，特别是在小尺寸范围内，这使得它们非常适合于微机械加工和MEMS结构。与超快激光相关的极高激光强度导致了独特的非线性激光-材料相互作用，为激光-材料加工提供了创新的新可能性。该提案提出了一系列统一的研究任务，既解决了基本的科学问题，又提出了现实世界应用的实用技术和解决方案。建议的任务包括1)用于将高质量、最小失真的超快激光光束传输到工件以进行加工而不需要真空室的新型光束传输技术，2)透明材料的亚表面加工，其中特征可以在透明材料的表面下进行真正的三维微加工，3)建立击穿和材料去除模型以预测特定材料在特定超快激光参数下的响应和去除率，以及4)针对MEMS应用的新型材料的精密加工，如SU-8，它具有与传统制造相比的独特能力。研究任务的一个中心重点是既提供基本的理解，同时为工业和其他现实世界的用户提供实用知识。作为研究生和本科生的教育工具，该项目将在微观尺度(时间和空间)提供光学、激光和工程学方面的出色培训。在传统的机械工程课程中，这些主题通常只涉及最少的内容，如果有的话，这个项目将在这些领域提供急需的培训。

High-power ultrafast lasers offer significant advantages for next-generation laser materials processing, particularly at small length scales, which makes them well suited for micromachining and MEMS structures. The extremely high laser intensities associated with ultrafast lasers result in unique, nonlinear laser-material interactions that provide innovative new possibilities for laser-material processing. This proposal presents a unified series of research tasks that address both fundamental scientific issues while presenting practical techniques and solutions for real-world applications. The proposed tasks include 1) novel beam delivery techniques for delivering a high-quality, minimal distortion ultrafast laser beam to a workpiece for processing without the need for a vacuum chamber, 2) sub-surface machining of transparent materials in which features can be fabricated underneath the surface of transparent materials for true three-dimensional micromachining, 3) modeling breakdown and material removal to predict a given material's response and removal rates from specific ultrafast laser parameters, and 4) precision processing of novel materials such as SU-8 for MEMS applications, which presents unique capabilities over traditional manufacturing. A central focus of the research tasks is to provide both fundamental understanding while at the same time providing practical knowledge for industrial and other real-world users. As an educational tool for both graduate and undergraduate students, the project will provide excellent training in optics, lasers, and engineering on the microscale (both time and space). These topics are often only minimally covered, if at all, in traditional mechanical engineering programs, and this project will provide much needed training in these areas.