Collaborative Research: A Novel Dual-Pulse Laser Ablation and Plasma Amplification (LAPA) Process for Drilling Non-straight Holes with Arbitrarily Varying Diameters

合作研究：用于钻任意不同直径的非直孔的新型双脉冲激光烧蚀和等离子体放大 (LAPA) 工艺

• 批准号: 1300930
• 负责人: Yung Shin
• 金额: $ 14.46万
• 依托单位: Purdue University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-06-01 至 2016-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1300930&HistoricalAwards=false
• 关键词: Collaborative; Research; Novel; Dual; Pulse

This grant provides funding to study a novel dual-pulse laser ablation and plasma amplification (LAPA) process for drilling non-straight microholes with diameters varying arbitrarily with depth. Such kinds of microholes have been increasingly needed by many important applications. However, their precise and efficient drilling still remains a big challenge. The research objectives are to (1) test the hypothesis that in LAPA the amplification of nanosecond-laser-generated plasma by a second picosecond laser pulse can realize controlled and precise material removal from a microhole sidewall through plasma-sidewall interactions and (2) understand the fundamental physics associated with LAPA. The specific research tasks include: (1) Establish an experimental set-up for LAPA. (2) Establish theoretical models for LAPA, which can simulate laser ablation and plasma generation, and laser-plasma-sidewall interactions. (3) Measure the plasma properties to verify the models and understand the fundamental physical processes in LAPA. (4) Perform a feasibility experimental study under the guidance of the verified models. The pump-probe, fast imaging and emission spectroscopy techniques will be used in plasma property measurements. The nonlinear Schrödinger equation and two-temperature hydrodynamic equations will be solved and coupled with a molecular dynamics/Monte Carlo module in modeling the laser-plasma-hole sidewall interactions during LAPA. LAPA is a novel manufacturing process proposed by the PI. Its essential physical process is the interaction among picosecond laser pulse, plasma (generated by a prior nanosecond laser pulse), and microhole sidewall, which has been rarely studied and is still poorly understood. This project will provide a good, fundamental understanding of this interaction by combining multiscale modeling with comprehensive experiments. The research work will build a solid scientific foundation crucial for LAPA's practical applications. It will also improve our understanding of laser-plasma-material interactions in the general sense, which may improve other existing or inspire new laser and/or plasma-assisted manufacturing processes.

该补助金提供资金，用于研究一种新型的双脉冲激光烧蚀和等离子体放大（LAPA）工艺，用于钻制直径随深度任意变化的非直微孔。这种类型的微孔已经越来越多地被许多重要的应用所需要。然而，精确和高效的钻探仍然是一个巨大的挑战。本研究的主要目的是：（1）验证LAPA中纳秒激光产生的等离子体通过第二皮秒激光脉冲的放大可以通过等离子体-侧壁相互作用从微孔侧壁实现受控和精确的材料去除的假设;（2）了解LAPA的基本物理。具体的研究任务包括：（1）建立LAPA的实验装置。(2)建立了LAPA的理论模型，可以模拟激光烧蚀和等离子体产生，以及激光-等离子体-侧壁相互作用。(3)通过测量等离子体特性来验证模型，并了解LAPA中的基本物理过程。(4)在验证模型的指导下进行可行性实验研究。 泵浦-探测、快速成像和发射光谱技术将用于等离子体性质的测量。非线性薛定谔方程和双温流体动力学方程将被求解，并与分子动力学/Monte Carlo模块耦合，模拟LAPA过程中的激光-等离子体-空穴侧壁相互作用。 LAPA是PI提出的一种新型生产工艺。 它的基本物理过程是皮秒激光脉冲、等离子体（由先前的纳秒激光脉冲产生）和微孔侧壁之间的相互作用，这一过程很少被研究，并且仍然知之甚少。这个项目将提供一个很好的，这种相互作用的基本理解相结合的多尺度建模与综合实验。这项研究工作将为LAPA的实际应用奠定坚实的科学基础。它还将提高我们对激光-等离子体-材料相互作用的一般意义上的理解，这可能会改善其他现有的或启发新的激光和/或等离子体辅助制造工艺。