Collaborative Research: Modeling and Analysis of High Energy Ultrashort Laser-Induced Plasmas and Shockwave

合作研究：高能超短激光诱导等离子体和冲击波的建模与分析

• 批准号: 0853528
• 负责人: Benxin Wu
• 金额: $ 15.24万
• 依托单位: Illinois Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-07-01 至 2013-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0853528&HistoricalAwards=false
• 关键词: Collaborative; Research; Modeling; Analysis; Energy

0853528WuThe goal of this project is to develop an understanding of, and ability to control plasma and shock wave formation during high energy, ultrashort laser-solid interaction via modeling and experimentation. In particular, the early plasma that occurs near a solid surface that is irradiated by high energy, ultrashort laser beams will be investigated. A goal is to control the shock wave and plasma properties so that they may be exploited to create novel results such as filament effects, i.e., formation of a plasma chatter that results from the dynamic balance between self-focusing and plasma de-focusing. The research will enable development of a suitable modeling technique for laser-matter interaction that is associated with the use of ultrashort, high power lasers.Intellectual Merit. A multi-scale hybrid model will be developed to investigate the early plasma formation, its interaction with the laser beam and the target surface. For the formation of early plasma, a combined molecular dynamics and Monte Carlo model (MD/MC) will be developed to calculate the dynamics of neutrals, electrons, ions, photons and phonons, while considering the interactions among these particles. Since the temporal and spatial computation domain sizes of the combined MD/MC are limited because of computational complexity, the MD/MC will be interfaced with a finite difference model for the domain deep inside the target material, and also interfaced with the hydrodynamic equations for the domain above the target surface to model the plasma/ambient air region. This combined model will reveal detailed information about early plasma formation, and its interaction with the laser beam and the target surface. In the companion experimental study, the interferogram and shadowgraph techniques will be used to realize a more comprehensive measurement and observation of laser-generated plasma and shock waves at different delay times. The experimental results will be used for the validation of the model.Broader Impacts. High energy, ultrashort lasers have applications ranging from pulsed laser fabrication of thin films to laser micro/nano fabrication. Improving the understanding of high energy ultrashort, laser-material interaction can significantly expand the potential applications of these devices. The research will yield information relevant to the future development of suitable lasers for specific applications. The research results will be broadly disseminated at conferences targeted to both industrial and academic audiences, as well as at a dedicated web site. Several undergraduate students will be involved through the summer undergraduate research fellowship (SURF) program administered by the College of Engineering at Purdue, as well as through undergraduate independent projects. Involvement of underrepresented students will be pursued through existing programs such as Women in Engineering Program (WIEP) and the Minority Engineering Program (MEP). The research will be incorporated into an undergraduate manufacturing class, Principles and Practice of Manufacturing Processes. At the Illinois Institute of Technology (IIT), the new findings will be incorporated into a class entitled Advanced Manufacturing Engineering. Undergraduates and minority graduate students will be involved through the Undergraduate Research Fellowships program and a Special Topics class at IIT. Animation demonstration kits based on the project will be shared with the Chicago Public School Students Science Fair, to attract more students (particularly minority students) to become engaged in science and engineering.

0853528Wu该项目的目标是通过建模和实验加深对高能、超短激光-固体相互作用过程中等离子体和冲击波形成的理解和控制能力。特别是，将研究在高能超短激光束照射的固体表面附近出现的早期等离子体。目标是控制冲击波和等离子体特性，以便利用它们来产生新颖的结果，例如灯丝效应，即由自聚焦和等离子体散焦之间的动态平衡产生的等离子体颤振的形成。该研究将有助于开发一种适合激光与物质相互作用的建模技术，该技术与超短、高功率激光器的使用相关。智力价值。 将开发多尺度混合模型来研究早期等离子体的形成、其与激光束和目标表面的相互作用。 对于早期等离子体的形成，将开发组合分子动力学和蒙特卡罗模型（MD/MC）来计算中性子、电子、离子、光子和声子的动力学，同时考虑这些粒子之间的相互作用。 由于组合MD/MC的时间和空间计算域大小由于计算复杂性而受到限制，因此MD/MC将与目标材料深处域的有限差分模型接口，并且还与流体动力学方程接口目标表面上方的域来模拟等离子体/环境空气区域。该组合模型将揭示有关早期等离子体形成及其与激光束和目标表面相互作用的详细信息。在配套的实验研究中，将利用干涉图和阴影图技术来实现对不同延迟时间的激光等离子体和冲击波的更全面的测量和观察。实验结果将用于模型的验证。更广泛的影响。高能、超短激光器的应用范围从薄膜的脉冲激光制造到激光微/纳米制造。 提高对高能超短激光与材料相互作用的理解可以显着扩展这些设备的潜在应用。该研究将产生与未来开发适合特定应用的合适激光器相关的信息。研究结果将在针对工业界和学术界受众的会议以及专门的网站上广泛传播。一些本科生将参与普渡大学工程学院管理的夏季本科生研究奖学金（SURF）计划以及本科生独立项目。 将通过现有项目（例如女性工程项目（WIEP）和少数族裔工程项目（MEP））来吸引代表性不足的学生参与。该研究将被纳入本科生制造课程“制造工艺原理与实践”中。 在伊利诺伊理工学院 (IIT)，新发现将被纳入名为“先进制造工程”的课程中。本科生和少数族裔研究生将通过印度理工学院的本科生研究奖学金计划和专题课程参与其中。基于该项目的动画演示套件将与芝加哥公立学校学生科学博览会共享，以吸引更多学生（特别是少数族裔学生）从事科学和工程工作。