CDS&E: Nanoconfined Heating via Ultrahigh-repetition-rate Lasers for Enhanced Surface Processing

CDS

基本信息

批准号：
1953300
负责人：
Yan Wang
金额：
$ 35万
依托单位：
Board of Regents, NSHE, obo University of Nevada, Reno
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2020
资助国家：
美国
起止时间：
2020-07-01 至 2024-12-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1953300&HistoricalAwards=false
关键词：
CDS&amp Nanoconfined Heating via Ultrahigh

项目摘要

Pulsed laser processing is a manufacturing method that uses ultrafast laser pulses to precisely fabricate three-dimensional objects. Among the tunable parameters in pulsed laser processing, the laser repetition rate (the number of laser pulses per second) has only recently been recognized as essential for controlling the affected depth of laser ablation, sintering, and melting processes. This depth limit determines the resolution and efficiency of pulsed laser technologies for micro-/nano-electronics and aerospace and nuclear applications. This project aims to explore the minimum achievable depth when the laser repetition rate increases to the giga-/terahertz regime. A set of advanced computational tools will be developed and implemented to understand the laser and materials interactions under extreme conditions. Successful completion of this project will enable confined heating of ultrahigh-repetition-rate lasers to the nanoscale, thereby improving the precision and efficiency of ablation, melting, and sintering of nano-layers at material surfaces. The research team will also develop education programs on thermal transport and laser manufacturing at the extremes to impact and inspire broad audiences, from local K-12 students to students at the University of Nevada, Reno. Open-source code developed from the project will be deployed at nanoHUB.org and accessible to both academia and industry. The overarching goals of this project are to predict and control the depth of the heat-affected zone during ultrahigh-repetition-rate laser processing, to model the unique microstructure behaviors of laser-material interactions under extreme conditions, and to develop and apply advanced thermomechanical models to predict the material responses to laser processing. Specifically, the research team will develop, validate, and share advanced computational models for predicting thermal transport behaviors for a broad range of materials under pulsed laser heating at repetition rates up to the terahertz regime. Moreover, the PIs will develop thermomechanical models—synergizing the power of the phase field method, molecular dynamics, and Boltzmann transport equations—for predicting the poorly understood material behaviors and properties during and after ultrahigh-repetition-rate laser processing. The process-structure-property relations for ultrahigh-repetition-rate laser processing will be established through this project. Such knowledge will enable the development of ultra-precise, fast, and efficient laser manufacturing technologies via nano-confined heating. This project is jointly funded by the Thermal Transport Processes program and the Established Program to Stimulate Competitive Research (EPSCoR).This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

脉冲激光加工是一种利用超快激光脉冲精确制造三维物体的制造方法，在脉冲激光加工的可调参数中，激光重复率（每秒激光脉冲的数量）直到最近才被认为是必不可少的。控制激光烧蚀、烧结和熔化过程的深度，该深度限制决定了微/纳米电子、航空航天和核应用的脉冲激光技术的分辨率和效率。当激光重复率增加到千兆/太赫兹范围时，将开发和实施一套先进的计算工具来了解极端条件下激光和材料的相互作用，该项目的成功完成将实现超高的有限加热。 -重复率激光达到纳米级，从而提高材料表面纳米层的烧蚀、熔化和烧结的精度和效率。研究团队还将开发有关极端热传输和激光制造的教育项目。影响和激励广大受众，从当地 K-12 学生到内华达大学里诺分校的学生，该项目开发的开源代码将部署在 nanoHUB.org 上，供学术界和工业界使用。该项目旨在预测和控制超高重复率激光加工过程中热影响区的深度，模拟极端条件下激光与材料相互作用的独特微观结构行为，并开发和应用先进的热机械模型来预测材料具体来说，研究团队将开发、验证和共享先进的计算模型，用于预测重复率高达太赫兹范围的脉冲激光加热下各种材料的热传输行为。热机械模型——协同相场法、分子动力学和玻尔兹曼输运方程的力量——用于预测超高重复率激光加工期间和之后人们知之甚少的材料行为和特性。通过该项目将建立超高重复率激光加工的工艺-结构-性能关系，这些知识将有助于通过纳米高效加热开发超精密、快速的激光制造技术。热传输过程计划和刺激竞争研究既定计划 (EPSCoR)。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查进行评估，被认为值得支持标准。