Japan Long-Term Research Visit: Picosecond Time-Resolved Spectroscopy of Laser Plumes

日本长期考察访问：激光羽流皮秒时间分辨光谱

• 批准号: 9201118
• 负责人: M Q Brewster
• 金额: $ 8.98万
• 依托单位: University of Illinois at Urbana-Champaign
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-08-01 至 1994-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9201118&HistoricalAwards=false
• 关键词: Japan; Long; Term; Research; Visit

This award will support a long-term visit of nine months by Professor M. Quinn Brewster, Department of Mechanical and Industrial Engineering, University of Illinois at Urbana- Champaign, to Japan for a cooperative research project with Professor Yukio Yamada at the Mechanical Engineering Laboratory (MEL), Agency for Industrial Science and Technology, Ministry of International Trade and Industry. The research will include a study of the picosecond time-resolved spectroscopy of laser plumes. A major problem associated with laser material processing is achieving efficient coupling of laser energy into the workplace. This coupling is governed by complicated, non- linear mechanisms at the target and above the target surface in a plume/plasma/shock wave generated by laser-material interaction. Various studies have shown sharp decreases in the transmissivity and/or thermal coupling coefficients associated with plume formation. Characteristics of the plume are largely unknown, but are known to depend upon incident laser flux level. This research addresses the difficult problem of shedding more light on the structure of, and heat transfer mechanisms in, the plume formed above Al targets when irradiated by high power lasers. This research supports a companion NSF-sponsored study which has as a primary objective the development of techniques which can be used to determine the relative importance of plume absorption, scattering, and emission on coupling of laser energy into metal targets. Results of the research have the potential of optimizing and expanding the use of lasers in materials processing. The facilities at MEL are state-of-the-art and include high power processing lasers, rapid scan spectrometers, and picosecond, pulsed dye lasers and photo-oscilloscopes. This type of equipment is found in only a few laboratories in the world. The combination of modern experimental facilities and experience in application of picosecond time-resolved spectroscopy on the part of the Japanese host researcher and experience in high-power laser-material interaction on the part of the U.S. principal investigator offers a unique opportunity to expand the knowledge- base of a technology which is of critical importance to U.S. industrial competitiveness.

该奖项将支持为期九个月的长期访问， M教授Quinn布鲁斯特，机械和 伊利诺伊大学厄巴纳分校工业工程系 尚潘，日本的合作研究项目， Yukio Yamada教授在机械工程实验室 (MEL)日本经济产业省产业技术厅 国际贸易和工业。 该研究将包括一个 激光皮秒时间分辨光谱的研究 羽毛 与激光材料相关的一个主要问题 加工是实现激光能量有效地耦合到 职场 这种耦合是由复杂的，非- 在目标处和目标表面上方的线性机构， 由激光-材料相互作用产生的羽流/等离子体/冲击波。 各种研究表明， 和/或与羽流相关的热耦合系数 阵 羽流的特征在很大程度上是未知的，但 已知依赖于入射激光通量水平。 这 研究解决了如何让更多的光 对羽流的结构和热传递机制的研究 在高功率激光照射下，在Al靶上形成了一层致密的铝膜。 这项研究支持了NSF赞助的一项同伴研究， 作为一个主要目标，开发技术， 用于确定烟羽吸收的相对重要性， 激光能量耦合到金属中时的散射和发射 目标的 研究结果具有优化和 扩大激光在材料加工中的应用。 的 MEL的设施是最先进的，包括高功率 加工激光器，快速扫描光谱仪，和皮秒， 脉冲染料激光器和照相示波器。 这种类型的 世界上只有少数几个实验室有这种设备。 的 结合现代化的实验设施和经验， 皮秒时间分辨光谱在零件上的应用 日本主机的研究人员和经验，在高功率 激光与材料的相互作用 调查员提供了一个独特的机会，以扩大知识- 一项对美国至关重要的技术基础。 产业竞争力。