Dynamics of Clusters Controlled by Intense Laser Pulses

强激光脉冲控制的团簇动力学

• 批准号: 0317352
• 负责人: Howard Milchberg
• 金额: $ 47.62万
• 依托单位: University of Maryland, College Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-08-15 至 2006-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0317352&HistoricalAwards=false
• 关键词: Dynamics; Clusters; Controlled; Intense; Laser

The interaction of intense laser pulses with atomic clusters requires consideration of physics spanning the range from laser-solid to laser-gas interaction. Individual clusters are atomic aggregates up to ~1000 A in diameter formed through van der Waals bonding of atoms/molecules in a gas jet expansion. Intra-cluster density is that of a solid, while a gas of clusters formed through nozzle expansion is much less. The laser pulse therefore interacts locally with nanoscale solids (the individual clusters), yet sees the bulk medium as a gas through which it can propagate. Thus, the physics of ultrashort laser-cluster interaction has completely new features not realized either in traditional laser-solid target experiments or in laser-gas experiments. This project will explore further, and as yet untested, implications of a laser-cluster interaction model developed by the group. Specific attention will be paid to the investigation of strong compressions of intense laser-heated clusters. In a second, more applied, set of experiments, work will continue on the study of extreme ultraviolet and x-ray emission from intense laser cryogenic noble-gas droplet interactions. This work has direct implications for extreme ultraviolet (EUV) source development for next-generation lithography.

强烈激光脉冲与原子簇的相互作用需要考虑从激光固醇到激光气体相互作用的物理学。单个簇是通过气射流膨胀中原子/分子的范德华键形成的直径〜1000 a的原子聚集体。集群内密度是固体的，而通过喷嘴膨胀形成的簇的气体却少得多。 因此，激光脉冲与纳米级固体（单个簇）局部相互作用，但将大量培养基视为可以传播的气体。因此，超时激光群集相互作用的物理学具有在传统的激光固定靶实验或激光气体实验中未实现的全新特征。 该项目将进一步探索，但尚未经过测试，是该组开发的激光群集交互模型的含义。 将特别注意对强烈激光加热簇的强大压缩。在第二秒，应用的一组实验中，将继续研究极端紫外线和X射线发射，从强烈的激光低温贵族液滴相互作用进行研究。这项工作对下一代光刻的极端紫外线（EUV）源开发具有直接影响。