Excellence in Research: Seeding Stimulated Raman Backscattering with Intense and Ultra-Intense Laser Pulses

卓越的研究：用强和超强激光脉冲播种受激拉曼反向散射

• 批准号: 1901397
• 负责人: Jun Ren
• 金额: $ 94.64万
• 依托单位: Delaware State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-07-15 至 2024-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1901397&HistoricalAwards=false
• 关键词: Excellence; Research; Seeding; Stimulated; Raman

Achieving high peak intensity and extreme power of laser pulses stands on the leading edge of laser developments. The continued scaling of lasers to increase power will soon reach the limits dictated by the damage threshold of solid state materials; plasmas can provide an alternative laser gain medium, potentially allowing laser power to reach extraordinary levels. This project provides a simulation-driven discovery and experimental verification platform to achieve the next level of high laser intensity using plasma as the amplification medium. This represents a new advance in decade-long research efforts to understand the rich physics behind laser-plasma processes and the production of high-power, ultra-short laser pulses. This project will contribute to increasing the research capacity of Delaware State University (DSU) in STEM and will help to build the core infrastructure in research at the interface of ultrafast science and plasma physics at DSU. The multi-disciplinary nature of the project, involving laser physics and engineering, plasma physics, and computational physics, will bring unique education and training opportunities to graduate and undergraduate students from under-served communities. The collaborations within DSU and other institutions will also offer the students a chance to work with world-class scientists.The goal of this project is to develop a solid theoretical understanding and to simulate and test the robustness of a Stimulated Raman Back Scattering (SRBS) scheme in plasma, through which a coherent, ultrashort, ultra-intense laser pulse is generated in a plasma channel. This SRBS scheme aims to overcome the saturation barrier faced in previous efforts, which limits the conversion efficiency and the maximum amplified seed energy. Using simulations as the guide, the full capacity of the scheme and the physical mechanisms in the scheme will be revealed and explored. Experimentally, the scheme will be investigated in detail using intense and ultra-intense input seed pulses. The amplification and compression of the ultra-intense pulse provides exciting and new phenomena in ultrafast and plasma science research. The generated ultrashort, ultra-intense SRBS pulse will open up new and unique opportunities for generating atto-second pulses, and water-window x-ray lasers. The work will be carried out through integrated group efforts of theory, computation, and experiment relying on joint expertise from Delaware State University and partners at Princeton University and Lawrence Livermore National Laboratory. This project is managed by the Division of Physics and jointly funded by the Historically Black Colleges and Universities Excellence in Research 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.

实现激光脉冲的高峰强度和极端功率是激光发展的前沿。激光器的持续缩放以增加功率将很快达到由固态材料的损伤阈值所决定的极限;等离子体可以提供替代的激光增益介质，可能使激光功率达到非凡的水平。该项目提供了一个模拟驱动的发现和实验验证平台，以实现使用等离子体作为放大介质的下一个级别的高激光强度。这代表了长达十年的研究工作的新进展，以了解激光等离子体过程和高功率超短激光脉冲产生背后的丰富物理学。该项目将有助于提高特拉华州州立大学（DSU）在STEM方面的研究能力，并将有助于建立DSU超快科学和等离子体物理学接口研究的核心基础设施。该项目的多学科性质，涉及激光物理和工程，等离子体物理和计算物理，将为来自服务不足社区的研究生和本科生带来独特的教育和培训机会。 DSU和其他机构的合作也将为学生提供与世界一流科学家合作的机会。该项目的目标是建立坚实的理论理解，并模拟和测试等离子体中受激拉曼背散射（SRBS）方案的鲁棒性，通过该方案，在等离子体通道中产生相干，超短，超强激光脉冲。该SRBS方案旨在克服以前的努力中所面临的饱和势垒，该饱和势垒限制了转换效率和最大放大种子能量。以模拟为指导，该计划的全部能力和计划中的物理机制将被揭示和探索。实验上，该计划将详细研究使用强烈和超强烈的输入种子脉冲。超强脉冲的放大和压缩为超快和等离子体科学研究提供了令人兴奋的新现象。所产生的超短、超强SRBS脉冲将为产生阿秒脉冲和水窗X射线激光器开辟新的独特机会。这项工作将通过理论、计算和实验的综合小组努力进行，依靠特拉华州州立大学和普林斯顿大学和劳伦斯利弗莫尔国家实验室的合作伙伴的联合专业知识。 该项目由物理学部管理，并由历史上黑人学院和大学卓越研究计划和刺激竞争性研究的既定计划（EPSCoR）共同资助。该奖项反映了NSF的法定使命，并被认为值得通过使用基金会的智力价值和更广泛的影响审查标准进行评估来支持。

项目成果

Resonant Energy Transfer, with Creation of Hyper-Excited Atoms, and Molecular Auto-Ionization in a Cold Rydberg Gas

共振能量转移，产生超激发原子，以及冷里德堡气体中的分子自电离

• DOI: 10.4236/jmp.2021.129074
• 发表时间: 2021
• 期刊: Journal of Modern Physics
• 作者: Rasamny, Marwan;Martinez, Alan;Xin, Lianxin;Ren, Jun;Zerrad, Essaid
• 通讯作者: Zerrad, Essaid