Numerical modeling of frequency conversion of high-intensity laser pulses into XUV/X and THz radiation

高强度激光脉冲频率转换为 XUV/X 和 THz 辐射的数值模拟

• 批准号: 298184-2011
• 负责人: Vidal, François
• 金额: $ 1.6万
• 依托单位: Institut national de la recherche scientifique
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=571446
• 关键词: Numerical; modeling; frequency; conversion; intensity

In recent years there has been an intense research effort to develop powerful and coherent radiation sources in previously unused frequency ranges of great interest both for scientific research and practical applications. Two of these frequency ranges are the XUV/X and THz frequencies. Due to its high frequency, XUV/X radiation finds its important applications in atomic and molecular spectroscopy, characterization of plasmas, and in attoscience, and promises new applications in the context of microscopy applied to life and materials sciences. At the low-frequency end of the visible spectrum, the THz radiation promises important applications in the areas of remote chemical and structural integrity analysis, and in security. A common point between XUV/X and THz radiation is that both can be generated from the interaction of a high-intensity femtosecond laser pulse and a low density medium - gas or plasma. The main current challenge in both XUV/X and THz generation is to increase the yield of the sources and, in the case of XUV/X, extend the spectrum as far as possible towards high frequencies (X-ray range), in order to obtain sufficient intensities to achieve the envisaged applications. The general goal of this research program is to investigate theoretically the frequency conversion process of high intensity laser pulses in low density media, with emphasis on the generation of XUV/X and THz radiation. The modeling tools that will be developed within this research program will allow to: (i) improve our general understanding of the physical processes, (ii) optimize the experimental setups, and (iii) investigate through numerical simulations new more sophisticated experimental arrangements to increase the yield in the frequency ranges of interest. These computer tools will be key components of a "modeling toolbox" that can be applied in the future to many other problems related to the interaction between high-intensity laser pulses and low-density media.

近年来，在以前未使用的频率范围内开发出强大而连贯的辐射源，既可以为科学研究和实用应用而产生极大的兴趣。其中两个频率范围是XUV/X和THZ频率。由于其高频率，XUV/X辐射在原子和分子光谱，等离子体的表征以及Attoscience中找到了重要的应用，并承诺在适用于生命和材料科学的显微镜的背景下新应用。在可见光谱的低频端，THZ辐射有望在远程化学和结构完整性分析和安全性领域中的重要应用。 XUV/X和THZ辐射之间的一个共同点是，两者都可以通过高强度飞秒激光脉冲的相互作用和低密度介质 - 气体或等离子体产生。 XUV/X和THZ生成的主要挑战是增加源的产量，在XUV/X的情况下，将光谱尽可能地扩展到高频（X射线范围），以获得足够的强度以实现所设想的应用。该研究计划的一般目标是从理论上研究低密度培养基中高强度激光脉冲的频率转换过程，重点是XUV/X和THZ辐射的产生。该研究计划中将开发的建模工具将允许：（i）提高我们对物理过程的一般理解，（ii）优化实验设置，（iii）通过数值模拟进行调查，新的更复杂的实验布置以提高利益频率范围的产量。这些计算机工具将是“建模工具箱”的关键组件，将来可以应用于与高强度激光脉冲和低密度介质之间相互作用有关的许多其他问题。