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: 2014
• 资助国家: 加拿大
• 起止时间: 2014-01-01 至 2015-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=548255
• 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，人们进行了大量的研究工作，以在以前未使用的频率范围内开发强大的相干辐射源，这对于科学研究和实际应用都非常有意义。其中两个频率范围是 XUV/X 和太赫兹频率。由于频率高，XUV/X 辐射在原子和分子光谱、等离子体表征和原子科学中具有重要应用，并有望在生命和材料科学的显微镜领域得到新的应用。在可见光谱的低频端，太赫兹辐射有望在远程化学和结构完整性分析以及安全领域发挥重要作用。 XUV/X 和太赫兹辐射之间的共同点是，两者都可以通过高强度飞秒激光脉冲和低密度介质（气体或等离子体）的相互作用产生。 XUV/X 和 THz 产生的当前主要挑战是提高源的产量，并且就 XUV/X 而言，将光谱尽可能扩展到高频（X 射线范围），以便获得足够的强度来实现预期的应用。该研究项目的总体目标是从理论上研究低密度介质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，以及（iii）通过数值模拟研究新的更复杂的实验安排，以增加感兴趣的频率范围内的产量。这些计算机工具将成为“建模工具箱”的关键组成部分，该工具箱可以在未来应用于与高强度激光脉冲和低密度介质之间相互作用相关的许多其他问题。