论文标题
桌面非线性极端紫外线光谱
Table-top Nonlinear Extreme Ultraviolet Spectroscopy
论文作者
论文摘要
缺乏足够高的通量和相干性能的可用台式极端紫外线（XUV）源限制了非线性XUV和X射线光谱的可用性，可以免费使用电子激光器（FEL）。在这里，我们首次通过高谐波种子X射线激光器（HHG-SXRL）观察到SHG，在桌上XUV源上展示了第二次谐波生成（SHG）[1,2]。此外，该实验代表了XUV中的第一个SHG实验。第一原理电子结构计算用于确认SHG信号的表面特异性和共振增强。具有飞秒时间分辨率的桌面源上的XUV-SHG在多组分系统中研究了元素特异性动力学的巨大机会，在多组分系统中，表面，界面和体积不对称的不对称在较小规模的实验室中起着驱动作用，而不是Fels。
The lack of available table-top extreme ultraviolet (XUV) sources with high enough fluxes and coherence properties have limited the availability of nonlinear XUV and x-ray spectroscopies to free electron lasers (FEL). Here, we demonstrate second harmonic generation (SHG) on a table-top XUV source for the first time by observing SHG at the Ti M2,3-edge with a high harmonic seeded soft x-ray laser (HHG-SXRL) [1,2]. Further, this experiment represents the first SHG experiment in the XUV. First-principles electronic structure calculations are used to confirm the surface specificity and resonant enhancement of the SHG signal. The realization of XUV-SHG on a table-top source with femtosecond temporal resolution opens up tremendous opportunities for the study of element-specific dynamics in multi-component systems where surface, interfacial, and bulk-phase asymmetries play a driving role in smaller-scale labs as opposed to FELs.
