EFFICIENT HIGH HARMONIC GENERATION SOURCES FOR APPLICATIONS IN X-RAY IMAGING

高次谐波产生（HHG）已经从实验本身发展成为新实验技术的光源。在时域中，这是有据可查的，但是用于利用HHG的空间相干性以及其其他属性的应用的HHG源的开发要少得多。本论文的工作旨在开发有效的空间相干的XUV和软X射线辐射源，用于相干成像等实验，这在很大程度上依赖于HHG的相干特性。将通过研究波长依赖性和相位匹配来探索生成效率，重点是同时的高空间相干性。一系列样品的高分辨率X射线显微镜的发展，这需要高通量和高相干性，将被用作一个测试案例，以完善HHG源的属性。

High Harmonic Generation (HHG) has moved from being an experiment in itself to acting as a light source for new experimental techniques. In the time domain this is well documented, but HHG sources for applications which make use of the spatial coherence of the HHG as well as its other properties are much less well developed. The work in this thesis aims to develop efficient and spatially coherent sources of XUV and soft X-ray radiation for use in experiments such as coherent imaging, which rely heavily on the coherence properties of the HHG. the efficiency of generation will be explored via study of wavelength dependence and phase matching, with the emphasis on concurrent high spatial coherence. The development of high-resolution X-ray microscopy of a range of samples, which requires both high flux and high coherence, will be used as a test case to refine the HHG source properties.