Circularly polarized sources of radiation play a vital role in photoelectron circular dichroism and magnetic circular dichroism experiments. While circularly polarized radiation can be routinely generated in the visible domain of the electromagnetic spectrum due to the availability of laser sources and optics in this range, generation of circularly polarized radiation in the extreme ultraviolet (XUV) domain is challenging and, using table-top sources it is currently limited to high harmonic generation from gases using bi-circular, complicated two-source and/or interferometry arrangement. In this work, being fueled by recent development of high harmonic generation and spectroscopy of solids, we demonstrate the generation of circularly polarized extreme ultraviolet light using interaction of intense circularly polarized drivers. The simplicity of our experimental setup enables rapid application of circularly polarized XUV light in circular dichroism experiments.

圆偏振辐射源在光电子圆二色性和磁圆二色性实验中起着至关重要的作用。虽然由于此范围内的激光源和光学器件的可用性，可以在电磁光谱的可见域中常规产生圆偏振辐射，但在极紫外 (XUV) 域中产生圆偏振辐射具有挑战性，并且使用桌面源，目前仅限于使用双圆形、复杂的双源和/或干涉测量装置从气体中产生高次谐波。在这项工作中，受到高次谐波产生和固体光谱学的最新发展的推动，我们展示了使用强圆偏振驱动器的相互作用产生圆偏振极紫外光。