An efficient low-density grating setup for monochromatization of XUV ultrafast light sources

• DOI: 10.48550/arxiv.2210.07445
• Publication Date: 2022-01-01
• Authors: Qinda Guo; Maciej Dendzik; Magnus H. Berntsen; Antonija Grubišić...; Cong Li; Wanyu Chen; Yang Wang; O. Tjernberg
• Keywords: Monochromator; Extreme ultraviolet; Harmonic

Ultrafast light sources have become an indispensable tool to access and understand transient phenomenon in material science. However, a simple easy-to-implement method for harmonic selection, with high transmission efficiency pulse duration conservation, is still challenge. Here we showcase compare two approaches selecting the desired from generation source while achieving above goals. The first approach combination of extreme ultraviolet spherical mirrors filters second uses normal-incidence grating. Both solutions target time- angle-resolved photoemission spectroscopy photon energies 10-20 eV range but are relevant other experimental techniques as well. selection characterized terms focusing quality, efficiency, temporal broadening. It demonstrated that grating able provide much higher compared mirror+filter (3.3 times 10.8 12.9 18.1 eV), only slight broadening (6.8% increase) somewhat larger spot size (~30% increase). Overall, our study establishes perspective on trade-off between single normal incidence monochromator design use filters. As such, it provides basis most appropriate various fields where needed.