A high-repetition rate attosecond light source for time-resolved coincidence spectroscopy

Nanophotonics

article

Sara Mikaelsson¹  Saikat Nandi¹  Wenjie Jin²  Anna Olofsson¹  Robin Weissenbilder¹  Johan Mauritsson¹  Anne L’Huillier¹  Mathieu Gisselbrecht¹  Cord L. Arnold¹  Jan Vogelsang¹  Chen Guo¹  Ivan Sytcevich¹  Anne-Lise Viotti¹  Fabian Langer¹  Yu-Chen Cheng¹ 

[1] Department of Physics, Lund University;ASML Veldhoven

关键词: attosecond science;    electron momentum spectroscopy;    high-order harmonic generation;    ultrafast photonics;   

DOI  :  10.1515/nanoph-2020-0424

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

Attosecond pulses, produced through high-order harmonic generation in gases, have been successfully used for observing ultrafast, subfemtosecond electron dynamics in atoms, molecules and solid state systems. Today’s typical attosecond sources, however, are often impaired by their low repetition rate and the resulting insufficient statistics, especially when the number of detectable events per shot is limited. This is the case for experiments, where several reaction products must be detected in coincidence, and for surface science applications where space charge effects compromise spectral and spatial resolution. In this work, we present an attosecond light source operating at 200 kHz, which opens up the exploration of phenomena previously inaccessible to attosecond interferometric and spectroscopic techniques. Key to our approach is the combination of a high-repetition rate, few-cycle laser source, a specially designed gas target for efficient high harmonic generation, a passively and actively stabilized pump-probe interferometer and an advanced 3D photoelectron/ion momentum detector. While most experiments in the field of attosecond science so far have been performed with either single attosecond pulses or long trains of pulses, we explore the hitherto mostly overlooked intermediate regime with short trains consisting of only a few attosecond pulses. We also present the first coincidence measurement of single-photon double-ionization of helium with full angular resolution, using an attosecond source. This opens up for future studies of the dynamic evolution of strongly correlated electrons.

【 授权许可】

CC BY