Eur. Phys. J. D (2022) 76: 85
https://doi.org/10.1140/epjd/s10053-022-00404-8

Regular Article - Ultraintense and Ultrashort Laser Fields

Optimization of high-order harmonic generation for the time-resolved ARPES

¹ Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, 100190, Beijing, People’s Republic of China
² School of Physics and Optoelectronic Engineering, Xidian University, 710071, Xi’an, People’s Republic of China
³ University of Chinese Academy of Science, 10049, Beijing, People’s Republic of China
⁴ Songshan Lake Materials Laboratory, 523808, Dongguan, Guangdong, People’s Republic of China

^b xinkuihe@iphy.ac.cn
^f zywei@iphy.ac.cn

Received: 7 February 2022
Accepted: 18 April 2022
Published online: 16 May 2022

Abstract

We experimentally investigated the optimized phase matching condition for high order harmonic generation as a source of time-resolved Angle-resolved photoemission spectroscopy (TR-ARPES) applications. In the loose focusing scheme, we find that the divergence of harmonics decreases with the increase of gas cell length, while the maximum intensity is obtained with 10–15 mm gas cell. Our result shows that stable beam condition with best temporal resolution can be realized for TR-ARPES by using a longer gas cell (longer than 25 mm in our experiment), and an appropriate gas cell length can provide balanced condition for good beam intensity and good temporal resolution.