Optimization of high-order harmonic generation for the time-resolved ARPES Yueying Liang, Xinkui He, Liqiang Liu, Junli Wang, Shuai Wang and Zhiyi Wei Eur. Phys. J. D, 76 5 (2022) 85 Published online: 16 May 2022 DOI: 10.1140/epjd/s10053-022-00404-8