Affiliation:
1. Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences
2. University of Chinese Academy of Sciences
Abstract
High-order harmonics can generate vortex beams with orbital angular momentum (OAM) in the extreme ultraviolet region. However, experimental research on their phase-matching (PM) characteristics is limited. In this study, vortex high-order harmonic generation (HHG) in the extreme ultraviolet region was generated with Ar gas. Phase-matched HHG with OAM was obtained by optimizing the focus position, laser energy, and gas pressure. The dependence of the PM characteristics on these parameters was analyzed. In addition, we conducted an experimental analysis of the dimensional properties of vortex harmonics under PM conditions. This study is a contribution towards the intense vortex high-order harmonic light sources and their applications.
Funder
National Natural Science Foundation of China
Strategic Priority Research Program of the Chinese Academy of Sciences
Subject
Atomic and Molecular Physics, and Optics