Flowing cryogenic liquid target for terahertz wave generation
Abstract
Terahertz wave emission from condensed matter excited by intense laser pulses not only reflects the details in laser-matter interaction but also offers bright terahertz wave sources. Flowing liquid targets possess the advantage of providing a fresh area for each laser pulse. To demonstrate a debris-free target under laser excitation, we investigate the use of liquid nitrogen as a target. By creating a flowing liquid nitrogen line in the ambient environment, we successfully observe broadband terahertz wave emission under short pulse excitation. Our cryogenic line is able to sustain the excitation of a high-repetition-rate (1 kHz) laser. The terahertz peak field emitted from liquid nitrogen is comparable to that from liquid water, yet a broader bandwidth is observed. This demonstration prompts new opportunities in choosing potential materials for studying terahertz wave generation process and in understanding laser-induced ionization in different liquids.
Cite
@article{arxiv.2007.13286,
title = {Flowing cryogenic liquid target for terahertz wave generation},
author = {Yiwen E and Yuqi Cao and Fang Ling and X. -C. Zhang},
journal= {arXiv preprint arXiv:2007.13286},
year = {2020}
}
Comments
16 pages, 4 figures