Enhancement of terahertz emission from aqueous NaCl solutions

Author:

Zhang Yong,Shen Tao,Wang Haoyang,Li Hong1,Wang Tianwu1ORCID,He Guangchao,Chang Chao,Li Lirong

Affiliation:

1. Chinese Academy of Sciences

Abstract

Exploration of terahertz sources with high electric fields and broad bandwidth is of great importance for terahertz application. In this work, the enhancement of terahertz emission from aqueous NaCl solutions induced by femtosecond laser pulses has been demonstrated by experiments. The power of the terahertz wave emission from the NaCl solution with a concentration of 30% is 1.86 times stronger than that from liquid water under equivalent excitation conditions. By means of a liquid circulation system with accurate pressure and temperature control, the influence of parameters such as solution concentration, liquid temperature, and medium size on the terahertz emission has been investigated. According to the experiment results, strong terahertz pulses are radiated from NaCl solutions with higher concentration, higher temperature, and smaller diameter. In addition, the physical mechanisms responsible for strong terahertz radiation have been analyzed by actual measurements and numerical simulations.

Funder

National Natural Science Foundation of China

Yunnan Fundamental Research Projects

Major Science and Technology Projects in Yunnan Province

Special Project for Research and Development in Key Areas of Guangdong Province

Science and Technology Planning Project of Guangdong Province

Publisher

Optica Publishing Group

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