Powerful laser-produced quasi-half-cycle THz pulses

作     者：A. S. Kuratov A. V. Brantov V. F. Kovalev V. Yu. Bychenkov 

作者机构：P. N. Lebedev Physics Institute Russian Academy of Science Leninskii Prospect 53 Moscow 119991 Russia Center for Fundamental and Applied Research Dukhov Research Institute of Automatics (VNIIA) Moscow 127055 Russia Keldysh Institute of Applied Mathematics Russian Academy of Sciences Moscow 125047 Russia 

出 版 物：《Physical Review E》 (物理学评论E辑：统计、非线性和软体物理学)

年 卷 期：2022年第106卷第3期

页      面：035201-035201页

核心收录：

学科分类：07[理学] 070203[理学-原子与分子物理] 0702[理学-物理学] 

基　　金：Ministry of Education and Science of the Russian Federation  Minobrnauka  (075-15-2021-1361) 

主　　题：Laser-plasma interactions Terahertz generation in plasmas 

摘      要：The Maxwell equations-based 3D-analytical solution for the terahertz (THz) half-cycle electromagnetic wave transition radiation pulse has been found. This solution describes generation and propagation of transition radiation into free space from laser-produced relativistic electron bunch which crosses a target-vacuum interface as a result of ultrashort laser pulse interaction with a thin high-conductivity target. The analytical solution found complements the theory of laser initiated transition radiation. It describes the THz wave half-cycle pulse at the arbitrary distance from a target surface including near-field zone rather than its standard far-field characterization. The analytical research has also been supplemented with the 3D simulations using the finite-difference time-domain method, which makes it possible for description of much wider spatial domain as compared to that from the particle-in-cell approach. The presented result sheds light fundamentally on the interference of the electron bunch field and the generated THz field of broadband transition radiation from laser-plasma interaction. The latter is studied for a long time in the experiments with solid density plasma and the theory developed may inspire to targeted measurements and investigations of unique super intense half-cycle THz radiation waves near the laser target.