Mitigating the relativistic laser beam filamentation via an elliptical beam profile

作     者：T. W. Huang C. T. Zhou A. P. L. Robinson B. Qiao H. Zhang S. Z. Wu H. B. Zhuo P. A. Norreys X. T. He 

作者机构：HEDPS Center for Applied Physics and Technology and School of Physics Peking University Beijing 100871 People's Republic of China Central Laser Facility STFC Rutherford-Appleton Laboratory Didcot OX11 0QX United Kingdom Institute of Applied Physics and Computational Mathematics Beijing 100094 People's Republic of China Science College National University of Defense Technology Changsha 410073 People's Republic of China Clarendon Laboratory Department of Physics University of Oxford Parks Road Oxford OX1 3PU United Kingdom 

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：2015年第92卷第5期

页      面：053106-053106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：National Natural Science Foundation of China [91230205, 11575031, 11575298, 11175026] National Basic Research Program of China (973 Program) [2013CBA01500, 2013CB834100] National High-Tech 863 Project Thousand Young Talents Program of China China Scholarship Council 

主　　题：Laser pulses Filamentation instability Gaussian beams Laser power transmission Simulation methods & models 

摘      要：It is shown that the filamentation instability of relativistically intense laser pulses in plasmas can be mitigated in the case where the laser beam has an elliptically distributed beam profile. A high-power elliptical Gaussian laser beam would break up into a regular filamentation pattern—in contrast to the randomly distributed filaments of a circularly distributed laser beam—and much more laser power would be concentrated in the central region. A highly elliptically distributed laser beam experiences anisotropic self-focusing and diffraction processes in the plasma channel ensuring that the unstable diffractive rings of the circular case cannot be produced. The azimuthal modulational instability is thereby suppressed. These findings are verified by three-dimensional particle-in-cell simulations.