Terahertz radiation from a laser plasma filament

被引：50
作者：
Wu, H. -C. [1 ]
Meyer-ter-Vehn, J. [1 ]
Ruhl, H. [2 ]
Sheng, Z. -M. [3 ,4 ]
机构：
[1] Max Planck Inst Quantum Opt, D-85748 Garching, Germany
[2] Univ Munich, Dept Phys, D-80333 Munich, Germany
[3] Shanghai Jiao Tong Univ, Dept Phys, Inst Plasma Studies, Shanghai 200240, Peoples R China
[4] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China
来源：
PHYSICAL REVIEW E | 2011年 / 83卷 / 03期
关键词：
EMISSION; PULSE; FIELD; WAKE;
D O I：
10.1103/PhysRevE.83.036407
中图分类号：
O35 [流体力学]; O53 [等离子体物理学];
学科分类号：
070204 ; 080103 ; 080704 ;
摘要：
By the use of two-dimensional particle-in-cell simulations, we clarify the terahertz (THz) radiation mechanism from a plasma filament formed by an intense femtosecond laser pulse. The nonuniform plasma density of the filament leads to a net radiating current for THz radiation. This current is mainly located within the pulse and the first cycle of the wakefield. As the laser pulse propagates, a single-cycle and radially polarized THz pulse is constructively built up forward. The single-cycle shape is mainly due to radiation damping effect.
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页数：4
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