Single-cycle strong terahertz pulse generation from a vacuum-plasma interface driven by intense laser pulses

被引:26
作者
Dong, X. G. [1 ]
Sheng, Z. M. [1 ,2 ]
Wu, H. C. [3 ]
Wang, W. M. [1 ]
Zhang, J. [1 ,2 ]
机构
[1] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China
[2] Shanghai Jiao Tong Univ, Dept Phys, Shanghai 200240, Peoples R China
[3] Max Planck Inst Quantum Opt, D-85748 Garching, Germany
来源
PHYSICAL REVIEW E | 2009年 / 79卷 / 04期
基金
中国国家自然科学基金;
关键词
numerical analysis; plasma light propagation; plasma nonlinear processes; plasma simulation; RADIATION;
D O I
10.1103/PhysRevE.79.046411
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
Single-cycle strong terahertz pulses can be generated by irradiating ultrashort intense laser pulses onto a tenuous plasma slab. At the plasma surface, laser ponderomotive force accelerates electrons and induces net currents, which radiate terahertz pulses. Our theoretical model suggests that if tau(L)>2 pi/omega(p), with tau(L) as the laser-pulse duration and omega(p) as the plasma frequency, the emission frequency is around tau(-1)(L). On the other hand, the emission frequency is around omega(p)/2 pi if tau(L)< 2 pi/omega(p). Our numerical simulations support the theoretical model, showing that such a terahertz source is capable of providing megawatt power, field strengths of MV/cm, and broad frequency tunability.
引用
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页数:6
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