Theoretical analysis and simulations of strong terahertz radiation from the interaction of ultrashort laser pulses with gases.
Theoretical analysis and simulations of strong terahertz radiation from the interaction of ultrashort laser pulses with gases.
复制标题
DOI：
10.1103/physreve.78.046406
复制
发表时间：
2008-10
期刊：
影响因子：
--
通讯作者：
Min Chen;A. Pukhov;Xiao-yu Peng;O. Willi
中科院分区：
文献类型：
--
作者：
Min Chen;A. Pukhov;Xiao-yu Peng;O. Willi
通过理论分析和粒子池模拟研究了超短激光脉冲与气体相互作用产生的太赫兹（THz）辐射。给出了基于瞬态电离电流机制的一维太赫兹产生模型，解释了一维PIC仿真的结果。同时给出了最终太赫兹场与初始瞬态电离电流的关系。一维和二维模拟表明，对于太赫兹的产生，由于电离的电流的贡献远远大于由通常的重力动势驱动的电流。对不同激光脉冲和气体产生的电离电流进行了数值研究。基于数值结果，我们解释了谢等人最近进行的实验中观测到的太赫兹辐射的标度规律。Rev. Lett. 96, 075005(2006)]。我们还研究了利用太赫兹产生载波包络相位测量的有效参数区域。
Terahertz (THz) radiation from the interaction of ultrashort laser pulses with gases is studied both by theoretical analysis and particle-in-cell (PIC) simulations. A one-dimensional THz generation model based on the transient ionization electric current mechanism is given, which explains the results of one-dimensional PIC simulations. At the same time the relation between the final THz field and the initial transient ionization current is shown. One- and two-dimensional simulations show that for the THz generation the contribution of the electric current due to ionization is much larger than the one driven by the usual ponderomotive force. Ionization current generated by different laser pulses and gases is also studied numerically. Based on the numerical results we explain the scaling laws for THz emission observed in the recent experiments performed by Xie et al. [Phys. Rev. Lett. 96, 075005 (2006)]. We also study the effective parameter region for the carrier envelop phase measurement by the use of THz generation.