利用激光与等离子体相互作用产生超强太赫兹辐射的研究成为国内外研究的热点。基于Smith提出的线形天线辐射理论,对超强超短激光脉冲驱动天线靶产生太赫兹的辐射特性进行研究,建立了完备的辐射空间分布和频谱空间分布表达式。利用激光脉冲长度与天线长度的比值对辐射场分布的影响,讨论了固定天线长度时的最佳激光脉冲长度,以及固定激光条件时,天线长度对辐射场的频谱和空间分布的调制作用。理论分析结果表明,激光脉冲长度决定了辐射频率范围,激光脉冲长度与天线长度的比值决定了辐射场峰值的方向和频谱分布,为设计合理实验方案提供理论依据。 The research on generating super-terahertz radiation by the interaction between laser and plasma has become a hot research field at home and abroad. Based on the linear antenna radiation theory proposed by Smith, the radiation characteristics of terahertz radiation generated by the super-short pulse laser driven antenna are studied, and a complete radiation spatial distribution and spectrum spatial distribution expression are established. The influence of the ratio of laser pulse length to antenna length on the radiation field distribution is discussed. The optimal laser pulse length when the antenna length is fixed and the modulation effect of the antenna length on the spectral and spatial distribution of the radiation field under fixed laser condition are discussed. Theoretical analysis shows that the length of the laser pulse determines the radiation frequency range. The ratio of the length of the laser pulse to the length of the antenna determines the direction and spectral distribution of the peak of the radiation field, which provides a theoretical basis for designing a reasonable experimental scheme.