激光拉丝形状对太赫兹能量空间分布影响的研究

Research on the influence of the shape of the laser plasma on terahertz energy spatial distribution

为了明确太赫兹能量空间分布的影响因素,研究了激光拉丝形状对太赫兹能量空间分布的影响。采用柱面透镜替代传统球面透镜聚焦激光的方法改变激光拉丝的形状,产生一个片状的激光拉丝体,并采集该片状激光拉丝产生的太赫兹能量空间分布。研究结果表明,激光拉丝形状的改变不仅会引起太赫兹能量空间分布的改变,而且还会引起泵浦光偏振方向改变时使太赫兹能量空间分布发生改变。

In order to understand and explain the influence factors of terahertz energy spatial distribution from the physical mechanism,the influence of the shape of the laser plasma on terahertz energy spatial distribution was studied.By using a cylindrical lens instead of a spherical lens to focus laser,a plasma sheet is produced,and the terahertz energy spatial distribution generated by the plasma sheet is collected.The results show that the shape of the plasma itself not only directly affects the spatial distribution of terahertz energy,but also affects the influence of pump laser’s polarization changing to the spatial distribution of terahertz energy.