不同角度激光打靶下的光谱结构研究

Investigation on spectral structures of plasmas produced by laser irradiation on planar target with different incidence angles

通过分析不同角度激光打靶条件下等离子体的辐射特性,发现在相同激光辐照功率密度下,激光垂直辐照等离子体产生铝的LPX强度要比激光斜入射辐照时明显增强,其中类氢离子跃迁线强度增长最为明显。实验结果还表明,激光斜入射辐照时LPX源沿靶面法线方向的尺寸变大,谐线变宽。

By means of analysing emission characteristics of plasmas produced by laser irradiation on Al planar target with different incidence angles, we find that: with the same laser irradiance intensity, the intensity of LPX (laser produced X-ray), which is produced by laser irradiation on Al planar target normally, is much stronger than that produced by laser irradiation on Al planar target obliquely;and the increase of the intensities of the H-like transition lines are much more obvious. In addition, the experimental results also show that the size of LPX source along the normal of the target surface, which is produced by laser irradiation on Al planar target obliquely, is much larger, and the widths of the spectral lines wider.