本文从实验上,用窄频带和宽频带激光,在无预脉冲和有预脉冲两种情况下,辐照平面Al靶.在垂直入射激光方向观察到高光谱分辨(～0.2?)和空间分辨(～2μm)的二次谐波空间分辨谱.通过分析各种现象,基本上证明了在垂直入射激光方向的二次谐波辐射是由激光与等离子体细丝相互作用所引起的,而不是由平面波与等离子体相互作用引起的,理论和实验基本一致.

Space resolved spectra with both high spectral resolution (-0.2A) and spatial resolution (-2μm) of the second harmonic emission scattered at 90°to the laser axis were observed when both narrow band and broad band laser beams were adopted in an Al planar target experiment. After analyzing many phenomena, it has been proved that the second harmonic emission observed at 90° to the laser axis is initiated by the interaction of laser with plasma filaments other than that of planar wave with plasmas. And theory is in agreement with experiment on the whole.