利用波长为 1.06 μm、单脉冲能量约为 500 mJ的脉冲 Nd:YAG激光经焦距为 300 mm的正透镜聚焦, 使焦点处激光能量密度剧增而引起大气分子中的原子电离, 在发生同波长激光散射和多光谱电磁辐射现象的同时, 开展空间分辨光谱的探测, 获得 1.06 μm脉冲激光经大气等离子体散射的空间分布情况。采用 HR4000光谱仪对散射情况进行测量分析, 通过计算机模拟计算得到等离子体对 1.06 μm激光散射的方向图, 基于 Mie理论解释了入射波长为 1.06 μm脉冲激光散射角与散射强度之间的关系。

The pulse Nd:YAG laser whose wavelength is 1.06 μm and the single pulse energy is about 500 mJ is focused by a lens with 300 mm focal length. So the laser energy density leaps at the focus and it leads to atom ionization phenomena. At the phenomenon of laser scattering with the same wavelength and multi-spectral electromagnetic radiation, the distributions of spacial spectrums are detected. And the spacial distribution states of pulse laser with 1.06 μm scattered by plasma in the atmosphere are obtained. The scattering states are measured and analyzed by HR4000 spectrometer. According to the simulation calculation of a computer, the directional pictures of the laser with 1.06 μm wavelength from plasmas scattering are obtained. Based on Mie theory, the relationship between the scattering angle and scattering intensity of the pulse laser with 1.06 μm incident wavelength is explained.