高能激光大气传输的仿真实验研究
Simulation experiment of high energy laser propagation in the atmosphere
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摘要: 对高能激光在大气中传输时产生的热晕效应及其相位补偿进行了室内仿真实验测量，获得了自适应光学系统开闭环时用来衡量光束传输效果参量（如远场的光斑图像、质心漂移、二阶矩半径、及Strehl比等）。结果表明，Bradley-Hermann热畸变参数在300范围内，自适应光学系统相位补偿效果显著，Strehl比基本大于0.4。然而随着热畸变效应的进一步加强，出现相位补偿不稳定性现象，补偿效果变差。另外，对自适应光学系统开闭环时的实验结果分别与薄透镜近似分析理论及几何光学近似理论作了比较。比较结果表明:薄透镜近似理论与未补偿时的实验结果吻合较好，而几何光学近似理论与补偿后的实验结果存在较大的偏差。Abstract: Simulation experiments of adaptive optics compensation to thermal blooming phase distortion induced by high energy laser propagation in the atmosphere were carried out. The results of spot pattern, centroid excursion, second moment radius and the Strehl ratio in the focal plane were obtained when the adaptive optics system was in the open or closed loop shape. The effect of adaptive optics compensation was prominent when the Bradley-Hermann distortion number was less than 300, and the Strehl ratio was more than 0.4 on the whole. Phase compensation instability appeared when the distortion number ND became greater than 300, in this case, the compensated beam Strehl ratio went down rapidly. The experimental Strehl ratio without adaptive optics compensation agreeed well with that of the thin l
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