研究了大气热晕效应自适应光学(adaptive-optics, AO)位相补偿数值模拟方法。利用自主开发的高能激光大气 传输四维数值模拟程序对准直光束瞬态热晕位相补偿进行了模拟,定量分析了不同的热晕强度下, 变形镜驱动器布局 对位相补偿效果的影响。数值模拟结果表明,变形镜驱动器的布局对AO系统闭环控制的稳定性影响较大,不同 的布局使得驱动器控制信号的方差存在较大差异,选择合适的驱动器布局可以改善AO系统闭环控制的 稳定性,提高位相补偿不稳定性发生的阈值。

The numerical simulation method of thermal blooming adaptive optics (AO) phase compensation is studied. Collimated beam instantaneous thermal blooming phase compensation is simulated by using the laser atmospheric propagation four-dimension (4-D) code which is independently developed. The effect of deformable mirror (DM) actuators layout on the phase compensation efficiency under different thermal blooming strength is numerically analyzed. The results show that the layout of DM actuators has great effect on the AO system close-loop control stability. When the layout of DM actuators is different, the variance of DM actuators commands is also different. The proper layout of DM actuator can improve the AO system close-loop control stability, increase the threshold value of phase compensation instability (PCI).