论文部分内容阅读
针对点目标提出了基于变形镜(DM)本征模式的无波前传感器自适应光学校正方法并进行了仿真和实验研究。由DM的影响函数矩阵推导出一组符合导数正交关系的DM本征模式代替传统的Lukosz模式。基于远场光斑的均方半径建立评价函数,利用DM本征模式系数与评价函数之间的关系求解出各阶模式所需的校正量。通过仿真比较了上述两种模式的校正精度,分析了模式偏置系数对校正精度的影响,给出了算法对不同大小像差的闭环校正结果。基于37单元DM搭建了实验系统,实验结果表明算法可以有效校正低阶像差,且采用DM本征模式的校正精度优于Lukosz模式。
Aiming at the point target, an adaptive optical correction method based on the deformable mirror (DM) eigenmode is proposed and simulated and experimentally studied. A set of DM eigenmodes that conform to the orthogonal relationship of the derivatives is deduced from the DM matrix of influence functions to replace the traditional Lukosz model. Based on the mean square radius of the far-field spot, an evaluation function is established. By using the relationship between the eigen-mode coefficient of DM and the evaluation function, the correction amount required for each mode is obtained. The simulation accuracy of the above two modes is compared. The influence of the mode offset coefficient on the calibration accuracy is analyzed. The closed-loop calibration results of the algorithm for different size aberrations are given. The experimental system based on 37-unit DM is constructed. The experimental results show that the proposed algorithm can effectively correct low order aberrations, and the correction accuracy of using DM eigenmode is better than that of Lukosz mode.