中国激光, 2016, 43 (2): 0212001, 网络出版: 2016-01-25   

点目标下基于变形镜本征模式的无波前传感器自适应光学系统

Deformable Mirror Eigen-Modes Based Wavefront Sensorless Adaptive Optics System for Point-Like Target
作者单位
北京理工大学光电学院,北京 100081
摘要
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。
Abstract
For point-like target, a wavefront sensorless adaptive optics correction method using deformable mirror (DM) eigen- modes is proposed and studied by simulation and experiment. A set of DM eigen- modes whose derivatives are orthogonal with each other is derived from the influence function matrix of DM to replace traditional Lukosz modes. The metric function is set as the mean square radius of far-field spot. The required correction amount of each mode is directly solved from the relationship between coefficients of DM eigen-modes and the metric function value. In the simulation,the correction accuracy using the two modes mentioned above is compared and the effect of modal bias coefficient variation on correction accuracy is analyzed. Closed-loop correction results for different aberration level are also given. The experimental system is set up based on a 37- channel DM. Experimental results show that low- order aberrations can be effectively corrected by the algorithm and the correction accuracy of DM eigen-modes is better than Lukosz modes.

王瑞, 董冰. 点目标下基于变形镜本征模式的无波前传感器自适应光学系统[J]. 中国激光, 2016, 43(2): 0212001. Wang Rui, Dong Bing. Deformable Mirror Eigen-Modes Based Wavefront Sensorless Adaptive Optics System for Point-Like Target[J]. Chinese Journal of Lasers, 2016, 43(2): 0212001.

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