自适应光学系统模式控制动态优化方法

像差校正模式项数是自适应光学系统模式控制算法中的一个重要参数,其大小对补偿效果影响明显。通过对系统响应函数矩阵的奇异值分解构建像差模式空间,以不同控制项数下残余像差的均方根估计为依据确定每次校正的模式项数,提出了一种模式项数动态优化的控制方法。以Hartmann-Shack波前传感器和薄膜变形镜为主要部件搭建自适应光学实验系统,通过拟合不同像差验证上述控制方法,实验结果表明,和固定项模式控制方法比较,动态优化方法校正的系统残余像差更低,可明显提高自适应光学系统的空间拟合性能。

Dynamic Optimization Method for Modal Control of Adaptive Optics System

The number of correction modes, an important parameter for the modal control of an adaptive optics system, has a significant effect on the system performance. The mode space of aberrations is built up by the singular value decomposition of the system′s response function matrix. The number of correction modes is determined by the root mean square estimation of the residual aberration obtained under different numbers of correction modes. A dynamic optimization method for modal control of adaptive optics system is proposed. An adaptive optical experimental system mainly based on a Hartmann-Shack wavefront sensor and a membrane deformable mirror is constructed. The above control method is verified by fitting different aberrations. Results show that the residual aberration with correction by the dynamic optimization method of modal control is smaller than the one with correction by the method of the fixed mode number, and the spatial fitting performance of the adaptive optics system can be obviously improved.