模型式无波前探测自适应光学系统收敛速度优化

Optimization of the convergence speed for model-based wavefront-sensorless adaptive optics system

基函数及其阶数的选择对模型式无波前探测自适应光学(AO-Adaptive Optics)系统的收敛速度和校正效果具有重要的意义。当变形镜(DM-Deformable Mirror)的本征模作为系统的基函数时,系统的收敛速度取决于本征模的阶数。考虑到实际应用中,低阶像差占整个像差的大部分,为加快模型式无波前探测AO系统的收敛速度,使用本征模的部分低阶模式作为系统的基函数,分析系统的收敛速度和校正能力。结果表明:当校正效果达到全阶模式校正效果的80%时,不论湍流强弱,系统收敛速度都有一定程度的提高。相同的波前像差下,变形镜单元数越多,系统收敛速度的优化空间越大。

The choices of basis function and its order are of great significance to the convergence speed and correction effect of the model-type AO-Adaptive Optics system.When the eigenmode of the DM-Deformable Mirror is used as the basis function of the system,the convergence speed of the system depends on its order.Considering that low-order aberrations account for most of the entire aberrations in practical applications,in order to accelerate the convergence speed of the model-type wave-front detection AO system,this article uses some low-order modes of the eigenmode as the basis functions to analyze the convergence speed and the correction capabilities of the system.The results show that when the correction effect reaches 80%of full-order mode correction effect,the convergence speed of the system is improved to a certain extent regardless of the turbulence intensity.Under the same wave-front aberration,the more the number of anamorphic mirror units,the greater the optimization space for system convergence speed.