摘要
无波前传感器自适应光学的波前校正方法包括无模型优化算法和基于模式的优化算法。通过搭建实验光路验证了基于变形镜本征模式校正方法的有效性。实验结果表明,基于变形镜本征模式的校正方法和传统基于Lukosz模式的校正方法相比,避免了模式拟合误差,具有更高的校正精度。对各阶变形镜模式系数的校正量的估计是相互独立的,根据初始像差空间频率组成的不同,可以选择合适的模式校正阶数以提高校正速度。与目前常用的随机并行梯度下降(SPGD)算法相比,模式法的校正精度与之相当,但校正速度可以提高一个数量级。
The wavefront correction methods in wavefront sensorless adaptive optics can be classified into two groups: model-free optimization algorithms and modal-based optimization algorithms. In this paper, the feasibility of optimization algorithm based on deformable mirror(DM) eigen modes is verified by the experiments.Experimental results show that the correction accuracy of algorithm using DM eigen modes is higher than that of using Lukosz modes because the mode fitting error can be avoided. Since the correction amount of each DM eigen mode can be estimated independently, a proper mode number is chosen according to the spatial frequency contents in initial wavefront aberration to improve the correction speed. Compared with the commonly used stochastic parallel gradient descent(SPGD) algorithm, the correction accuracy of modal-based algorithm is nearly the same as it, but the correction speed is improved by one order of magnitude.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2015年第3期286-293,共8页
Acta Optica Sinica
基金
教育部高等学校博士学科点专项科研基金(20131101120023)
北京理工大学优秀青年教师资助计划跨学科合作项目(2012YG0203)
北京理工大学基础研究基金(20120442005
20120442011)
光电成像技术与系统教育部重点实验室基金(2014OEIOF03)
关键词
自适应光学
模式法
变形镜本征模式
Lukosz模式
随机并行梯度下降
adaptive optics
modal-based approach
deformable mirror eigen modes
Lukosz modes
stochastic parallel gradient descent