Hybrid approach used for extended image-based wavefront sensor-less adaptive optics

作     者：董冰 喻际 

作者机构：School of OptoelectronicsBeijing Institute of Technology 

出 版 物：《Chinese Optics Letters》 (中国光学快报（英文版）)

年 卷 期：2015年第13卷第4期

页      面：21-25页

核心收录：

学科分类：080202[工学-机械电子工程] 08[工学] 0802[工学-机械工程] 

基　　金：supported by the Specialized Research Fund for the Doctoral Program of Higher Education(Grant No.20131101120023) the Excellent Young Scholars Research Fund of the Beijing Institute of Technology(Grant No.2012YG0203) 

主　　题：DM Hybrid approach used for extended image-based wavefront sensor-less adaptive optics mode 

摘      要：The stochastic paralld gradient descent （SPGD） algorithm is widely used in wavefront sensor-less adaptive optics （WSAO） systems. However, the convergence is relatively slow. Modal-based algorithms usually provide much faster convergence than SPGD; however, the limited actuator stroke of the deformable mirror （DM） often prohibits the sensing of higher-order modes or renders a closed-loop correction inapplicable. Based on a comparative analysis of SPGD and the DM-modal-based algorithm, a hybrid approach involving both algorithms is proposed for extended image-based WSAO, and is demonstrated in this experiment. The hybrid approach can achieve similar correction results to pure SPGD, but with a dramatically decreased iteration number.