基于相位恢复的无调制四棱锥波前传感器  

Non-Modulation Pyramid Wavefront Sensor Based on Phase Retrieval

作　　者：王中旗 陆彦婷 Wang Zhongqi;Lu Yanting(Nanjing Institute of Astronomical Optics&Technology,National Astronomical Observatories,Chinese Academy of Sciences,Nanjing 210042,Jiangsu,China;Key Laboratory of Astronomical Optics&Technology(Nanjing Institute of Astronomical Optics&Technology),Chinese Academy of Sciences,Nanjing 210042,Jiangsu,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院国家天文台南京天文光学技术研究所,江苏南京210042 [2]中国科学院天文光学技术重点实验室(南京天文光学技术研究所),江苏南京210042 [3]中国科学院大学,北京100049

出　　处：《光学学报》2023年第4期208-218,共11页Acta Optica Sinica

基　　金：国家自然科学基金面上项目(11873069)。

摘　　要：四棱锥波前传感器具有能量利用率高和空间采样率高的优点,已成功应用于天文自适应光学、镜面检测及显微成像等领域。提出一种新的无调制四棱锥波前传感器,根据四棱锥波前传感器的光场传播模型,利用相位恢复算法迭代优化出待测波前。入射光经四棱锥锥尖分光后会聚所得的子光瞳像为相位恢复算法提供了丰富的信息,使其收敛速度加快。数值模拟结果表明,基于相位恢复的四棱锥波前传感器具有精度高、收敛速度快、抗噪性好等特点,并且无需调制便能获得较大的动态范围。Objective The pyramid wavefront sensor(PWFS)has been successfully applied to astronomical adaptive optics,mirror testing,and microscopy imaging due to its advantages of high energy utilization and spatial resolution.Modulation is often performed to expand the linear and dynamic ranges of the PWFS.Classical modulation methods include mechanical modulation,static modulation,and dynamic aberration modulation.Mechanical modulation involves the oscillation of the pyramid itself or a tip-tilt mirror at the entrance pupil of the system;static modulation adds a diffuser into the system;dynamic aberration modulation uses rapidly changing and undetectable aberrations as the signals to be modulated.However,the above methods all sacrifice the sensitivity of the PWFS for wider dynamic and linear ranges,which reduces the practicality of the PWFS.This paper proposes a novel non-modulation PWFS to expand the application of the PWFS in the field of phase detection.The proposed PWFS iteratively optimizes the wavefront to be measured with a phase retrieval algorithm based on a light-field propagation model of the PWFS.This PWFS based on phase retrieval has the features of high accuracy,fast convergence speed,and favorable noise immunity.Moreover,the proposed sensor covers a large dynamic range with no need for modulation.Methods A PWFS with a 4f configuration is adopted,and a phase retrieval algorithm based on a light-field propagation model of the PWFS is designed to reconstruct the wavefront to be measured.Due to the beam-splitting effect of the pyramid tip,four sub-images of the pupil are recorded by the detector of the PWFS.The whole image from the detector is used as one constraint on the phase retrieval algorithm,while the assumed uniform intensity on the pupil plane serves as the other constraint.Owing to the abundant information provided by this detector image,the phase retrieval algorithm in the proposed sensor usually converges quickly.A series of simulation experiments are performed to evaluate the performance of the pro

关 键 词：传感器 波前传感 四棱锥波前传感器 相位恢复 自适应光学 

分 类 号：O436[机械工程—光学工程]