Abstract Wavefront sensorless (WFSless) adaptive optics (AO) systems have been widely studied in recent years. However, most of the existing WFSless AO systems require point sources for wavefront sensing. Aimed to correct the turbulence-degraded imaging of extended objects, this document proposes a fast wavefront correction approach for a WFSless AO system based on linear phase diversity (PD) technique. By linearizing the system optical transfer function (OTF) and expanding the influence functions of the deformable mirror (DM) on Zernike basis, this method can establish a linear relationship model between the drive voltages of the DM and the CCD acquired extended images. Then the control signal of the DM can be directly output to generate a compensated wavefront from CCD images and fast adaptive wavefront correction can be realized. Numerical simulations and an experimental validation are performed under different turbulence strengths, the results show that the proposed method has an impressive improvement of root mean square (RMS) of wavefront and can effectively restore the turbulence-degraded extended images with a relatively fast correction speed.

中文翻译：

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基于线性相位分集技术的扩展物体波前无传感器自适应光学系统

摘要 近年来，无波前传感器（WFSless）自适应光学（AO）系统得到了广泛的研究。然而，大多数现有的 WFSless AO 系统都需要点源进行波前传感。为了校正扩展物体的湍流退化成像，本文提出了一种基于线性相位分集 (PD) 技术的无 WFS AO 系统的快速波前校正方法。该方法通过对系统光学传递函数(OTF)进行线性化，并在Zernike基础上扩展可变形反射镜(DM)的影响函数，建立DM驱动电压与CCD获取的扩展图像之间的线性关系模型。然后直接输出DM的控制信号，从CCD图像中生成补偿波前，实现快速自适应波前校正。