Yue Dan, Nie Haitao, Li Ye, Ying Changsheng
Appl Opt. 2018 Mar 1;57(7):1650-1656. doi: 10.1364/AO.57.001650.
Wavefront sensorless (WFSless) adaptive optics (AO) systems have been widely studied in recent years. To reach optimum results, such systems require an efficient correction method. This paper presents a fast wavefront correction approach for a WFSless AO system mainly based on the linear phase diversity (PD) technique. The fast closed-loop control algorithm is set up based on the linear relationship between the drive voltage of the deformable mirror (DM) and the far-field images of the system, which is obtained through the linear PD algorithm combined with the influence function of the DM. A large number of phase screens under different turbulence strengths are simulated to test the performance of the proposed method. The numerical simulation results show that the method has fast convergence rate and strong correction ability, a few correction times can achieve good correction results, and can effectively improve the imaging quality of the system while needing fewer measurements of CCD data.
近年来，无波前传感器（WFSless）自适应光学（AO）系统得到了广泛研究。为了达到最佳效果，此类系统需要一种有效的校正方法。本文提出了一种主要基于线性相位多样性（PD）技术的WFSless AO系统快速波前校正方法。基于可变形镜（DM）的驱动电压与系统远场图像之间的线性关系建立了快速闭环控制算法，该线性关系是通过线性PD算法结合DM的影响函数得到的。模拟了不同湍流强度下的大量相位屏来测试所提方法的性能。数值模拟结果表明，该方法收敛速度快、校正能力强，少数几次校正就能取得良好的校正效果，并且在需要较少CCD数据测量的情况下能有效提高系统的成像质量。
