Model-based wavefront sensorless adaptive optics system for large aberrations and extended objects.
Model-based wavefront sensorless adaptive optics system for large aberrations and extended objects.
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DOI：
10.1364/oe.23.024587
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发表时间：
2015-09
期刊：
影响因子：
3.8
通讯作者：
Huizhen Yang;O. Soloviev;M. Verhaegen
中科院分区：
文献类型：
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作者：
Huizhen Yang;O. Soloviev;M. Verhaegen
对具有 61 元件变形镜的基于模型的波前无传感器 (WFSless) 自适应光学 (AO) 系统进行了仿真，以校正湍流退化的扩展物体的成像。基于像差梯度均方与图像强度分布二阶矩之间的线性关系的快速闭环控制算法用于生成可变形镜（DM）执行器的控制信号。研究了不同湍流强度波前像差下AO系统的恢复能力和收敛速度。仿真结果表明，基于模型的 WFSless AO 系统可以成功地恢复因不同湍流强度而退化的图像，并获得非常接近给定 DM 的可实现能力的校正。与61元DM的理想校正相比，RMS值的平均相对误差为6%。 AO系统的收敛速度与湍流强度无关，仅取决于DM执行器的数量。
A model-based wavefront sensorless (WFSless) adaptive optics (AO) system with a 61-element deformable mirror is simulated to correct the imaging of a turbulence-degraded extended object. A fast closed-loop control algorithm, which is based on the linear relation between the mean square of the aberration gradients and the second moment of the image intensity distribution, is used to generate the control signals for the actuators of the deformable mirror (DM). The restoration capability and the convergence rate of the AO system are investigated with different turbulence strength wave-front aberrations. Simulation results show the model-based WFSless AO system can restore those images degraded by different turbulence strengths successfully and obtain the correction very close to the achievable capability of the given DM. Compared with the ideal correction of 61-element DM, the averaged relative error of RMS value is 6%. The convergence rate of AO system is independent of the turbulence strength and only depends on the number of actuators of DM.