Linhai Huang, Rao Changhui
The Laboratory on Adaptive Optics, Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu, China.
Opt Express. 2011 Jan 3;19(1):371-9. doi: 10.1364/OE.19.000371.
Wavefront sensorless adaptive optics (AO) systems have been widely studied in recent years. To reach optimum results, such systems require an efficient correction method. In this paper, a general model-based correction method for a wavefront sensorless AO system is presented. The general model-based approach is set up based on a relationship wherein the second moments (SM) of the wavefront gradients are approximately proportionate to the FWHM of the far-field intensity distribution. The general model-based method is capable of taking various common sets of functions as predetermined bias functions and correcting the aberrations by using fewer photodetector measurements. Numerical simulations of AO corrections of various random aberrations are performed. The results show that the Strehl ratio is improved from 0.07 to about 0.90, with only N + 1 photodetector measurement for the AO correction system using N aberration modes as the predetermined bias functions.
近年来，无波前传感器自适应光学（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。本文提出了一种用于无波前传感器AO系统的基于通用模型的校正方法。基于通用模型的方法是基于一种关系建立的，其中波前梯度的二阶矩（SM）与远场强度分布的半高宽大致成比例。基于通用模型的方法能够将各种常见的函数集用作预定的偏置函数，并通过使用较少的光电探测器测量来校正像差。对各种随机像差的AO校正进行了数值模拟。结果表明，对于使用N个像差模式作为预定偏置函数的AO校正系统，仅需N + 1次光电探测器测量，斯特列尔比就从0.07提高到了约0.90。
