相关哈特曼-夏克波前传感器波前重构新方法

对相关哈特曼-夏克波前传感器的波前重构方法进行了研究,提出了一种基于相邻子图像间相对平移量的波前重构新方法。与常用的基于单一参考子图像的波前重构方法相比,新方法的动态范围有了很大提高。在8×8去4角的子孔径划分下,测量离焦波面时,新方法的动态范围可提高约16倍,子孔径数目越多,动态范围提高的倍数也越高。精度分析表明,两种波前重构方法在8×8去4角的子孔径划分下精度相近,在子孔径数目更多时,相邻子图像处理法的波前重构精度低于单一参考子图像法。

A new wavefront reconstruction method for correlating Hartmann-Shack wavefront sensor

The wavefront reconstruction methods for correlating Hartmann-Shack wavefront sensor are studied. A new wavefront reconstruction method based on relative shifts between neighboring subimages is presented. Compared with the usual method based on single reference subimage,the new method has a lot larger measuring range. Under 8×8 subapertures with the 4 corner parts removed,the measuring range is enlarged by 16 times when measuring the defocused wavefront. The more subapertures used,the larger number of times by which the measuring range is enlarged. Precision analysis shows that,under 8×8 subapertures with the 4 corner parts removed,the two reconstruction methods have a similar precision. With larger number of subapertures,the precision of the method based on processing of the neighboring subimages is lower than the one using single reference subimage.