一种可对复杂光场进行相位恢复的算法

给出了一种改进的相位恢复迭代算法。根据多个面的强度信息进行相位恢复,并提出将相位恢复过程划分为轮廓恢复和细节恢复两个阶段。首先利用三个较远的衍射面及输入面的强度信息,恢复出输入面相位分布的轮廓,然后再利用两个较近的衍射面及输入面,进一步恢复出相位分布的细节。该方法在一维情况下能够准确地恢复出各种输入光场,尤其是复杂光场的相位分布,大幅度提高了相位恢复的精度。模拟实验还表明,本算法具有较好的鲁棒性:多次随机选取迭代初始值时,收敛结果唯一;并具有良好的抗噪性能。

A Phase Retrieval Algorithm for Complex Optical Field

An improved iterative phase retrieval algorithm is put forward,which makes use of intensity information in several planes,and divides the retrieval process into two steps: profile retrieval and detail retrieval.First the input plane and other three far diffraction planes are needed to retrieve the profile of phase distribution,then the phase detail is available in a similar way.The phase distribution of any one dimensional optical field,including very complicated ones,can be successfully retrieved with this algorithm,and the accuracy of retrieval is greatly enhanced.This algorithm is also very robust.It has convergence independent on the initial phase,and high stability towards additive noise,which are both confirmed by simulations.