基于多个分数阶次的复杂光场相位恢复算法

给出了一种基于多个分数阶次的复杂光场相位恢复迭代算法。首先利用输入面和两个较高分数阶输出面上的强度信息,恢复出输入面相位分布的轮廓,然后再利用输入面和两个较低分数阶输出面,进一步恢复出相位分布的细节。分别针对具有缓变相位、随机相位分布的光场,进行了二维相位分布的恢复,都得到了良好的恢复结果。最后在一维情形下分析了探测噪声和光路位置调整误差对算法稳定性的影响。

Complex Optical Field Retrieved from Intensity Distributions on Several Fractional Fourier Transform Planes

An iterative phase retrieval algorithm is put forward, which makes use of intensity distributions on the input plane and several fractional Fourier transform planes. The intensity distributions on the input plane and other two fractional Fourier transform planes with relatively high orders are utilized to retrieve the phase profile, then the phase detail is retrieved by using other two fractional Fourier transform planes with relatively low orders. Good retrieval performances are obtained for two-dimensional slowly varying phase distribution and random phase distribution. Finally, the influences of the measurement noise and the fractional order error to the stability of this algorithm are analyzed in one-dimensional case, respectively.