基于Ronchi光栅Talbot效应的相位恢复

Phase Retrieval Based on Talbot Effect of Ronchi Grating

提出了一种基于Ronchi光栅Talbot效应的相位恢复方法。将CCD相机置于Ronchi光栅的Talbot距离处,记录Ronchi光栅的自成像强度分布。通过随机并行梯度下降(SPGD)算法优化Zernike多项式系数,恢复入射相位。数值模拟实验结果表明,所提出的方法能够快速实现高精度的相位恢复,具有收敛速度快、精度高、抗噪声等优点。

One phase retrieval method based on the Talbot effect of Ronchi grating is proposed.A CCD camera is placed at the Talbot distance of Ronchi grating to record the self-image intensity distribution of Ronchi grating.By using the stochastic parallel gradient descent（SPGD）algorithm,the coefficients of Zernike polynomials are optimized to retrieve the input phase.The numerical simulation results show that,the proposed method can quickly achieve a high-precision phase retrieval and possesses the advantages of fast convergence,high precision,and antinoise and so on.