Multi-plane phase retrieval is a well established technique for reconstructing both, amplitude and phase of an object wave. This standard technique works best, if the intensity of the object wave changes rapidly along the optical axis. For slowly varying intensities, the iterative procedure may not converge at all. To overcome this limitation we combined the standard technique with a periodic phase element. We demonstrate that a binary diffractive micro lens array with overlapping aperture significantly improves the convergence of phase retrieval and thus the quality of reconstruction. Thus multi-plane phase retrieval can be applied for both rough and smooth phase distributions.

多平面相位检索是一种成熟的技术，可以同时重建物波的振幅和相位。如果物波的强度沿光轴快速变化，则此标准技术效果最佳。对于缓慢变化的强度，迭代过程可能根本不会收敛。为了克服这一限制，我们将标准技术与周期性相位元素相结合。我们证明具有重叠孔径的二元衍射微透镜阵列显着提高了相位检索的收敛性，从而改善了重建质量。因此，多平面相位检索可以应用于粗糙和平滑的相位分布。