A new phase retrieval method is investigated to reconstruct wavefronts of optical parallel plates with the use of a group of diffraction patterns. More specifically, the improved phase retrieval algorithm is realized by converting the measuring plane wave into a spherical wave and by using single or double discrete Fourier transforms to calculate both far- and near-field diffraction propagations, and the accuracy is improved by adjusting the exposure time of the charge-coupled device according to the distance between the focal plane and diffraction plane. Both the theoretical and experimental results are consistent with the results obtained using conventional wavelength-modulated phase-shifting interferometry. The new method opens new doors for realizing wavefront measurement of optical parallel plates with high accuracy, especially for large-aperture parallel plates in inertial confinement fusion laser systems.

研究了一种使用一组衍射图案重建光学平行板波前的新相位检索方法。更具体地说，改进的相位反演算法是通过将测量平面波转换为球面波，并使用单或双离散傅立叶变换计算远场和近场衍射传播来实现的，并通过调整曝光来提高精度电荷耦合器件的时间取决于焦平面和衍射平面之间的距离。理论和实验结果都与使用传统波长调制相移干涉测量法获得的结果一致。新方法为实现高精度光学平行板波前测量打开了新的大门，