Distortion-Correction Method Based on Angular Spectrum Algorithm for Holographic Display

The reconstruction quality of computer-generated holographic display is subject to distortions, which are caused by manufacture defects and misalignments of optical elements. Distortion correction based on precision optics is costly and time-consuming. In this paper, a numerical distortion-correction method based on the angular spectrum algorithm is proposed. A wavefront acquisition system using a camera and the four-step phase-shifting algorithm is employed for calculating the distorted distributions. A wavefront correction system using the spatial light modulator is developed for eliminating distorted distributions. Effective distance, calculation time and iterations, and limitations of the method are discussed. The proposed method is robust in reducing distortions in computer-generated holographic display.