Dependence of CGH Reconstruction due to the Transfer Phase Function of Angular Spectrum Method

Abstract

Computer-generated hologram (CGH) is the method of making holograms with computer. A CGH can be made without preparing and instructing the exclusive optical tool. Therefore, we can make holograms easily and economically compared to the optical method. There are several calculating methods for a CGH such as Fourier transform, Fresnel diffraction and etc. In this study, we discuss on the angular spectrum method which is not limited by the diffraction distance. The Kirchhoff integral has the advantage of making reconstructions similar to optical experiment. However, the angular spectrum method has the disadvantage of accruing an error without proper conditions. These conditions are related to the transfer phase function. Moreover, the transfer phase function is related to the sampling interval and the number of sampling points. Therefore, it is necessary to investigate the relationship about these conditions and reconstruction errors. This study reports on the reconstruction using the angular spectrum method under different conditions about the transfer phase function. Simulation results will be shown on the relationship under these conditions.