Fast calculation method of hologram based on diffraction optimization

Holographic 3D display is considered as one of the ideal 3D displays. However, due to the large amount of data of 3Dobjects, the calculation speed of holograms is still relatively slow. In this paper, a fast hologram calculation method is proposed based on diffraction optimization. The information of 3D object is divided into the high-frequency part and the low-frequency part. The new look-up table (NLUT) algorithm is used to calculate the details of the high-frequency part, thus reducing the amount of diffraction calculation and ensuring the calculation accuracy of the details, while the low frequency information is diffracted by the faster angular spectrum algorithm. The sub-hologram of high-frequency information and the sub-hologram of low-frequency information are superimposed to obtain the final hologram. When the collimated light is used to illuminate the final hologram, the 3D reconstructed image of the object can be seen. Compared with the traditional NLUT algorithm, the calculation speed of the proposed method is increased by ~57.8%. Experiments verify the feasibility of the proposed method.