A Communicative Computer Generated Hologram for Security in Communication System Using Fraunhofer Algorithm

In this work, we developed a Computer-Generated Hologram (CGH) based on Fraunhofer algorithm using Matlab for making a relatively secured communication system. In the Fraunhofer algorithm, the computation of far-field amplitude is carried out through Fourier transform which is required to calculate the interference pattern of digital holograms. Here the communicative holograms are developed by means of adding the far-field amplitude of main object image and reference object image. The reconstruction of the main object image is also accomplished the use of this algorithm. We detect the image overlapping constraints in the output image and additionally find the technique to avoid the overlapping between the main object image and inverted main object image at the receiver side. According to the properties of the hologram, the decoding of transmitted hologram is nearly impossible except reference information, so the proposed communicative holographic machine can be applied in the area of secure communication.