A speckle noise suppression method in phase-only holographic display based on an improved Gerchberg–Saxton algorithm

In this paper, a speckle noise suppression method in phase-only holographic display based on an improved Gerchberg–Saxton(GS) algorithm is proposed. The computer generated hologram(CGH) is calculated by employing triple-constraint Gerchberg–Saxton(TCGS) algorithm. The amplitude distribution and the phase distribution in the signal domain are simultaneously constrained as the desired distribution to suppress speckle noise, meanwhile, the phase distribution in the non-signal domain is also constrained to increase the uniformity of the reconstructed object. In addition, the setting of signal domain ratio has a great influence on the quality of the final reconstructed object. It is found that when the signal domain ratio accounts for 25%− 65%, the quality of the reconstruction is much better. Furthermore, by putting forward some restrictions on sample intervals, the multi-plane three-dimensional(3D) object calculated by TCGS algorithm will defocus without fragmentation and fracture phenomenon. Both simulation and experiment results show that the speckle contrast is lower than 0.05, which verifies the effectiveness of the algorithm.