Robust multibook recording with signal beam phase optimization based on Gerchberg–Saxton algorithm for holographic data storage

Owing to the rapid growth of digital information, demand for archival storage with high data transfer rate, large capacity, longevity, low power consumption, and low running cost has surged. Although holographic data storage (HDS) is considered as a promising candidate for next-generation archival storage due to its potential in these areas, it has not been released commercially due to difficulties in stable recording and reproduction across the whole recording area or multibook area. In this study, we proposed a robust multibook recording technique based on signal beam phase optimization using the Gerchberg–Saxton (GS) algorithm. We optimized the target distribution of the signal beam amplitude at the Fourier plane for the GS algorithm, considering the hologram recording and reproduction characteristics, such as DC suppression, inter-book-interference (IBI) reduction, and the signal-to-noise ratio (SNR). Optical simulation of multibook recording and reproduction shows that IBI can be properly reduced, and sufficient SNR can be retained even if 13.6% book misalignments occur during recording. In addition, combining the proposed technique with an accurate book alignment method could increase the HDS capacity by 33.9%.