| dc.description.abstract | In traditional holographic storage systems, we can utilize the thickness of the photosensitive material layer in holographic plates to achieve multiplex recording of information from different angles within the same area. However, current holographic storage multiplexing techniques suffer from a decrease in diffraction efficiency as the number of multiplexed holograms increases. The diffraction efficiency tends to decrease by the square of the multiplexing factor, which negatively impacts readout speed and capacity.
To address this issue, we propose the ＂ N Times Enhancement of Diffraction Efficiency of Volume Holographic Multiplexing Technology,＂ which improves the problem of diffraction efficiency decreasing by the square of the multiplexing factor. However, experiments have shown uneven distribution of information in the readout images.
In this paper, we introduce the recording of information in reciprocal space and subsequently transform the information through a lens using Fourier transformation. This process improves the uniformity of the readout signal and increases the number of recorded information pages. In this holographic storage system, multiple sets of information are multiplexed and recorded in the same recording area. The readout signal is obtained by the interference of individually retrieved signals from each reading beam. By introducing a shift in the holographic plate, the readout position corresponds to a change in the wavefront of the reading beam, resulting in a phase change in the recorded information. Therefore, we design the phase of the superimposed signals to produce constructive and destructive interference during the shift readout process, allowing for variations in signal intensity corresponding to different shift distances. Additionally, utilizing the information in reciprocal space enables higher uniformity in the readout information. | en_US |