Limits of the capacity and density of holographic storage

Abstract

Previous research assessing planar holographic storage and cross talk between volume multiplexed holograms is reviewed. Using these results, we derive equations for volume holographic storage density and capacity. These equations permit us to identify and to calculate the trade-off between storage density and input-output parallelism and the dependence of capacity on both the parallelism and the resolution of the input-output path.

Saturation of multiplexed volume Bragg grating recording

“…Optimum values of spatially averaged total exposure were found for each of those saturation curves and the corresponding Fourier amplitudes of individual gratings. For relatively large multiplicity, or number of gratings N ≳ 4, analytical formulae (14) through (15), derived by us, are in good correspondence with the results of numerical modeling. In particular, the best amplitude of individual Fourier components goes down as const∕N, and values of that const are determined for each normalized saturation curve ρU on exposure U.…”

“…Recording several volume holograms in the same volume has been studied theoretically and experimentally in [12][13][14] and numerous other works, with the purpose of data storage. Those studies were aimed to maximize the number of recorded holograms.…”

Ultimate Information Capacity of a Volume Photosensitive Media

“…When information is reading from a hologram, the orientation of the reconstructed beam is determined by the points of intersection of the Ewald sphere (the radius of which is equal to the readout light wave vector k 0 ) and the reciprocal lattice. The scattering vector coincides in this case with the vector of reciprocal lattice (5) or (6), as shown in Fig. 1.…”

“…Information capacity and throughput of different optical objects, including holograms, is of vital importance for optical information processing and storage systems [1][2][3][4][5] . Here we analyze the ultimate information capacity of a three-dimensional (volume) hologram for the case of an optimal use of the dynamic range of the storage medium.…”

Advanced ultra-high-capacity optical random access memory and pattern recognition techniques

“…Among the various techniques being developed, the 3-D volume holographic memory has been considered as one of the most important and promising for data storage. [3][4][5][6][7][8][9][10][11] For example, Mok 5 reported that more than thousands of holograms can be stored in a lithium niobate crystal via angular multiplexing, Heanue et al 4 demonstrated the storage and retrieval of digital data using a volume hologram, and Yu and Yin have used a volume photorefractive crystal to make a reflection type matched filter applicable for pattern recognition. 11 The purpose of this paper is to present a new and basic concept of a multichannel multistage spatially parallel holographic optical random access memory ͑HORAM͒ system and the theoretical analysis of a two-stage HORAM architecture.…”