The storage of volume phase holograms yields extremely large recording densities. The physical processes involved and the most important storage properties (sensitivity, density, storage time and hologram stabilization) are discussed for various electrooptic crystals.
R. A. Rupp,
"Holographic Storage Properties Of Electrooptic Crystals", Proc. SPIE 0673, Holography Applications, (15 January 1988); doi: 10.1117/12.939109; https://doi.org/10.1117/12.939109