Crosstalk noise from multiple thick-phase holograms

Abstract

The crosstalk noise between holograms arising from multiple storage of holograms in the same volume is determined. The noise is measured to be oscillatory with a period greater than that predicted by the theory and to be intermediate in magnitude between the noise levels calculated assuming coherent and incoherent addition of the scattered amplitude from the off‐Bragg holograms. It was found that crosstalk noise can be reduced to a level compatible with high‐quality (S/N ratio ∼40 dB) readout images at angular spacings (0.1° in air) such that large numbers of holograms can be stored in a given volume.