<title>Volume storage in photorefractive disks</title>

Abstract

We describe a photorefractive 3-D optical disk for data storage. The information is stored at several recording locations on the disk as angle-multiplexed holograms. Design parameters that affect alignment sensitivity and diffraction efficiency are considered.

Associative memory in a volume holographic medium: a new approach based on operator theory

“…To spatially modulate the refractive index of the crystal in three-dimensions, a hologram should be produced inside the volume of the crystal using appropriate wavelengths. Such holograms are usually produced by interfering a reference beam and a signal beam of light which is modulated by a phase-only spatial light modulator to precisely control the three-dimensional distribution of light inside the medium and locally change the refractive index of crystal as a function of light intensity at any point within the volume [8][9][10].…”