Charge–carrier diffusion length in photorefractive crystals computed from the initial hologram phase shift

Novel method for converting digital Fresnel hologram to phase-only hologram based on bidirectional error diffusion.

We report a novel and fast method for converting a digital, complex Fresnel hologram into a phase-only hologram. Briefly, the pixels in the complex hologram are scanned sequentially in a row by row manner. The odd and even rows are scanned from opposite directions, constituting to a bidirectional error diffusion process. The magnitude of each visited pixel is forced to be a constant value, whil...

Nonvolatile storage in photorefractive crystals.

Holographic storage in photorefractive crystals'` 3 has a high storage density owing to three-dimensional storage and a high readout rate owing to parallel retrieval. The practical development of such memories has been impeded by a lack of materials that have all the suitable properties. Specifically, the most difficult requirement to satisfy is the simultaneous need for materials that are maxi...

Solitonic lattices in photorefractive crystals.

Two-dimensional spatial solitonic lattices are generated and investigated experimentally and numerically in a Sr(x)Ba(1-x)Nb(2)O(6):Ce crystal. An enhanced stability of these lattices is achieved by exploiting the anisotropy of coherent soliton interaction, in particular the relative phase between soliton rows. The manipulation of individual soliton channels is achieved by the use of supplement...

Measurement of the photorefractive grating phase shift in a polymer by an ac phase-modulation technique

Multi-component vector solitons in photorefractive crystals

We study the existence and stability of multi-component spatial optical solitons in anisotropic nonlocal photorefractive media. For the case of three components, we find numerically the whole family of composite solitons with two perpendicular dipole components, and show their stability for a wide range of parameters. We confirm our theoretical results by an experimental observation of these no...