Accession Number : ADP006723

Title :   Photorefractive Crystal Waveguides and their Applications,

Corporate Author : NIPPON TELEGRAPH AND TELEPHONE CORP TAKE TRANSMISSION SYSTEMS LABS

Personal Author(s) : Kitayama, Ken-ichi ; Ito, Fumihiko

Report Date : 22 MAY 1992

Pagination or Media Count : 4

Abstract : Photorefractive crystal waveguide(PCW) is a novel approach to enhance the Photorefractive effects. The waveguide geometry Provides a tight optical field confinement and long interaction length of waves, resulting in increasing diffraction efficiency and angular sensitivity of hologram. It also allows to synthesize a high-density matrix array. Key issues to gain the practical applicability are how to overcome the drawbacks of PCW such as the finite aperture and modal phase dispersion which affects both image fidelity and holographic storage capacity. In this paper, the solutions to the above problems of PCW are presented. Both neural image processings by storing holographic synaptic matrix in 2-D PCW array and distortion-free image replication by phase conjugation in PCW are investigated. LiNbO3 and barium titanates waveguides are used in the experiments.

Descriptors :   *CRYSTALS, *REFRACTION, APERTURES, APPROACH, ARRAYS, DENSITY, DIFFRACTION, DISPERSIONS, DISTORTION, EFFICIENCY, GAIN, GEOMETRY, HIGH DENSITY, HOLOGRAMS, IMAGES, INTERACTIONS, LENGTH, PHASE, SENSITIVITY, STORAGE, WAVEGUIDES, IMAGE PROCESSING, NEURAL NETS, LITHIUM NIOBATES, SYMPOSIA.

Subject Categories : Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE