Abstract
The basic physical mechanisms of hologram formation, as well as the major specific features of Bragg diffraction from anisotropic volume phase holograms recorded in cubic photorefractive crystals, are discussed. Special consideration is given to a new dynamic effect of hologram enhancement on recording an interference pattern running with a certain ‘resonance’ speed, the phenomenon underlying a new efficient mechanism of hologram recording, or the ‘long drift length‘ (LDL) mechanism. It is shown that weak light beams can be enhanced and an amplified complex conjugate light wave can be generated in cubic photorefractive crystals in the stationary regime. The maximum amplification is achieved for the shifted LDL hologram in four-wave mixing experiments with positive feedback when two oppositely travelling pump beams polarized orthogonally and at ± 45° to the plane of incidence result in the buildup of the hologram. The main phenomena discussed are illustrated by experimental results obtained in studies of c...
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