Image processing is achieved through the phase conjugate nature of the storage and retrieval process of the photorefractive material
, which allows you to recover the exact image even if noise is imparted to the signal before it is stored.
In a photorefractive material
, these carriers diffuse in all directions.
In some cases these photorefractive materials
have been used to make holographic gratings.
Huignard, Photorefractive Materials
and Their Applications 2: Materials, vol.
Secondly, the underlying physics of SNN medium is different from linear optics, such as the nonlocality in laser-induced thermal nonlinearities is thermal diffusion, and the nonlocal response in photorefractive materials
is induced by the photogeneration of carriers.
CGHs may be recorded with various materials, such as photorefractive materials
, photopolymers and thermo-plastics [9-10].
; fundamental concepts, holographic recording, and materials characterization.
Polymer films are useful as vapor barriers, as flexible structural elements and windows, as electrical substrates, and as piezoelectric and photorefractive materials
. Their mechanical, optical, electrical and barrier properties can often be improved by in-plane film orientation brought about by stretching.
Because they typically involve elaborate apparatus: confocal Fabry-Perot interferometers (4,5), photorefractive materials
(6), high power laser generators and high power laser detectors, these systems can be very expensive, and can themselves add hazards to the working environment.