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Proceedings Paper

Photorefractive four-wave mixing for optical image restoration
Author(s): Yoshihisa Takayama; Atsushi Okamoto; Kenichi Araki
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Paper Abstract

We describe an optical image restoration by using holographic filtering and photorefractive four-wave mixing. A beam generated by four-wave mixing, that is, the phase conjugate beam, reads a hologram recorded by a blurred image and blur function, where the four-wave mixing process is influenced by an erase beam which has the information of the blur function. We calculate the generation efficiency of the phase conjugate beam and show that the amplitude of the phase conjugate beam can be inversely proportional to the intensity of the erase beam. We also simulate the image restoration by preparing sample images and show that the blur effect can be removed from the distorted image by this method.

Paper Details

Date Published: 2 March 2001
PDF: 9 pages
Proc. SPIE 4353, Laser Optics 2000: Control of Laser Beam Characteristics and Nonlinear Methods for Wavefront Control, (2 March 2001); doi: 10.1117/12.417743
Show Author Affiliations
Yoshihisa Takayama, Communications Research Lab. (Japan)
Atsushi Okamoto, Hokkaido Univ. (Japan)
Kenichi Araki, Communications Research Lab. (Japan)


Published in SPIE Proceedings Vol. 4353:
Laser Optics 2000: Control of Laser Beam Characteristics and Nonlinear Methods for Wavefront Control
Leonid N. Soms; Vladimir E. Sherstobitov, Editor(s)

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