Higher order diffraction in holography

Details Higher order diffraction in holography Higher order diffraction in holography

1992-03-05

1994-03-01

Arnold, Bruce Y.

Optical: systems and elements

Holographic system or element

Having multiple object beam or diffuse object illumination

359 1, G03H 102, G03H 100

Patent

active

052913201

ABSTRACT:
A method and apparatus for highly efficient use of higher-order diffraction beam in holography. The thermoplastic hologram (10) is recorded at a recording angle (.theta..sub.R) between two coherent beams (12, 14) equal to a first-order diffraction angle (.theta..sub.1) corresponding to the angle (.theta..sub.2) of the desired higher-order beam (18) set to the angular peak (22) of diffraction efficiency (20) of the material of the hologram. On read-out, the desired higher-order beam is read. By use of the invention, the intensity of a higher-order beam can be tuned and made nearly equal to that of the first-order beam. Thereby, useful non-linear holographic systems, such as an associative memory (FIG. 4), can be practically implemented.

REFERENCES:
patent: 3642374 (1972-02-01), Matsumoto et al.
patent: 3778128 (1973-12-01), Hannan
patent: 4904033 (1990-02-01), Ikeda et al.
patent: 4997747 (1991-03-01), Yoshida et al.

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