Abstract

A real-time holographic associative memory that combines holography with phase conjugation is proposed. In the memory a type of doped LiNbO3 is used as a holographic recording medium and as a phase-conjugate mirror that provides optical feedback, thresholding, and gain. The device can store information and recall a complete image when only a portion of the stored image is input to the system. An outline of the principles and the experimental results are given, and the system’s addressing ability and selectivity are demonstrated.

© 1990 Optical Society of America

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References

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1987 (2)

1986 (5)

1985 (4)

1984 (1)

A. Fisher, C. L. Giles, J. Lee, J. Opt. Soc. Am. A 1, 1337 (1984).

1982 (1)

P. Günter, Phys. Rep. 93, 199 (1982).
[CrossRef]

Anderson, D.

Athale, R.

Caulfield, H. J.

Dunning, G. J.

Eichmann, G.

Farhat, N.

Fisher, A.

A. Fisher, C. L. Giles, J. Lee, J. Opt. Soc. Am. A 1, 1337 (1984).

Friedlander, C.

Giles, C. L.

A. Fisher, C. L. Giles, J. Lee, J. Opt. Soc. Am. A 1, 1337 (1984).

Günter, P.

P. Günter, Phys. Rep. 93, 199 (1982).
[CrossRef]

Kwong, S.

A. Yariv, S. Kwong, Opt. Lett. 11, 186 (1986).
[CrossRef] [PubMed]

A. Yariv, S. Kwong, K. Kyuma, Appl. Phys. Lett. 48, 1114 (1986).
[CrossRef]

Kyuma, K.

A. Yariv, S. Kwong, K. Kyuma, Appl. Phys. Lett. 48, 1114 (1986).
[CrossRef]

Lee, J.

A. Fisher, C. L. Giles, J. Lee, J. Opt. Soc. Am. A 1, 1337 (1984).

Mada, H.

Marom, E.

Owechko, Y.

Paek, E.

Prata, A.

Psaltis, D.

Soffer, B. H.

Szu, H.

Yariv, A.

A. Yariv, S. Kwong, Opt. Lett. 11, 186 (1986).
[CrossRef] [PubMed]

A. Yariv, S. Kwong, K. Kyuma, Appl. Phys. Lett. 48, 1114 (1986).
[CrossRef]

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Figures (5)

Fig. 1
Fig. 1

Schematic of the all-optical associative memory incorporating holography and phase conjugation. BS, beam splitter; f, focal length of the Fourier lens.

Fig. 2
Fig. 2

Experimental setup of the real-time holographic associative memory. M1–M4, mirrors; BS1–BS4, beam splitters; SF, spatial filter; BE, beam expander.

Fig. 3
Fig. 3

Experimental results of the real-time holographic associative memory: (a) the image of the stored object, (b) the partial input image, (c) the associated output image.

Fig 4
Fig 4

Experimental results of system’s addressing ability: (a) the image stored in memory, (b) the image recalled when the input is 50% of the complete image, (c) the image recalled when the input is 25% of the complete image information.

Fig. 5
Fig. 5

Experimental results of system’s selectivity: (a) two images stored by a double-exposure hologram, (b) the partial input images, (c) the corresponding associated output images.

Equations (1)

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T i = 1 N ( O i * R i + c . c . ) ,

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