Abstract

A coherent optical memory is described. The device operates on the principle that an optical resonator employing a holographic grating can have user-prescribed eigenmodes. Each information entity (e.g., an image of a cat) defines an eigenmode of the resonator. The stored information is accessed by injecting partial information (e.g., an image of the cat’s ear) into the resonator. A gain medium internal to the resonator amplifies the field belonging to the eigenmode that most resembles the injected field; the other eigenmodes are suppressed through a competition for the gain. A simple optical memory exhibiting associative recall is demonstrated.

© 1986 Optical Society of America

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References

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    [CrossRef] [PubMed]
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    [CrossRef]
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    [CrossRef]
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    [CrossRef] [PubMed]
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    [CrossRef] [PubMed]
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    [CrossRef]
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    [CrossRef] [PubMed]

1985

1982

J. O. White, M. Cronin-Golomb, B. Fischer, A. Yariv, Appl. Phys. Lett. 40, 450 (1982).
[CrossRef]

K. E. Oughstun, Opt. Commun. 42, 72 (1982).
[CrossRef]

W. W. Chow, Opt. Lett. 7, 417 (1982).
[CrossRef] [PubMed]

1978

1977

1971

M. B. Spencer, W. E. Lamb, Phys. Rev. A 5, 884 (1971).
[CrossRef]

1966

Bloom, D.M.

Chow, W. W.

Cooke, D. J.

See, for example, L. Solymar, D. J. Cooke, Volume Holography and Volume Gratings (Academic, New York, 1981).

Cronin-Golomb, M.

J. O. White, M. Cronin-Golomb, B. Fischer, A. Yariv, Appl. Phys. Lett. 40, 450 (1982).
[CrossRef]

Economou, N. P.

Feinberg, J.

J. Feinberg, in Phase Conjugation, R. Fisher, ed. (Academic, New York, 1981), Chap. 11 and references therein.

Fischer, B.

J. O. White, M. Cronin-Golomb, B. Fischer, A. Yariv, Appl. Phys. Lett. 40, 450 (1982).
[CrossRef]

Kogelnik, H.

Kwong, S.-K.

Lamb, W. E.

M. B. Spencer, W. E. Lamb, Phys. Rev. A 5, 884 (1971).
[CrossRef]

M. Sargent, M. O. Scully, W. E. Lamb, Laser Physics (Addison-Wesley, Boston, Mass., 1974), Chap. 9.

Li, T.

Liao, P. F.

Oughstun, K. E.

K. E. Oughstun, Opt. Commun. 42, 72 (1982).
[CrossRef]

Pepper, D. M.

Sargent, M.

M. Sargent, M. O. Scully, W. E. Lamb, Laser Physics (Addison-Wesley, Boston, Mass., 1974), Chap. 9.

Scully, M. O.

M. Sargent, M. O. Scully, W. E. Lamb, Laser Physics (Addison-Wesley, Boston, Mass., 1974), Chap. 9.

Solymar, L.

See, for example, L. Solymar, D. J. Cooke, Volume Holography and Volume Gratings (Academic, New York, 1981).

Spencer, M. B.

M. B. Spencer, W. E. Lamb, Phys. Rev. A 5, 884 (1971).
[CrossRef]

White, J. O.

J. O. White, M. Cronin-Golomb, B. Fischer, A. Yariv, Appl. Phys. Lett. 40, 450 (1982).
[CrossRef]

Yariv, A.

Appl. Opt.

Appl. Phys. Lett.

J. O. White, M. Cronin-Golomb, B. Fischer, A. Yariv, Appl. Phys. Lett. 40, 450 (1982).
[CrossRef]

Opt. Commun.

K. E. Oughstun, Opt. Commun. 42, 72 (1982).
[CrossRef]

Opt. Lett.

Phys. Rev. A

M. B. Spencer, W. E. Lamb, Phys. Rev. A 5, 884 (1971).
[CrossRef]

Other

M. Sargent, M. O. Scully, W. E. Lamb, Laser Physics (Addison-Wesley, Boston, Mass., 1974), Chap. 9.

See, for example, L. Solymar, D. J. Cooke, Volume Holography and Volume Gratings (Academic, New York, 1981).

J. Feinberg, in Phase Conjugation, R. Fisher, ed. (Academic, New York, 1981), Chap. 11 and references therein.

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Figures (3)

Fig. 1
Fig. 1

Holographic linear resonator memory. (a) Recording of holograms (storage of information). (b) Recall by injected signal. In this case gain is supplied by the phase-conjugating mirror.

Fig. 2
Fig. 2

Holographic ring resonator memory. (a) Recording of hologram. (b) Recall by injected signal. Gain is supplied by a pumped photorefractive medium.

Fig. 3
Fig. 3

Demonstration of a coherent optical eigenstate memory exhibiting associative recall using a ring holographic resonator. Stored objects are two pairs of dots, together forming a square of dots. The eigenmodes correspond to the diagonal pairs of spots. (a) Injected signal (lower two dots of square on lower left screen) is blocked from the resonator. With no injected signal both eigenmodes oscillate. The upper screen shows the output (four dots). (b) With lower right-hand dot injected, one eigenmode oscillates and the second is largely suppressed. (c) With lower left-hand dot injected, the second eigenmode oscillates and the first is suppressed.

Equations (2)

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f = i = 1 a i O i ,
a i = O i f .

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