Abstract

We report the experimental demonstration of a photorefractive dynamic holographic memory that has a simple feedback architecture stabilized through a novel spatial sampling technique. By using dynamic copying to compensate for photorefractive decay, this memory provides nondestructive readout, selective erasure and rewriting, and real-time adaptation of holograms through an arbitrarily large number of exposures.

© 1992 Optical Society of America

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References

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  1. D. Brady, K. Hsu, D. Psaltis, Opt. Lett. 15, 817 (1990).
    [CrossRef] [PubMed]
  2. Y. Qiao, D. Psaltis, C. Gu, J. Hong, P. Yeh, R. R. Neurgaonkar, J. Appl. Phys. 70, 4646 (1991).
    [CrossRef]
  3. H. Sasaki, Y. Fainman, J. E. Ford, Y. Taketomi, S. H. Lee, Opt. Lett. 16, 1874 (1991).
    [CrossRef] [PubMed]
  4. S. Boj, G. Pauliat, G. Roosen, Opt. Lett. 17, 438 (1992).
    [CrossRef] [PubMed]
  5. K.-Y. Hsu, H.-Y. Li, D. Psaltis, Proc. IEEE 78, 1637 (1990).
    [CrossRef]
  6. J. H. Hong, R. Saxena, Opt. Lett. 16, 180 (1991).
    [PubMed]
  7. R. McRuer, J. Wilde, L. Hesselink, J. Goodman, Proc. Soc. Photo-Opt. Instrum. Eng. 881, 192 (1988).
  8. Y. Taketomi, J.E. Ford, H. Sasaki, J. Ma, Y. Fainman, S. H. Lee, Opt. Lett. 16, 1774 (1991).
    [CrossRef] [PubMed]
  9. K. BlXtekjaer, Appl. Opt. 18, 57 (1979).
    [CrossRef]
  10. D. Psaltis, D. Brady, K. Wagner, Appl. Opt. 27, 1752 (1988).
    [CrossRef]

1992 (1)

1991 (4)

1990 (2)

K.-Y. Hsu, H.-Y. Li, D. Psaltis, Proc. IEEE 78, 1637 (1990).
[CrossRef]

D. Brady, K. Hsu, D. Psaltis, Opt. Lett. 15, 817 (1990).
[CrossRef] [PubMed]

1988 (2)

D. Psaltis, D. Brady, K. Wagner, Appl. Opt. 27, 1752 (1988).
[CrossRef]

R. McRuer, J. Wilde, L. Hesselink, J. Goodman, Proc. Soc. Photo-Opt. Instrum. Eng. 881, 192 (1988).

1979 (1)

BlXtekjaer, K.

Boj, S.

Brady, D.

Fainman, Y.

Ford, J. E.

Ford, J.E.

Goodman, J.

R. McRuer, J. Wilde, L. Hesselink, J. Goodman, Proc. Soc. Photo-Opt. Instrum. Eng. 881, 192 (1988).

Gu, C.

Y. Qiao, D. Psaltis, C. Gu, J. Hong, P. Yeh, R. R. Neurgaonkar, J. Appl. Phys. 70, 4646 (1991).
[CrossRef]

Hesselink, L.

R. McRuer, J. Wilde, L. Hesselink, J. Goodman, Proc. Soc. Photo-Opt. Instrum. Eng. 881, 192 (1988).

Hong, J.

Y. Qiao, D. Psaltis, C. Gu, J. Hong, P. Yeh, R. R. Neurgaonkar, J. Appl. Phys. 70, 4646 (1991).
[CrossRef]

Hong, J. H.

Hsu, K.

Hsu, K.-Y.

K.-Y. Hsu, H.-Y. Li, D. Psaltis, Proc. IEEE 78, 1637 (1990).
[CrossRef]

Lee, S. H.

Li, H.-Y.

K.-Y. Hsu, H.-Y. Li, D. Psaltis, Proc. IEEE 78, 1637 (1990).
[CrossRef]

Ma, J.

McRuer, R.

R. McRuer, J. Wilde, L. Hesselink, J. Goodman, Proc. Soc. Photo-Opt. Instrum. Eng. 881, 192 (1988).

Neurgaonkar, R. R.

Y. Qiao, D. Psaltis, C. Gu, J. Hong, P. Yeh, R. R. Neurgaonkar, J. Appl. Phys. 70, 4646 (1991).
[CrossRef]

Pauliat, G.

Psaltis, D.

Y. Qiao, D. Psaltis, C. Gu, J. Hong, P. Yeh, R. R. Neurgaonkar, J. Appl. Phys. 70, 4646 (1991).
[CrossRef]

K.-Y. Hsu, H.-Y. Li, D. Psaltis, Proc. IEEE 78, 1637 (1990).
[CrossRef]

D. Brady, K. Hsu, D. Psaltis, Opt. Lett. 15, 817 (1990).
[CrossRef] [PubMed]

D. Psaltis, D. Brady, K. Wagner, Appl. Opt. 27, 1752 (1988).
[CrossRef]

Qiao, Y.

Y. Qiao, D. Psaltis, C. Gu, J. Hong, P. Yeh, R. R. Neurgaonkar, J. Appl. Phys. 70, 4646 (1991).
[CrossRef]

Roosen, G.

Sasaki, H.

Saxena, R.

Taketomi, Y.

Wagner, K.

Wilde, J.

R. McRuer, J. Wilde, L. Hesselink, J. Goodman, Proc. Soc. Photo-Opt. Instrum. Eng. 881, 192 (1988).

Yeh, P.

Y. Qiao, D. Psaltis, C. Gu, J. Hong, P. Yeh, R. R. Neurgaonkar, J. Appl. Phys. 70, 4646 (1991).
[CrossRef]

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Figures (6)

Fig. 1
Fig. 1

Schematic diagram of the sampled dynamic holographic memory.

Fig. 2
Fig. 2

Illustration of the spatial sampling technique for stabilizing the feedback loop, in which the small dots represent the sampling points on the reading side of the LCLV and the large circles represent the magnified pixels of the feedback image.

Fig. 3
Fig. 3

Simplified system diagram.

Fig. 4
Fig. 4

Steady-state behavior of the dynamic memory. Curve (a), α2Awij(0) < u0; curve (b), α2Awij(0) > u0.

Fig. 5
Fig. 5

Examples of images dynamically stored in the crystal: (a) with sampling, (b) without sampling.

Fig. 6
Fig. 6

Experimental results: (a) the diffracted signals of ten angularly multiplexed holograms recorded with equal exposure, (b) the equalized holograms after dynamic copying, (c) selective erasure of the fifth hologram, (d) the other nine holograms rejuvenated by dynamic copying after being partially erased during selective erasure, (e) rewriting of the fifth hologram.

Equations (3)

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G [ u ] { 0 u u 0 , ( u u 0 ) g u 0 u u 1 , y sat ( u 1 u 0 ) g u u 1 . ,
x i = α 2 [ α 1 y i + A w i j ( 0 ) ] .
τ t d w i j / d t = w i j + c α 1 y sat / A ,

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