Abstract

We have performed hologram multiplexing with a cw laser at λ=532 nm in a near-stoichiometric LiNbO3:Tb,Fe crystal that exhibits a visible absorption band induced by UV light. When 50 plane-wave holograms were angle multiplexed from the UV preexposed state, the recording sensitivity gradually decreased, owing to bleaching of the induced absorption. However, a conventional recording schedule of multiplexing many holograms of equal diffraction efficiency can be used in this photochromic material. The gradual decrease in recording sensitivity throughout multiplexing can be compensated for by the increased erasure-time constants of later-written holograms. An M/# of 1.73 was obtained in a crystal of 3.3-mm thickness.

© 2000 Optical Society of America

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

2000

M. Lee, S. Takekawa, Y. Furukawa, K. Kitamura, and H. Hatano, Phys. Rev. Lett. 84, 875 (2000).
[CrossRef] [PubMed]

M. Lee, S. Takekawa, Y. Furukawa, K. Kitamura, and H. Hatano, Appl. Phys. Lett. 76, 1653 (2000).
[CrossRef]

1999

1998

K. Buse, A. Adibi, and D. Psaltis, Nature 393, 665 (1998).
[CrossRef]

1996

1974

D. L. Staebler and W. Phillips, Appl. Phys. Lett. 24, 268 (1974).
[CrossRef]

Adibi, A.

A. Adibi, K. Buse, and D. Psaltis, Opt. Lett. 24, 652 (1999).
[CrossRef]

K. Buse, A. Adibi, and D. Psaltis, Nature 393, 665 (1998).
[CrossRef]

Burr, G. W.

Buse, K.

A. Adibi, K. Buse, and D. Psaltis, Opt. Lett. 24, 652 (1999).
[CrossRef]

K. Buse, A. Adibi, and D. Psaltis, Nature 393, 665 (1998).
[CrossRef]

Furukawa, Y.

M. Lee, S. Takekawa, Y. Furukawa, K. Kitamura, and H. Hatano, Phys. Rev. Lett. 84, 875 (2000).
[CrossRef] [PubMed]

M. Lee, S. Takekawa, Y. Furukawa, K. Kitamura, and H. Hatano, Appl. Phys. Lett. 76, 1653 (2000).
[CrossRef]

Hatano, H.

M. Lee, S. Takekawa, Y. Furukawa, K. Kitamura, and H. Hatano, Appl. Phys. Lett. 76, 1653 (2000).
[CrossRef]

M. Lee, S. Takekawa, Y. Furukawa, K. Kitamura, and H. Hatano, Phys. Rev. Lett. 84, 875 (2000).
[CrossRef] [PubMed]

Kitamura, K.

M. Lee, S. Takekawa, Y. Furukawa, K. Kitamura, and H. Hatano, Phys. Rev. Lett. 84, 875 (2000).
[CrossRef] [PubMed]

M. Lee, S. Takekawa, Y. Furukawa, K. Kitamura, and H. Hatano, Appl. Phys. Lett. 76, 1653 (2000).
[CrossRef]

Lee, M.

M. Lee, S. Takekawa, Y. Furukawa, K. Kitamura, and H. Hatano, Appl. Phys. Lett. 76, 1653 (2000).
[CrossRef]

M. Lee, S. Takekawa, Y. Furukawa, K. Kitamura, and H. Hatano, Phys. Rev. Lett. 84, 875 (2000).
[CrossRef] [PubMed]

Mok, F. H.

Phillips, W.

D. L. Staebler and W. Phillips, Appl. Phys. Lett. 24, 268 (1974).
[CrossRef]

Psaltis, D.

Staebler, D. L.

D. L. Staebler and W. Phillips, Appl. Phys. Lett. 24, 268 (1974).
[CrossRef]

Takekawa, S.

M. Lee, S. Takekawa, Y. Furukawa, K. Kitamura, and H. Hatano, Phys. Rev. Lett. 84, 875 (2000).
[CrossRef] [PubMed]

M. Lee, S. Takekawa, Y. Furukawa, K. Kitamura, and H. Hatano, Appl. Phys. Lett. 76, 1653 (2000).
[CrossRef]

Appl. Phys. Lett.

D. L. Staebler and W. Phillips, Appl. Phys. Lett. 24, 268 (1974).
[CrossRef]

M. Lee, S. Takekawa, Y. Furukawa, K. Kitamura, and H. Hatano, Appl. Phys. Lett. 76, 1653 (2000).
[CrossRef]

Nature

K. Buse, A. Adibi, and D. Psaltis, Nature 393, 665 (1998).
[CrossRef]

Opt. Lett.

Phys. Rev. Lett.

M. Lee, S. Takekawa, Y. Furukawa, K. Kitamura, and H. Hatano, Phys. Rev. Lett. 84, 875 (2000).
[CrossRef] [PubMed]

Other

P. Gunter and J.-P. Huignard, eds., Photorefractive Materials and Their Applications (Springer-Verlag, Berlin, 1988), Vol. 1.
[CrossRef]

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Figures (5)

Fig. 1
Fig. 1

Recording and readout characteristics measured before and after UV irradiation. Total recording intensity, 260 mW/cm2 at 532 nm; UV preexposure time, 10 s at an intensity of 700 mW/cm2.

Fig. 2
Fig. 2

Sequence of preexposure, recording, readout, and erasure. Total recording intensity, 866 mW/cm2 at λ=532 nm; UV intensity, 700 mW/cm2; external angle of the recording beams, 90°.

Fig. 3
Fig. 3

Variation of sensitivity during multiplexing. As the UV-induced absorption (with UV preexposure) is bleached by the recording light, the recording sensitivity gradually decreases during multiplexing. In this measurement, each hologram was recorded for 30 s at an intensity of 315 mW/cm2, with an angular separation of 0.1°.

Fig. 4
Fig. 4

50 plane-wave holograms stored without UV preexposure. Equation (2), with τe=1500 s, was used as the recording schedule t1=56 s,t50=20 s.

Fig. 5
Fig. 5

Angle-multiplexing of 50 plane-wave holograms after UV preexposure, recorded (a) with an identical recording time tm=20 s for all holograms and (b) based on Eq. (2), with τe=1200 s (t1=59 s, t50=17.5 s).

Equations (2)

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S=ηtt=0IL,
tm-1=tm exptm/τe,

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