Abstract

The bandwidth of holographic recording in LiNbO3 (Fe doped) in the 90° geometry is studied theoretically and experimentally. The wide holographic bandwidth of LiNbO3 makes it possible to record submicrometer pixels and reconstruct them by phase conjugation in a holographic memory system. This approach reduces the system cost and increases the system storage density. We demonstrate the recording and the phase-conjugate reconstruction of various pixel sizes down to 1 µm×1 µm. The signal–noise ratio and the bit-error rate are examined.

© 1999 Optical Society of America

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References

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  1. J-J. P. Drolet, E. Chuang, G. Barbastathis, and D. Psaltis, Opt. Lett. 22, 552 (1997).
    [CrossRef] [PubMed]
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    [CrossRef] [PubMed]
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    [CrossRef] [PubMed]
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Figures (5)

Fig. 1
Fig. 1

(a) Compact holographic memory module with phase-conjugate readout. (b) 90° recording geometry. SLM, spatial light modulator; Sig., signal; Ref., reference.

Fig. 2
Fig. 2

Curve (a), experimental data (diamonds) and the theoretical calculation of holographic efficiency in the signal reference plane. Curve (b), experimental data (circles) and the theoretical calculation of the holographic efficiency out of the signal reference plane.

Fig. 3
Fig. 3

Experimental setup for holographic bandwidth measurement: M’s, mirrors; Sig.#1, Sig.#2, signal beams; Ref., reference beam; PM’s, powermeters; λ/2’s, half-wavelength plates. For in-plane measurement, Sig.#2 rotates by θi and is adjusted to have the same intensity as the normally incident Sig.#1 inside the crystal by consideration of the Fresnel reflection loss. The diffraction efficiency of Sig.#2 is then measured relative to the Sig.#1 diffraction efficiency. For out-of-plane measurement, only the Sig.#1 is used, and the crystal and the reference polarization direction rotate by θo about the reference-beam direction.

Fig. 4
Fig. 4

(a) Direct image of a resolution photo mask with pixels from 2 µm×2 µm down to 0.2 µm×0.2 µm. (b) Holographic phase-conjugate reconstruction of the photo mask. Both images were magnified by a Nikon objective lens with a N.A. of 0.65.

Fig. 5
Fig. 5

(a) Phase-conjugate reconstruction of 1 µm×1 µm random data mask hologram. (b) Signal–noise ratio (SNR) of the direct images and the holographic phase-conjugate reconstruction of random binary data with pixel sizes from 8 µm×8 µm down to 1 µm×1 µm.

Equations (1)

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PS=-kxkzk0kx2+ky21/2,-kykzk0kx2+ky21/2,kx2+ky21/2k0.

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