Abstract

Dynamic speckle multiplexing scheme in volume holographic data storage is proposed, since it offers a novel multiplexing geometry, and could be combined with other schemes to make the full use of the dynamic ranges. In this scheme, a random diffuser is added in the original reference path of the classical 90° setup. In this paper, we analyzed the propagation of the speckle field in the holographic system and established the related theoretical model based on the dynamic speckle auto-correlation function and diffraction theory. We successfully realized the dynamic speckle multiplexing in our experimental system and reached a storage density of 4.6 Gigapixels/cm3 based on the DPL laser source.

© 2003 Optical Society of America

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References

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Appl. Opt. (1)

J. Imaging Sci. Technol. (1)

V. Markov, �??Spatial-angular selectivity of 3-D speckle-wave holograms and information storage,�?? J. Imaging Sci. Technol. 41, 383-388 (1997)

Opt. Lett. (4)

Opt. Spectroscopy (1)

Darskii A.M. and Markov, V., �??Shift selectivity of the holograms with a reference speckle wave,�?? Opt. Spectroscopy 65, 392-395 (1988).

Proc. SPIE (3)

Peikun zhang, Qingsheng He, Guofan Jin, �??A novel speckle angular-shift multiplexing for high-density holographic storage,�?? Proceedings of SPIE 4081, 236-241 (2000
[CrossRef]

A.Darsky, V. Markov, �??Information capacity of holograms with reference speckle wave,�?? Proc. SPIE 1509, 36-46 (1991)
[CrossRef]

Darskii A.M. Markov V.B, �??Some properties of 3D holograms with a reference speckle-wave and their application to information storage,�?? Proc. SPIE 1600, 318-332 (1992)
[CrossRef]

Science (1)

J. F. heanue, M. C. Bashaw, and L. Hesselink, �??Volume holographic storage and rettieval of digital date,�?? Science 256, 749-752 (1994)
[CrossRef]

Other (1)

Jinnan Wang, Qingsheng He, Dong Huang, �??High density Volume holography data storage based on Speckle Angular Multiplexing,�?? OSA Annual Meeting, (2002)

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Figures (3)

Fig. 1.
Fig. 1.

Geometry of the hologram recording by signal plane wave S0(r) and dynamical speckle reference wave RW(r). Here T is the thickness of volume hologram. DL is the distance from the hologram front surface to random-phase diffuser. Δ is the shift of the diffuser.

Fig. 2.
Fig. 2.

Calculated dependence of the normalized diffratcted beam intensity IDNy) on shift Δy at reconstruction with different speckle sizes δ.

Fig. 3.
Fig. 3.

The shifting selectivity ΔyHW as a function of the distance DL from the hologram front surface to random phase diffuser

Equations (8)

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δ ε ( r ) E 2 = S 0 ( r ) + R w ( r ) 2 S 0 ( r ) R W * ( r )
S ( r ) = k 0 2 δ ε ( r ) R R ( r ) G ( r , r ) d V
S ( r ) Γ ( r , r ) d V
Γ ( r , r ) = R W * ( r ) R R ( r ) = π ω 0 2 2 2 ω ( z 0 ) λ 2 z 2 exp ( Δ y 2 2 ω 2 ( z 0 ) )
× exp ( π 2 ω 2 ( z 0 ) Δ y 2 2 λ 2 z 2 [ 1 + z ρ ( z 0 ) ] 2 ) × exp ( i 2 π Δ y λz y )
I DN ( Δ y ) = exp ( Δ y 2 ω 2 ( z 0 ) ) V 1 z 2 exp ( π 2 ω 2 ( z 0 ) Δ y 2 2 λ 2 z 2 [ 1 + z ρ ( z 0 ) ] 2 ) exp ( i 2 π Δ y λz y ) d x d y dz 2 V 1 z 2 d x d y dz 2
S ( δ θ A , q ) = exp ( k 0 sin θ s ) t 0 2 0 T 1 z δ θ A exp { i k 0 δ θ A d L ( z δ θ A + 2 y ) } J 1 ( k 0 ϕ L δ θ A 2 d L z ) dz
I D ( δ θ A ) I D max = 1 π ( 4 d L k 0 D H ϕ L T ) 0 q 2 D H 2 4 S δ θ A q ¯ 2 d 2 q

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