Abstract

We investigate the feasibility of designing spectral diversity filters using spherical beam volume holograms. Our experimental results qualitatively show the separation of the information of different incident wavelength channels using spherical beam volume holograms. The major trade-off in using these holograms is between the degree of spatial spectral diversity and the number of allowed spatial modes (or the divergence angle) of the incident beam.

© 2004 Optical Society of America

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References

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Appl. Opt. (3)

Opt. Express (1)

Opt. Lett. (3)

D. Brady, ???Multiplex sensors and the constant radiance theorem,??? Opt. Lett. 27, 16-18 (2002).
[CrossRef]

F. H. Mok, G. W. Burr, and D. Psaltis, ???System metric for holographic memory systems,??? Opt. Lett. 21, 96- 898 (1996).
[CrossRef] [PubMed]

D. Psaltis, F. Mok, and H. Li, ???Nonvolatile storage in photorefractive crystals,??? Opt. Lett. 19, 210-212 1994).
[CrossRef] [PubMed]

Proc. SPIE (1)

D.A. Waldman, R.T. Ingwall, P.K. Dal, M.G. Horner, E.S. Kolb, H.-Y.S. Li, R.A. Minus, and H.G. Schild, Cationic ring-opening photopolymeriztion methods for holography,??? Proc. SPIE 2689¸127-141 (1996).
[CrossRef]

Other (2)

H. J. Coufal, D. Psaltis, G. T. Sincerbox (Eds.), Holographic Data Storage, Springer (2000).

Aprilis, Inc. <a href= "http://www.aprilisinc.com">http://www.aprilisinc.com</a>

Supplementary Material (2)

» Media 1: MPG (863 KB)     
» Media 2: MPG (708 KB)     

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Figures (7)

Fig. 1.
Fig. 1.

Basic schematic of the recoding geometry of the SBVH. d=16 mm, f=2.5cm, L=200µm, θ1=10°, θ2=46°, λ=532 nm. The angles are measured in air. The size of the hologram is 8mm by 8mm. For rotation multiplexing, the recording medium is rotated about the z-axis.

Fig. 2.
Fig. 2.

Reading SBVHs with a monochromatic collimated beam and imaging the back face of the hologram. The light source is far enough from the hologram aperture to approximate a collimated reading beam.

Fig. 3.
Fig. 3.

Reading SBVHs with a collimated white light source. The diffracted light focuses on a white screen and a digital camera takes its picture.

Fig. 4.
Fig. 4.

(862 KB movie) Output pattern of a single SBVH illuminated by a collimated monochromatic beam as the wavelength of the incident beam is continuously scanned from 600nm to 910nm. The dark crescent moves as the wavelength is scanned.

Fig. 5.
Fig. 5.

Diffracted beam from a SBVH illuminated by a collimated white light source measured using the experimental setup in Fig. 3.

Fig. 6.
Fig. 6.

(707 KB movie) Output pattern of a complex volume hologram (formed by rotation multiplexing of 8 SBVHs) illuminated by a collimated monochromatic beam as the wavelength of the incident beam is scanned from 644nm to 878nm. The output multi-crescent pattern changes as the wavelength is scanned.

Fig. 7.
Fig. 7.

Effect of the divergence angle of the reading beam on the spectral diversity of the SBVHs. A single SBVH is read at λ=532nm with (a) a collimated monochromatic beam, (b) spherical beam with divergence angle of 20° (full angle in air), (c) diffuse light where the diffuser is 27.5cm far from the hologram in the setup of Fig. 2, (d) diffuse light where the diffuser is 2.5cm far from the hologram in the setup of Fig. 2.

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