Abstract

We have developed a new multiplexing method for producing binary computer-generated holograms (CGH’s) for security applications. This method is based on double recording of two types of coding method upon binary CGH’s. The CGH synthesized by the proposed method can have multiple image planes from the region close to the hologram (image region) to infinity (Fraunhofer region) without severe degradation of reconstructed images in the image region. A CGH containing simultaneous image- and Fourier-type holograms is fabricated by electron-beam lithography. Some experimental results are presented.

© 1998 Optical Society of America

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References

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1997 (1)

T. Hamano, O plus E 204, 101 (1997).

1995 (1)

I. M. Lancaster, Proc. SPIE 2577, 71 (1995).
[CrossRef]

1993 (1)

1992 (1)

1990 (1)

1982 (1)

1968 (2)

Appl. Opt. (2)

J. Opt. Soc. Am. (1)

O plus E (1)

T. Hamano, O plus E 204, 101 (1997).

Opt. Lett. (3)

Proc. SPIE (1)

I. M. Lancaster, Proc. SPIE 2577, 71 (1995).
[CrossRef]

Other (2)

Crystagram Technology (Toppan Company, Ltd.).

W. H. Lee, in Progress in Optics XV, E. Wolf, ed. (North-Holland, Amsterdam, 1978).

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Figures (4)

Fig. 1
Fig. 1

CGH’s designed to have multiple image planes from the image region close to holograms to the Fraunhofer region.

Fig. 2
Fig. 2

Three configurations of the SDE: (a) the overwrite grating, (b) the dual overwrite grating, (c) the over–underwrite grating.

Fig. 3
Fig. 3

Surface of the CGH fabricated by electron-beam lithography.

Fig. 4
Fig. 4

Reconstructed images of (a) a P-CGH and (b) a C-CGH.

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