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Dynamic holographic 3-D image projection

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Abstract

The display of dynamic holographic images is possible by computing the hologram of objects in a three-dimensional scene and then transcribing the two-dimensional digital hologram onto a digital micromirror system illuminated with coherent light. Proof-of-principle instruments that reconstruct real and virtual images are described. The underlying process, its characteristics, limitations and utility are discussed.

©2003 Optical Society of America

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Figures (5)

Fig. 1.
Fig. 1. Schematic of DMD hologram projection system for (a) real and (b) virtual images.
Fig. 2.
Fig. 2. Bipmap-image layout to demonstrate 3-D image projection with a DMD hologram.
Fig. 3.
Fig. 3. The bit-map computed hologram for the volume in Fig. 2.
Fig. 4.
Fig. 4. (a) The reconstructed portion of the real 3-D image at 30 cm from the converging lens, (b) the reconstructed portion of the real 3-D image at 27.5 cm from converging lens, and (c) the virtual image looking into the DMD, the conventional way to view a hologram. The photographs were taken with a Nikon Coolpix990 digital camera.
Fig. 5.
Fig. 5. (872kb) Frame with a helicopter and jets from a movie illustrating the dynamic display capability of the DMD holographic projection system.

Equations (1)

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U s x y = v d v U x y z z 2 + ( x x ) 2 + ( y y ) 2 exp [ ik ( z 2 + ( x x ) 2 + ( y y ) 2 x 2 + y 2 2 f ) ]
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