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Pseudoscopic imaging in a double diffraction process with a slit

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Abstract

Pseudoscopic images that keep a continuous parallax are shown to be possible due to a double diffraction process intermediated by a slit. One diffraction grating acts as a wavelength encoder of views while a second diffraction grating decodes the projected image. The process results in the enlargement of the image under common white light illumination.

©2002 Optical Society of America

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Figures (5)

Fig. 1.
Fig. 1. ray-tracing for the symmetrical image of a point white-light object.
Fig. 2.
Fig. 2. ray-tracing scheme for the depth inverted image.
Fig. 3.
Fig. 3. Ray-tracing scheme for rays reaching an observer. Two object points A,B are represented.
Fig. 4.
Fig. 4. (2.5 Mb) Parallax and color change for three point objects (see video). a) left view b) center view c) right view
Fig. 5.
Fig. 5. Image of a halogeneous lamp with reflector. Left: direct image; Right: double diffracted image

Equations (3)

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sin < θ > = < λ > . ν
sin θ i sin θ d = λ . ν
( x x 1 ) ( x x 1 ) 2 + z 2 x 1 x 1 2 + z R 2 = λν
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