Photocopying – Contact printing – Light boxes
Patent
1987-01-27
1988-11-15
LaRoche, Eugene R.
Photocopying
Contact printing
Light boxes
350356, 350393, 357 4, 355 71, G02F 101, G02F 103, HO1L 2712, HO1L 4500
Patent
active
047844760
ABSTRACT:
Various optical modulation systems and methods are disclosed which are based upon modulating the refractive index of a nipi structure. The refractive index modulation is accomplished by applying a controlled voltage differential across the n-doped and p-doped layers of the structure. Staggered contacts to the layers are formed by conductive elements which extend through the structure. One of the elements establishes ohmic contacts with the n layers, and the other with the p-layers. When implemented as an optical spatial phase modulator, one of the nipi contacts is provided as a grid which divides the structure into a matrix of pixel elements, with the other contact comprising separate wires extending through each pixel. A spatial voltage pattern is applied to the pixel wires to inject charge into their corresponding layers, and thereby modulate the refractive indices of the pixels. This imposes a desired spatial phase modulation onto a readout beam transmitted through the nipi structure. Various guided wave applications are also disclosed in which a beam is transmitted through a nipi structure parallel to the n and p layers. The nipi sturcture is not divided into pixels, but rather has a common voltage differential between its n and p layers. The structure's refractive index is spatially modulated by varying this voltage differential, whereby the spatial voltage modulation is transferred onto the beam.
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Efron Uzi
Schulman Joel N.
Duraiswamy V. D.
Hughes Aircraft Company
Karambelas A. W.
LaRoche Eugene R.
Shingleton Michael B.
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