Optical: systems and elements – Optical modulator – Light wave directional modulation
Patent
1990-12-19
1993-05-04
Hille, Rolf
Optical: systems and elements
Optical modulator
Light wave directional modulation
359302, 359723, 359890, 359241, 351 44, G02B 2608, G02B 300, G02B 522, G02F 103
Patent
active
052086984
ABSTRACT:
An optical device that is optically neutral to normal light but absorbs highly collimated light is formed as a mosaic of optical cells. Each cell has at least two refracting surfaces and a non linear material at a focus internal to those surfaces. In one form, the cell comprises two pairs of lenses with a layer of non-linear light absorbent material interposed between the lenses of each pair. The lens elements can be one-power telescopes. A first lens element focuses highly collimated light at its entrance aperture on the non-linear layer. The intensity of the focused light causes the non-linear layer to become opaque or reflective and thereby reduce, or substantially block, the transmission of highly collimated light. The second pair of lenses inverts the re-collimated light exiting the first lens pair. By arranging the optical cells in an array, it is possible to obtain a coherence of the light diffracted from individual cells to produce a wave front from the mosaic as a whole having a resolution that is superior to that of the cells.
REFERENCES:
patent: 3620597 (1971-11-01), Schwartz et al.
patent: 4846561 (1989-07-01), Soileau, Jr. et al.
patent: 4909609 (1990-03-01), McDowell
Hille Rolf
Limanek Robert
The Mitre Corporation
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