1975-09-23
1977-06-07
Corbin, John K.
350151, 350157, G02B 2700
Patent
active
040279499
ABSTRACT:
An optical system for selectively modulating one or more colors of light in a polychromatic light beam. Using a laser source, all colors are initially plane polarized in a preferred direction. Any selected color is modulated using an electro-optic cell with an optical waveplate both before and following. The first waveplate rotates the direction of polarization of that selected color or another color to a direction at 45.degree. to the preferred direction. The electro-optic cell resolves incident light, solely of the selected color, into two right angle components polarized at .+-.45.degree. to the polarization of said another color. The relative amplitudes of the components is determined by an electrical signal applied to the cell. The second waveplate also rotates the direction of polarization of said selected color or said another color by 45.degree.. A final optical analyzer passes one component of all modulated colors while inhibiting the other component.
REFERENCES:
patent: 2753763 (1956-07-01), Haines
patent: 2780958 (1957-02-01), Wiley
patent: 3813144 (1974-05-01), Kumada et al.
Corbin John K.
Redifon Limited
Rosenberger Richard A.
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