Apparatus for controlling the rotation of the plane of linear po

Details Apparatus for controlling the rotation of the plane of linear po Apparatus for controlling the rotation of the plane of linear po

1984-03-19

1986-08-26

Punter, William H.

G02F 109

Patent

active

046079165

ABSTRACT:
Apparatus employing a light beam to affect another light beam. A primary beam of linearly polarized monochromatic light is directed on an element of chromium chalcogenide spinel magnetic semiconductor, specifically single crystal CdCr.sub.2 Se.sub.4. A control beam of monochromatic light is selectively elliptically polarized and directed at the element. As the light beams traverse the same path through the element the circularly polarized control beam interacts with the element thereby changing the effect of the element on the linearly polarized primary beam to rotate the plane of linear polarization of the primary beam. A linear polarization analyzer receives the primary beam from the element and passes, blocks, or diverts light depending upon the plane of linear polarization of the incident light.

REFERENCES:
patent: 4190811 (1980-02-01), Alcock et al.
Golik et al., "Magnetooptic Properties of CdCr.sub.2 Se.sub.4 Single Crystals Near the Absorption Edge", Sov. Phys. Solid State 3-1980, pp. 512-513.
Genkin et al., "Direct Observation of Photomagnetization of the Ferromagnet Cd Cr.sub.2 Se.sub.4 by Circularly Polarized Light", Jetdlett 2-1982, pp. 199-202.
Nguyen et al., "Fast Optically Controlled Modulator for a CO.sub.2 Laser Using Two-Photon Magnetoabsorption Effects in CdS", Appl. Phys. Lett. 11-1977, pp. 603-606.
Sanford et al., "Influence of Polarized Optical Pumping on the Ferromagnetism of CdCr.sub.2 Se.sub.4, Phys. Rev. Lett. 5-1983, pp. 1803-1806.

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