Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1990-12-03
1992-06-30
James, Andrew J.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 53, 359 93, 359 95, 359494, G02F 113
Patent
active
051268698
ABSTRACT:
An optical beam steering device for use in a single-aperture laser transceiver system provides deflection of the transmitted and received beam in two planes, while maintaining the distinctive identities, of each channel respective to their polarizations. The invention utilizes four single-dimensional beam deflecting devices, two for each orthogonal linear polarization of the two transceiver channels, one of these for each steering axis. In addition, a 90.degree. polarization rotator and a quarter-wave plate are included in the arrangement of beam deflecting devices to satisfy the polarization requirements of these devices and of the transceiver channels. In a preferred embodiment, the beam deflecting devices comprise liquid crystal cells functioning as variable phase retarders, each of the cells comprising a first window having a common electrode, a second window having a multiplicity of electrodes in the form of electrically isolated, parallel stripes, and a layer of liquid crystal molecules intermediate the first and second windows. Means are provided for coupling a multiplicity of control signals individually between the multiplicity of stripe electrodes and the common electrode, thereby creating selectable local variations of refractive index in the liquid crystal layer.
REFERENCES:
patent: 4639091 (1987-01-01), Huignard et al.
patent: 4813766 (1989-03-01), Keene et al.
patent: 4937539 (1990-06-01), Grinberg et al.
patent: 4964701 (1990-10-01), Dorschner et al.
patent: 5013140 (1991-05-01), Healey et al.
patent: 5018835 (1991-05-01), Dorschner
"Radar Handbook," Merrill I, Skolnik, Naval Research Laboratory, McGraw-Hill, New York, 1970, pp. 11-1 to 11-21.
Dorschner Terry A.
Lipchak W. Michael
James Andrew J.
Maginniss Christopher L.
Raytheon Company
Sharkansky Richard M.
Tran Minhloan
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