Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1992-04-09
1993-10-12
Buczinski, Stephen C.
Optics: measuring and testing
Range or remote distance finding
With photodetection
2502032, 356141, 359 94, 359283, 359298, G01C 308, G01B 1126, G01J 120, G02F 113
Patent
active
052530337
ABSTRACT:
An optical beam steering device for use in a single-aperture laser transceiver system provides deflection of the transmitted and received beams 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: 4846571 (1989-07-01), Jelalian et al.
patent: 5114226 (1992-05-01), Goodwin et al.
Dorschner Terry A.
Lipchak W. M.
Buczinski Stephen C.
Dawson Walter F.
Raytheon Company
Sharkansky Richard M.
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