Optics: measuring and testing – Angle measuring or angular axial alignment – Sides of angle or axes being aligned transverse to optical...
Patent
1977-12-27
1980-04-08
Evans, F. L.
Optics: measuring and testing
Angle measuring or angular axial alignment
Sides of angle or axes being aligned transverse to optical...
G02F 103
Patent
active
041970080
ABSTRACT:
Electronically tunable optical filters are disclosed wherein a spatially varying dc electric field is applied to successive regions of a birefringent crystalline medium disposed between a pair of suitably oriented polarizers along the path of a light beam to be filtered. The dc electric field, which may be either parallel or perpendicular to the light path, electro-optically produces in the birefringent medium an effective oscillation of the optic axis of the medium about the pass direction of the input polarizer in a plane perpendicular to the light path as a function of distance along the light path with a predetermined spatial variation to achieve a desired filter transmission characteristic. The electric field is generated from programmable control voltages to provide a wide variety of filter passband or stopband characteristics.
REFERENCES:
patent: 2834254 (1968-05-01), Sage
patent: 3915553 (1975-10-01), Adams et al.
patent: 3938878 (1976-02-01), Fox
Billings, B. H., "The Electro-Optic Effect in Uniaxial Crystals of the Type XH.sub.2 PO.sub.4 ", Journal of the Optical Society of America, vol. 39, No. 10, Oct. 1949, pp. 797-801.
Solc, I., "Birefringent Chain Filter", Journal of the Optical Society of America, vol. 55, No. 6, Jun. 1965, pp. 621-625.
Drichko, et al. "Narrow-Band Electrically Controlled Interference-Polarizing Filter for Solar Physics Studies", Optics & Spectroscopy, vol. 31, No. 3, Sep. 1971, pp. 241-243.
Abrams Richard L.
Lotspeich James F.
Pinnow Douglas A.
Coble Paul M.
Evans F. L.
Hughes Aircraft Company
MacAllister W. H.
Rosenberger R. A.
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