Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1984-05-11
1985-06-25
Rosenberger, R. A.
Optics: measuring and testing
Range or remote distance finding
With photodetection
356350, 356351, G01B 902
Patent
active
045250286
ABSTRACT:
A magnetic mirror for producing enhanced circular birefringence comprises a thin, semi-transparent film of magneto-optical material deposited on a reflective substrate and having a mangetic field perpendicular to the plane of the film. The magneto-optical film is overcoated with a multilayer dielectric stack to increase the reflectivity of the mirror and thereby reduce the overall loss. The magneto-Kerr rotation resulting upon reflection from the top surface of the magnetic film is enhanced by the Faraday rotation obtained via multiple relections in the magnetic film. Preferably, the magnetic mirror has an overall reflectivity of 99%, making it suitable for use as the nonreciprocal bias element in a ring laser gyro, and the magneto-optical film comprises a layer of MnBi.
REFERENCES:
patent: 3418483 (1968-12-01), Fan
patent: 3851973 (1975-12-01), Macek
patent: 3927946 (1975-12-01), McClure
Krebs et al. "Applications of Magneto-Optics in Ring Laser Gyroscopes", IEEE Transactions on Magnetics, Vol. Mag-16, No. 5, (Sep. 1980), pp. 1179-1184.
"A Manganese Bismuth Magnetic Mirror for the Raytheon Laser Gyroscope", T. A. Dorschner, et al., Proc. 1978 IEEE Nat. Aero & Electr. Conf. (IEEE, New York, 1978), pp. 569-573.
"Manganese Bismuth Magnetic Mirrors" by T. A. Dorschner, 1980 Digests of the International Magnetics Conference, Apr. 21-24, 1980.
Pannone Joseph D.
Raytheon Company
Rosenberger R. A.
Sharkansky Richard M.
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