Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1978-02-23
1980-09-16
McGraw, Vincent P.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
350151, G01B 902, G01P 900
Patent
active
042226686
ABSTRACT:
A ring laser having a Faraday cell for biasing the mode locking region beyond the range of rotation rates of interest. The Faraday element included in the cell is a composite comprising a monocrystalline thin film of a ferrimagnetic material epitaxially deposited on a non-magnetic single crystal substrate. An antireflection coating on the composite reduces reflections. Reflections are further reduced by the selection of thickness and index of refraction for the layers of the composite. Selected substituents are used in garnet layers to achieve desired magnetic properties, desired indices of refraction, and desired matching of the lattice parameter from layer to layer to minimize internal stresses. Where a composite is provided with a reflection coating on one side thereof, it is adapted to serve as an optical cavity forming corner reflector.
REFERENCES:
patent: 3890047 (1975-06-01), Warner
patent: 3927946 (1975-12-01), McClure
"Ferrimagnetic Garnets as Laser Gyro Faraday Element;" Henry et al.; a paper presented at The Ninth Annual Electro-Optics & Laser Conference, Anaheim, California; Oct. 25, 1977.
"Fabrication of Thin Film Magnetic Garnet Structures for Intra-Cavity Laser Applications"; Whitcomb et al.; a paper presented to 23 Conference on Magnetism & Magnetic Materials; Nov. 8-11, 1977.
"Garnets with High Magnetooptic Figures of Merit in the Visible Region;" Lacklison et al.; IEEE Transaction of Magnetics, vol. Mag. 9 #3; Sep. 73; pp. 457-460.
"Multilayer Magneto-Optic Structure;" Wieder; IBM Technical Disclosure Bulletin; vol. 15 #6; Nov. 72; p. 1792.
Friedman Gilbert H.
Hamann H. Fredrick
McGraw Vincent P.
Rockwell International Corporation
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