Ferrimagnetic faraday elements for ring lasers

Details Ferrimagnetic faraday elements for ring lasers Ferrimagnetic faraday elements for ring lasers

H - Electricity

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S

345/10

H01S 3/083 (2006.01) G01C 19/68 (2006.01) G02F 1/09 (2006.01)

Patent

CA 1115396

FERRIMAGNETIC FARADAY ELEMENTS FOR RING LASERS 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 anti- reflection coating on the composite reduces reflections. Re- flections 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 mag- netic properties, desired indices of refraction, and desired match- ing 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. -1-

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