Birefringent optical waveguides of aluminum garnet

Details Birefringent optical waveguides of aluminum garnet Birefringent optical waveguides of aluminum garnet

1991-11-25

1992-12-29

Ullah, Akim E.

Optical waveguides

Planar optical waveguide

Thin film optical waveguide

385141, G02B 137

Patent

active

051757877

ABSTRACT:
This invention provides birefringent optical waveguide structures of crystalline aluminum garnet of a high refractive index which are clad with crystalline aluminum garnet of a lower refractive index. Due to predetermined lattice mismatch between garnet substrate and cladding layer, strain is induced which causes a stress with resultant birefringence in the waveguide layer. When linearly polarized light enters such stressed waveguide in certain orientations, the linear polarization will be preserved by the stress-induced birefringence. These birefringent clad waveguides can be in the form of slabs, channels, ribs, or any of the typical optical waveguide structures. They are useful at high temperature.

REFERENCES:
patent: 3764195 (1973-10-01), Blank et al.
patent: 4092060 (1978-05-01), Nunoshita et al.
patent: 4136350 (1979-01-01), Tien
patent: 4743083 (1988-05-01), Schimpe
patent: 4758092 (1988-07-01), Heinrich et al.
patent: 5113472 (1992-05-01), Gualtieri et al.

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