Rca Inc.

William Phillips

Jacob M Hammer

David L Staebler

Clyde C Neil

Brown F Williams

William J Burke

Enhanced optical coupling by phase evanescent fields is achieved by covering the planar layer of a waveguide with a thin metal oxide film incorporating a relief phase grating. The grating is originally formed in a metallic film covering the planar layer, which metallic film is converted to a metal oxide film by heating in an oxygen-containing atmosphere.

Method for making planar optical waveguide comprising thin metal oxide

Planar optical waveguide comprising thin metal oxide film incorporating

This invention relates to a wave device comprising a single domain lithium niobate substrate having thereon a grating wherein the grating comprises single domain regions of lithium niobate having their plus c-axis direction substantially opposite the plus c-axis direction of the substrate.

Wave device having a reverse domain grating

This invention relates to a surface acoustic wave device which is comprised of a single domain lithium niobate layer on a multiple domain lithium niobate substrate. On the single domain layer are launching and receiving interdigitated electrode patterns. Spurious responses generated by bulk waves from the launching electrode and transmitted to the receiving electrode are substantially reduced.

Surface acoustic wave device with reduced spurious responses

An optical waveguide of niobium-doped lithium tantalate single crystal has excellent low loss waveguiding properties with strong electro-optic behavior. The waveguides are made by depositing a film of niobium on a polished lithium tantalate crystal, annealing the crystal so as to diffuse the niobium into the crystal and cooling the crystal.

Light modulation employing single crystal optical waveguides of

Single crystal electro-optic material useful for recording phase holograms comprises lithium niobate or lithium tantalate doped with iron and silicon.

Crystals for recording phase holograms

Method of making optical waveguides and product by the process

A single crystal of lithium tantalate is pretreated to diffuse lithium atoms into the crystal. Niobium is then diffused into the pretreated crystal to form an optical waveguide.

Method of preparing optical waveguides

Photochromic lithium niobate crystals containing iron and either manganese or copper are useful for recording phase holograms in the photosensitive state of the crystals, which holograms can be permanently fixed and read out without loss in the quality of the image obtained therefrom over extended periods.

Photochromic lithium niobate and method for preparing same

Lithium niobate single crystals doped with iron can be treated to reduce trivalent iron to divalent iron without reduction of the lithium niobate host crystal, by surrounding the crystal with a high-melting salt of lithium, such as lithium carbonate, and heating in an oxygen-containing atmosphere until the desired amount of reduction is obtained.

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Princeton, NJ, United States of America

William Phillips