Process for oxidizing iron-doped lithium niobate

Details Process for oxidizing iron-doped lithium niobate Process for oxidizing iron-doped lithium niobate

1997-03-18

1999-05-11

Garrett, Felisa

Compositions

Light transmission modifying compositions

Inorganic crystalline solid

117 19, 117928, 430 1, G02B1/02

Patent

active

059025190

ABSTRACT:
A process for oxidizing iron ions contained within iron-doped lithium niobate. The process comprises the steps of protonating the iron-doped lithium niobate crystal and then placing the same into a pressure chamber where between 10-100 atmospheres of dry, ultra-pure pressurized oxygen are applied. While under pressure, the crystal is heated to approximately 950.degree. C. at a rate not to exceed 50.degree. C. per minute, and preferably at a rate not less than 25.degree. C. per minute. The crystals are then continuously heated at approximately 950.degree. C. for approximately 50 hours and then cooled to 30.degree. C. at a rate not to exceed 50.degree. C. per minute, and preferably at a rate not less than approximately 25.degree. C. per minute. The resulting lithium niobate crystal will thereafter contain iron ions wherein the divalent iron ion ration to the trivalent iron ion ratio is approximately 1:100.

REFERENCES:
patent: 3703328 (1972-11-01), Glass et al.
patent: 3799642 (1974-03-01), Phillips et al.
patent: 3932299 (1976-01-01), Phillips
patent: 4052119 (1977-10-01), Williams et al.

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