| 摘要 |
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 DEG C. at a rate not to exceed 50 DEG C. per minute, and preferably at a rate not less than 25 DEG C. per minute. The crystals are then continuously heated at approximately 950 DEG C. for approximately 50 hours and then cooled to 30 DEG C. at a rate not to exceed 50 DEG C. per minute, and preferably at a rate not less than approximately 25 DEG 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.
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