Process for preparing lithium niobate wafer by fused mass diffusion method

Abstract

The invention relates to a process for increasing the concentration of lithium ions in lithium niobate which comprises, placing the lithium niobate wafers with the same constituents into crucible, covering the wafers with right amount of lithium ion crystal powder and potassium ion crystal powder so as to melt down the crystal powder, then keeping constant temperature of 1000-1200 deg. C for 1-200 hours, cooling down to room temperature, and removing the ionic crystal residues adhering to the wafers by means of liquid cleaning and polishing.

Description

technical field [0001] The invention relates to a lithium niobate wafer with the same composition as the diffusion treatment of lithium ions, in particular to a process for increasing the concentration of lithium ions in lithium niobate, so that the wafer becomes a near-chemical ratio lithium niobate wafer with high lithium concentration, Belongs to the technical field of photoelectric functional materials Background technique [0002] There are mainly three existing methods for increasing the lithium concentration in lithium niobate: double crucible technology, flux method and vapor phase transport equilibrium method (VTE). The first two methods are methods of directly growing near-chemical lithium niobate crystals, and it is difficult to strictly control the lithium content during the growth process. The third method obtains a high lithium concentration by processing the finished lithium niobate wafer with the same composition. crystals. However, VTE requires high temper...

AI Technical Summary

Problems solved by technology

The first two methods are methods of directly growing near-chemical lithium niobate crystals, and it is difficult to strictly control the lithium content during the growth process. The third method obtains a high lithium concentration by processing the finished lithium niobate wafer with the same composition. the crystal

However, VTE requires high temperature conditions, long diffusion time, and requires good sealing of the container to ensure a high lithium concentration in the steam.