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通常商业使用的同成分铌酸锂晶体(CLN)是固液同成分共熔点配比,其Li_2O含量约为48.6mol%,晶体中存在大量的锂空位和反位铌等本征缺陷,进而影响了晶体的电光系数、折射率、光折变等性能。研究表明,将缺锂的晶体在高温、富锂气氛下进行扩散处理可获得接近化学计量配比的铌酸锂晶体(nSLN),这种方法获得的nSLN晶体光学质量高,且技术简便、成本低,具有实际应用价值。本文分析了富锂气氛下CLN晶体扩散过程中反位铌的扩散机制和扩散路径,认为反位铌在扩散过程中将迁移到晶体外部,并通过CLN晶片的单边扩散进行了验证。
Common commercial use of the same composition of lithium niobate crystals (CLN) is the solid-liquid eutectic point with the ratio of components, the Li_2O content of about 48.6mol%, there are a large number of crystal lithium vacancies and anti-niobium and other intrinsic defects, thereby affecting The crystal’s electro-optic coefficient, refractive index, photorefractive properties. The results show that near-stoichiometric lithium niobate (nSLN) can be obtained by diffusion-treating lithium-deficient crystals under high temperature and lithium-rich atmosphere. The nSLN crystals obtained by this method have high optical quality, simple technique and high cost Low, with practical value. In this paper, the diffusion mechanism and diffusion path of anti-Niobium in the CLN crystal during lithium-rich atmosphere diffusion are analyzed. It is considered that the anti-Niobium will migrate to the outside of the crystal during the diffusion and be verified by the unilateral diffusion of the CLN wafer.