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Process for preparing chemical-specific Mg-doped lithium niobate crystal with periodic polarizing microstructure

A technology of periodic polarization and preparation process, which is applied in crystal growth, chemical instruments and methods, single crystal growth, etc., can solve the problems of magnesium-doped lithium niobate crystals with near-chemical ratio not being ideal, uneven, and affecting device performance, etc. Achieve the effects of large nonlinear coefficient, highly uniform composition and low coercive field

Inactive Publication Date: 2002-11-13
NANKAI UNIV
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Problems solved by technology

According to their reports, the ratio of [Li] / [Nb] in the crystal is very inhomogeneous, and there are a large number of growth stripes. The inhomogeneity of the crystal will directly affect the performance of the device, and the existence of a large number of growth stripes directly affects the performance of the material. Diffusion and precipitation of strength and impurities, and the existence of growth streaks often bring one or another problem and influence to the performance of the material
[0005] Therefore, this crystal (magnesium-doped growth method grows magnesium-doped near chemical ratio lithium niobate crystal) is not ideal enough.

Method used

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[0008] specific implementation

[0009] Concrete implementation steps of the present invention: (1) take by weighing the Li of metering composition metal element 2 CO 3 , Nb 2 o 5 And MgO, dry the powder at a constant temperature of 150°C for 2 hours, then fully mix it on a mixer for 24 hours, keep it at a constant temperature of 850°C for 2 hours to fully decompose, and calcinate at 1100°C for 2 hours to form magnesium-doped lithium niobate powder material. (2) Compact the powder, put it into a platinum crucible, heat it with an intermediate frequency furnace, and grow magnesium-doped lithium niobate crystals along the c-axis direction by the Czochralski pulling method according to the processes of pulling the neck, shouldering, equal diameter, and finishing. , the casting speed is 1-3mm, the rotating speed is 15-30rpm, the gas-liquid temperature difference is 20°C, the temperature gradient inside the melt is 1.5°C / mm, and the temperature gradient above the melt is 1°C / mm...

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Abstract

A Mg-doped lithium niobate crystal with periodically polarized microstructure is prepared frmo Mg-doped lithium niobate powder through growing crystal by Czochralsk method, gas-phase balanced diffusion and low-voltage polarizing at room temp. to make the crystal have periodic structure. It can be used to make optical device. Its advatages are high resistance to optical damage and high uniformity.

Description

technical field [0001] The invention relates to a process for preparing periodically polarized microstructure crystals of magnesium-doped chemical ratio lithium niobate, which belongs to the technical field of nonlinear optical crystal materials. Background technique [0002] As we all know, in the field of nonlinear optical technology, lithium niobate crystal is the nonlinear optical crystal with the best comprehensive performance index. Preferred material [1-2]. It should be said that the requirements of integrated optics for lithium niobate substrates are no less than those of integrated circuits for silicon wafers. It has a series of characteristics such as large nonlinear coefficient, wide light transmission range, simple preparation process and low cost. Nonlinear crystals that realize laser frequency doubling or laser parametric processes must not only meet the phase matching conditions, but also have as large a nonlinear optical coefficient as possible in this matc...

Claims

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Application Information

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IPC IPC(8): C30B15/02C30B29/30C30B31/06C30B33/02
Inventor 陈云琳许京军孔勇发张光寅
Owner NANKAI UNIV
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