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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, applied in chemical instruments and methods, crystal growth, single crystal growth, etc., can solve the problems affecting device performance, unsatisfactory and uneven lithium niobate crystals doped with magnesium near chemical ratio, etc. Achieve the effects of highly uniform composition, large nonlinear coefficient, and strong resistance to light damage

Inactive Publication Date: 2005-02-23
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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Embodiment

[0012] (1) Weigh the metering composition [Li 2 CO 3 ] / Nb 2 o 5 ]=0.94 and 2mol% 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 a blend Magnesium lithium niobate powder. (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 necking, shouldering, equal diameter, and finishing. The casting speed is 3mm / hour, the rotational speed is 27rpm, the temperature difference between gas and liquid is 20°C, the temperature gradient inside the melt is 1.5°C / mm, and the temperature gradient above the melt is 1°C / mn. (3) The grown crystal is monodomainized and annealed at 1200°C, and after orientation, cutting, polishing...

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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 a magnesium-doped chemical ratio lithium niobate periodic poled microstructure wafer, 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. 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 matching direction. H...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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