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Vanadium-doped lithium niobate crystal

A technology of vanadium-doped lithium niobate and vanadium vanadium niobate, applied in crystal growth, single crystal growth, single crystal growth and other directions, can solve the problems of long response time, low anti-photorefractive threshold, strong light scattering, etc. Short response time, enhanced photorefractive properties, and small light absorption coefficient

Inactive Publication Date: 2014-03-05
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of long response time, strong light scattering and low photorefractive resistance threshold in existing doped lithium niobate crystals, and provide a vanadium-doped lithium niobate crystal and a preparation method thereof

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 【1】Weigh 0.1mol% V 2 o 5 And the mixture of lithium carbonate and niobium pentoxide of [Li] / [Nb]=48.38 / 51.62 of 99.9mol%, the two are fully mixed on the mixer for 24 hours, at 850 ℃ constant temperature for 2 hours, make lithium carbonate Fully decompose, and then calcined at 1100°C for 12 hours to form vanadium-doped lithium niobate powder.

[0017] [2] Put the powder into the furnace and grow it according to the pulling method. The C-axis in the pulling direction grows into a single crystal through the stages of necking, shouldering, equal diameter, and finishing. After the later annealing, monodomainization, and orientation , cutting, grinding and polishing, etc., can obtain vanadium-doped lithium niobate crystals with a doping amount of 0.1 mol% for experiments.

[0018] 【3】Test results: using the method of two-wave coupling, the wavelength used is 351nm, the response time is 6.0 seconds, the diffraction efficiency is 7%, and the refractive index change Δn=9.6×10 ...

Embodiment 2

[0020] 【1】Weigh 0.3mol% V 2 o 5 And the mixture of lithium carbonate and niobium pentoxide of [Li] / [Nb]=48.38 / 51.62 of 99.7mol%, the two are fully mixed on the mixer for 24 hours, at 850 ℃ constant temperature for 2 hours, make lithium carbonate Fully decompose, and then calcined at 1100°C for 12 hours to form doped lithium niobate powder.

[0021] [2] Put the powder into the furnace and grow it according to the pulling method. The C-axis in the pulling direction grows into a single crystal through the stages of necking, shouldering, equal diameter, and finishing. After the later annealing, monodomainization, and orientation , cutting, grinding and polishing, etc., can obtain vanadium-doped lithium niobate crystals with a doping amount of 0.3 mol% for experiments.

[0022] 【3】Test results: using the two-wave coupling method, the wavelength used is 351nm, the response time is 0.2 seconds, the diffraction efficiency is 22%, Δn=1.7×10 -5 , sensitivity S=0.97cm / J, the UV photor...

Embodiment 3

[0024] 【1】Weigh 0.5mol% V 2 o 5 And the mixture of lithium carbonate and niobium pentoxide of [Li] / [Nb]=48.38 / 51.62 of 99.5mol%, the two are fully mixed on the mixer for 24 hours, at 850 ℃ constant temperature 2 hours, make lithium carbonate Fully decompose, and then calcined at 1100°C for 12 hours to form doped lithium niobate powder.

[0025] [2] Put the powder into the furnace and grow it according to the pulling method. The C-axis in the pulling direction grows into a single crystal through the stages of necking, shouldering, equal diameter, and finishing. After the later annealing, monodomainization, and orientation , cutting, grinding and polishing, etc., can obtain vanadium-doped lithium niobate crystals with a doping amount of 0.5 mol% for experiments.

[0026] 【3】Test results: using the two-wave coupling method, the wavelength used is 351nm, the response time is 5.0, the diffraction efficiency is 18%, Δn=1.6×10 -5 , Sensitivity S=0.035cm / J.

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Abstract

The invention discloses a vanadium-doped lithium niobate crystal, which is grown by using a Czochralski crystal pulling method. The amount of the doped element vanadium is in the range of 0.1-5.0 mole percent. The crystal has superior photo-refraction performance under the condition of low doping amount; particularly the photo-refraction performance is greatly enhanced at the ultraviolet waveband of 351nm, for example, the response time is short, the diffraction efficiency is high, the optical coupling coefficient is high, and the like; the light absorption coefficient is low; the comprehensive performance is superior to that of other doped elements (such as Mg, Zn, In); in addition, since the doping amount is low, the growth of crystal with high optical quality is facilitated. The crystal has the photo-refraction resistance of over 104W / cm<2> after the doping amount reaches 2.0 mole percent; and the vanadium is doped for resisting photo-refraction. As a novel doping element for the lithium niobate crystal, the vanadium has superior photo-refraction performance and photo-refraction resistance performance, particularly prominent performance in the aspect of ultraviolet refraction; in addition, the doping amount is low, and the single crystal with high optical quality is easy to grow; and the crystal has broad application prospect.

Description

【Technical field】 [0001] The invention belongs to the technical field of photoelectric materials, and in particular relates to nonlinear optical crystals and applications of photorefractive changes. 【Background technique】 [0002] Lithium niobate crystal is a multifunctional and multipurpose photoelectric material, which has the advantages of stable mechanical properties, easy processing, high temperature resistance, corrosion resistance, abundant raw material sources, low price, and easy growth into large crystals. One of the crystals with the best comprehensive indicators in variable application. [0003] At present, the enhancement of the photorefractive properties of lithium niobate mainly focuses on two aspects: 1. Growth of lithium niobate crystals with a stoichiometric ratio with less intrinsic defects (Li / Nb ratio close to 1), but such crystals are not easy to obtain Large-diameter, uniformly composed crystals with complex growth techniques. Two: Doping photorefrac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/30C30B15/04
Inventor 刘士国董印锋孔勇发张玲陈绍林许京军
Owner NANKAI UNIV
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