Vanadium doped lithium niobate crystal

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

Inactive Publication Date: 2011-12-28
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 99.9mol% [Li] / [Nb]=48.38 / 51.62 of the mixture of lithium carbonate and niobium pentoxide, mix the two fully on the mixer for 24 hours, and keep the temperature at 850℃ for 2 hours to make the lithium carbonate Fully decompose, and then calcined at 1100°C for 12 hours into vanadium-doped lithium niobate powder.

[0017] [2] The powder is charged into the furnace and grown according to the pulling method. The pulling direction is C-axis. It grows into a single crystal through the stages of neck pulling, shoulder setting, equal diameter, and finishing. After annealing, single domain and orientation At the stages of cutting, grinding and polishing, a vanadium-doped lithium niobate crystal with a doping amount of 0.1 mol% can be obtained.

[0018] [3] Test result: using the two-wave coupling method, the used wavelength is 351nm, response time: 6.0 seconds, diffraction efficiency 7%, refractive index change Δn=9.6×10 -6 , The sensitivity S=0.018cm / J. ...

Embodiment 2

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

[0021] [2] The powder is charged into the furnace and grown according to the pulling method. The pulling direction is C-axis. It grows into a single crystal through the stages of neck pulling, shoulder setting, equal diameter, and finishing. After annealing, single domain and orientation At the stages of cutting, grinding and polishing, it is possible to obtain a vanadium-doped lithium niobate crystal with a doping amount of 0.3 mol% for experiment.

[0022] [3] Test result: 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...

Embodiment 3

[0024] [1] Weigh 0.5mol% V 2 O 5 And 99.5 mol% [Li] / [Nb]=48.38 / 51.62 of the mixture of lithium carbonate and niobium pentoxide, mix the two thoroughly on the mixer for 24 hours, and keep the temperature at 850°C for 2 hours to make the lithium carbonate Fully decompose, and then calcined at 1100°C for 12 hours to become doped lithium niobate powder.

[0025] [2] The powder is charged into the furnace and grown according to the pulling method. The pulling direction is C-axis. It grows into a single crystal through the stages of neck pulling, shoulder setting, equal diameter, and finishing. After annealing, single domain and orientation At the stages of cutting, grinding and polishing, a vanadium-doped lithium niobate crystal with 0.5 mol% doping can be obtained.

[0026] [3] Test result: 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 , The 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 optoelectronic materials, and particularly relates to a nonlinear optical crystal and its photorefractive application. 【Background technique】 [0002] Lithium niobate crystal is a multi-functional and versatile optoelectronic material. It has the advantages of stable mechanical properties, easy processing, high temperature resistance, corrosion resistance, rich source of raw materials, low price, and easy growth into large crystals. One of the crystals with the best comprehensive indicators for variable applications. [0003] At present, the enhancement of the photorefractive performance of lithium niobate is mainly focused on two aspects: 1. Growing a stoichiometric lithium niobate crystal with fewer intrinsic defects (Li / Nb ratio is close to 1), but this kind of crystal is not easy to obtain Crystals with large diameter and uniform composition, and complex growth technology. Two: Doping photorefractive ele...

Claims

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Application Information

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Patent Type & Authority Applications(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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