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Tin-doped lithium niobate crystal

A technology of lithium tin niobate and lithium niobate, which is applied in the field of nonlinear optical crystals, can solve the problems of high doping threshold concentration, difficulty in growing crystals with high optical quality, and effective segregation coefficient not equal to 1. Low doping threshold, significant production practice significance, and strong photorefractive resistance

Inactive Publication Date: 2012-01-25
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, magnesium-doped lithium niobate crystals have obvious shortcomings in some aspects, specifically: high doping threshold concentration, effective segregation coefficient not equal to 1, and it is difficult to grow crystals with high optical quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] (1) Weigh 0.1mol% tin dioxide SnO 2 and lithium carbonate and niobium pentoxide in a ratio of 1.41:1 (ie [Li 2 CO 3 ] / [Nb 2 o 5 ]=1.41) material. Dry the powder at a constant temperature of 150°C for 2 hours, then fully mix it on a mixer for 24 hours, and keep the temperature at 850°C for 2 hours to make Li 2 CO 3 Fully decompose and calcined at 1100°C for 12 hours to form double-doped lithium niobate powder. (2) Compact the powder, put it in a platinum crucible, heat it with an intermediate frequency furnace, and use the Czochralski (Czochralski) pulling method to grow along the c-axis direction according to the process of necking, shouldering, equal diameter, and finishing. Single-doped lithium niobate crystal, pulling speed 0.4mm / h (millimeter / hour), rotation speed 18rpm (rev / min), gas-liquid temperature difference 30°C, temperature gradient in the melt 1.5°C / mm (degree / mm), melt The upper temperature gradient is 1.0°C / mm. (3) The grown crystal is monodomaini...

Embodiment 2

[0016] (1) Weigh 0.5mol% tin dioxide SnO 2 and lithium carbonate and niobium pentoxide in a ratio of 1.40:1 (ie [Li 2 CO 3 ] / [Nb 2 o 5 ]=1.40) material. Dry the powder at a constant temperature of 150°C for 2 hours, then fully mix it on a mixer for 24 hours, and keep the temperature at 850°C for 2 hours to make Li 2 CO 3 Fully decompose and calcined at 1100°C for 12 hours to form double-doped lithium niobate powder. (2) Compact the powder, put it in a platinum crucible, heat it with an intermediate frequency furnace, and use the Czochralski (Czochralski) pulling method to grow along the c-axis direction according to the process of necking, shouldering, equal diameter, and finishing. Single-doped lithium niobate crystal, casting speed 0.4mm / h, rotation speed 18rpm, gas-liquid temperature difference 30°C, temperature gradient inside the melt 1.5°C / mm, temperature gradient above the melt 1.0°C / mm. (3) The grown crystal is monodomainized and annealed at 1150° C., and after ...

Embodiment 3

[0018] (1) Weigh 1mol% tin dioxide SnO 2 and lithium carbonate and niobium pentoxide in a ratio of 0.94:1 (ie [Li 2 CO 3 ] / [Nb 2 o 5 ]=0.94) material. Dry the powder at a constant temperature of 150°C for 2 hours, then fully mix it on a mixer for 24 hours, and keep the temperature at 850°C for 2 hours to make Li 2 CO 3 Fully decompose and calcined at 1200°C for 12 hours to form double-doped lithium niobate powder. (2) Compact the powder, put it in a platinum crucible, heat it with an intermediate frequency furnace, and use the Czochralski (Czochralski) pulling method to grow along the c-axis direction according to the process of necking, shouldering, equal diameter, and finishing. Single-doped lithium niobate crystal, casting speed 1mm / h, rotation speed 14rpm, gas-liquid temperature difference 30°C, temperature gradient inside the melt 1.5°C / mm, temperature gradient above the melt 1.0°C / mm. (3) The grown crystal is monodomainized and annealed at 1200°C, and after orient...

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Abstract

The present invention discloses a magnesium-doped lithium niobate crystal. The lithium niobate crystal is doped with magnesium ions Sn<4+>. The incorporation amount of magnesium ions Sn<4+> is 0.1-6.0mol% (mol percentage). Furthermore the lithium niobate crystal contains lithium ion Li<1+> and niobium ion Nb<3+> with a ratio of (0.93-1.41): 1. The magnesium-doped lithium niobate crystal has the advantages of low doping threshold, stronger photorefraction resistance, easy growing, etc. The photorefraction resistance of magnesium-doped lithium niobate crystal according to the invention is increased for four magnitudes compared with the lithium niobate crystal with the same component, and is increased for one magnitude compared with the magnesium-doped lithium niobate crystal with the same component. Therefore the magnesium-doped lithium niobate crystal is taken as an optical material which has the advantages of low doping threshold, strong photorefraction resistance and easy growing, and can totally replace the application of high magnesium-doped lithium niobate crystal. The tin-doped lithium niobate crystal has huge market prospect and significant production meaning.

Description

technical field [0001] The invention relates to the technical field of nonlinear optical crystals, in particular to a tin-doped lithium niobate crystal. Background technique [0002] Lithium niobate (LiNbO 3 ) crystal is a multifunctional and multipurpose optoelectronic material. An important characteristic of lithium niobate crystals is photorefraction. On the one hand, it opens up the application of crystals in holographic storage, optical amplification, etc., but at the same time, it also limits its applications in frequency conversion, Q switching, parametric oscillation, and optical waveguides. Applications. [0003] At present, doping some impurity ions in lithium niobate crystals is an effective means to improve the photorefractive resistance of lithium niobate crystals. The doped ions include: magnesium ions Mg 2+ , Zinc ion Zn 2+ , scandium ion Sc 3+ , indium ion In 3+ , hafnium ion Hf 4+ Among them, the most widely used is the doping of Mg in the lithium nio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/30C30B15/04
Inventor 刘士国孔勇发王利忠许京军陈绍林黄自恒张玲
Owner NANKAI UNIV
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