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Double-doped lithium niobate crystsal and method for making same

A technology of lithium niobate and crystal, which is applied in the field of double-doped lithium niobate crystal and its preparation, which can solve the problems of shortening response time, failure to improve dual-color storage performance, and long photochromic change response time, and achieve high sensitivity effect

Inactive Publication Date: 2009-05-13
HEBEI UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The doping of an impurity in magnesium, indium, or zinc in this patent can improve the monochromatic storage performance of iron-doped lithium niobate crystals, such as improving its anti-light scattering ability, reducing the light scattering threshold, and shortening the response time, but it cannot improve The two-color storage performance of the material, such as shortening the photochromic response time and improving the sensitivity of the two-color storage; unlike the two-color storage technology, the information stored in the single color has obvious volatility, which seriously restricts the use of lithium niobate crystals for holographic storage. Practical progress
[0005] The above literature reports show that the existing double-doped lithium niobate crystal materials have long photochromic response time and low non-volatile storage sensitivity, which is not conducive to practical application.

Method used

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  • Double-doped lithium niobate crystsal and method for making same
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  • Double-doped lithium niobate crystsal and method for making same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Weigh Li with a purity of 99.99% 2 CO 3 , Nb 2 o 5 , Fe 2 o 3 , and Co 2 o 3 , according to the molar ratio of 9.3800mol: 10.0000mol: 0.0030mol: 0.0015mol, after drying at 150°C to remove moisture, fully mix in a ball mill for 24 hours, then keep the temperature at 800°C for 4 hours, and finally at 1000°C Calcined for 10 hours to obtain iron-cobalt double-doped lithium niobate polycrystalline purified powder;

[0027] (2) The iron-cobalt double-doped lithium niobate polycrystalline purified powder obtained in step (1) is compacted and placed in a platinum crucible, and the powder is heated by the medium-frequency induction crucible method until it melts, and the Czochralski pulling method is used along the c In the axial direction, seeding, necking, shouldering, equal diameter, and finishing processes are sequentially performed to obtain iron-cobalt double-doped lithium niobate crystals. During the crystal pulling process, the pulling speed is 2mm / h, the rot...

Embodiment 2

[0034] (1) Weigh Li with a purity of 99.99% 2 CO 3 , Nb 2 o 5 , Fe 2 o 3 , and Co 2 o 3 , according to the molar ratio of 9.3800mol: 10.0000mol: 0.0015mol: 0.0015mol, after drying at 170°C to remove moisture, fully mix in a ball mill for 36 hours, then keep the temperature at 850°C for 3 hours, and finally at 1050°C Calcined for 6 hours to obtain iron-cobalt double-doped lithium niobate polycrystalline purified powder;

[0035] (2) The iron-cobalt double-doped lithium niobate polycrystalline purified powder obtained in step (1) is compacted and placed in a platinum crucible, and the powder is heated by the medium-frequency induction crucible method until it melts, and the Czochralski pulling method is used along the c In the axial direction, seeding, necking, shouldering, equal diameter, and finishing processes are carried out in sequence to obtain iron-cobalt double-doped lithium niobate crystals. During the crystal pulling process, the pulling speed is 1mm / h, the rota...

Embodiment 3

[0039] (1) Weigh Li with a purity of 99.99% 2 CO 3 , Nb 2 o 5 , Fe 2 o 3 , and Co 2 o 3 , according to the molar ratio of 9.3800mol: 10.0000mol: 0.0050mol: 0.0015mol, dry at 200°C to remove moisture, mix thoroughly in a ball mill for 48 hours, then keep the temperature at 900°C for 2 hours, and finally calcined at 1100°C In 2 hours, the iron-cobalt double-doped lithium niobate polycrystalline purified powder was obtained;

[0040] (2) The iron-cobalt double-doped lithium niobate polycrystalline purified powder obtained in step (1) is compacted and placed in a platinum crucible, and the powder is heated by the medium-frequency induction crucible method until it melts, and the Czochralski pulling method is used along the c In the axial direction, seeding, necking, shouldering, equal diameter, and finishing processes are carried out in sequence to obtain iron-cobalt double-doped lithium niobate crystals. During the crystal pulling process, the pulling speed is 3mm / h, the r...

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Abstract

The invention discloses a double blended lithium niobate crystal and preparing method in single crystal growth domain, which comprises the following steps: (1) setting component of the crystal as LiaNbbO3:FecCod; setting a as 0. 93800; setting b as 1. 00000; setting c as 0. 00005-0. 00075; setting d as 0. 00005-0. 00050; batching; mixing; calcining; (2) melting; lifting and pulling crystal; (3) proceeding single design; annealing; cutting film; buffing. This invention possesses higher non-volatile storing sensibility, which can be used to canned data, integrated optics and finance aspects.

Description

technical field [0001] The technical solution of the invention relates to the field of single crystal growth characterized by materials, specifically a double-doped lithium niobate crystal and a preparation method thereof. Background technique [0002] Lithium niobate crystals can be used in the field of non-volatile holographic storage. In pure lithium niobate crystals, the use of small polarons for non-volatile holographic storage requires relatively high storage light intensity, and it is difficult to obtain high storage sensitivity. Literature (H.Hatano, T.Yamaji, K.Kitamura, S.Takekawa, and M.Nakamura, "Holographic recording medium and holographic recording / reproducing apparatus using the same", U.S.PatentNo.6,856,433) introduction, the use of manganese-doped near stoichiometric Compared with lithium niobate crystals, higher sensitivity can be obtained, but the required ultraviolet light intensity is also very high, which is not suitable for practical applications. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/30C30B15/04C30B15/08
Inventor 阎文博李养贤师丽红孔勇发
Owner HEBEI UNIV OF TECH
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