Photorefractive double-doped potassium sodium strontium barium niobate single crystal and preparation method thereof

A technology of barium strontium niobate and single crystal, which is applied in the field of optical materials, can solve problems such as the preparation of unseen polycrystals, and achieve the effects of improving the ability to resist light damage, reducing time and energy consumption, and improving the ability to resist light damage.

Inactive Publication Date: 2019-05-17
HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no report of chromium-gallium double-doping or nickel-gallium double-doping in patents or journal literature, and there is no preparation method combining polycrystalline preparation and pulling method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A photorefractive double-doped potassium sodium strontium barium niobate single crystal, wherein the molecular formula of potassium sodium strontium barium niobate is (KNa) 0.1 (Sr 0.65 Ba 0.35 ) 0.9 Nb 2 o 6 , doped with Cr and Ga oxides at the same time, taking the content of potassium, sodium, strontium and barium niobate as a reference, the doping content is: Cr 2 o 3 Content is 0.2mol%, Ga 2 o 3 The content is 1 mol%.

[0021] The preparation method of the above-mentioned photorefractive double-doped potassium sodium strontium barium niobate single crystal comprises the following steps:

[0022] (1) Weigh the raw materials containing corresponding metal elements according to the proportion, BaCO 3 , SrCO 3 、K 2 CO 3 、Na 2 CO 3 and Nb 2 o 5 , according to the molecular formula (KNa) 0.1 (Sr 0.65 Ba 0.35 ) 0.9 Nb 2 o 6 Weigh the ingredients; weigh Cr containing the blended content 2 o 3 , Ga 2 o 3 ; Prepare solid ammonium acetate by 12-18% of ...

Embodiment 2

[0028] The difference from Example 1 is that the content of doping Cr and Ga is: Cr 2 o 3 Content is 0.2mol%, Ga 2 o 3 The content is 1.8 mol%.

[0029] It was found through experiments that at 40mW / cm 2 The writing time constant measured under the total writing light intensity is between 23-31s, which is much smaller than the writing time constant of pure potassium sodium strontium barium niobate single crystal, and also smaller than that of single chromium-doped potassium sodium strontium barium niobate single crystal. The time constant is in the range of 43-65s; the light damage resistance and optical uniformity are also significantly better than pure potassium sodium strontium barium niobate single crystal.

Embodiment 3

[0031] The difference from Example 1 is that the content of doping Cr and Ga is: Cr 2 o 3 The content is O.5mol%, Ga 2 o 3 The content is 1 mol%. It was found through experiments that at 40mW / cm 2 The writing time constant measured under the total writing light intensity is between 17-24s, which is much smaller than the writing time constant of pure potassium sodium strontium barium niobate single crystal, and also smaller than that of single chromium-doped potassium sodium strontium barium niobate single crystal. The time constant is in the range of 43-65s; the light damage resistance and optical uniformity are also significantly better than pure potassium sodium strontium barium niobate single crystal.

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Abstract

The invention discloses a photo refraction double-doped potassium sodium strontium barium niobate single crystal. Two kinds of metal oxide are doped into (KNa)0.1(Sr0.65Ba0.35)0.9Nb2O6 crystals, one kind is Cr2O3 or Ni2O3, and the other kind is Cr2O3; when the metal oxide is a combination of Cr2O3 and Gr2O3, the content of Cr2O3 is 0.2-0.5 mol%%, and the content of Gr2O3 is 1-1.8 mol%; when the metal oxide is a combination of Ni2O3 and Gr2O3, the content of Ni2O3 is 0.1-0.4 mol%, and the content of Gr2O3 is 1-1.6 mol%. The product has the advantages of being high in sensitivity to weak light, high in optical damage resistance and high in record response speed in photo refraction application. The invention further discloses a preparation method of the photo refraction double-doped potassium sodium strontium barium niobate single crystal. The preparation method comprises the procedures of raw material preparation, ball milling, heating, stirring and reacting, temperature rise lifting and drawing, high temperature annealing, polarization and the like, and has the advantages of being simple in process step, good in finished product quality and low in energy consumption.

Description

technical field [0001] The invention relates to the field of optical materials, in particular to a photorefractive double-doped potassium sodium strontium barium niobate single crystal and a preparation method thereof. Background technique [0002] Photorefractive material is an excellent holographic optical storage material, and has been widely used in the field of holographic optical storage. Photorefractive materials store holograms or optical data through the photorefractive effect. The so-called photorefractive effect means that when a weak laser light from the outside shines on the photorefractive crystal, the carriers in the crystal are excited, and in the crystal Migration and re-entrapment in the crystal, resulting in a space charge field inside the crystal, and then through the electro-optic effect, the spatial distribution of the refractive index in the crystal is changed, thereby changing the process of the refractive index of the material. It is the "damage" an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/30C30B15/00
CPCC30B15/00C30B29/30
Inventor 石宏新任常愚田雪松王丰丁红伟金永君李娜尹向宝
Owner HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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