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Growth of LiB3O5 nonlinear optical crystal

A non-linear optics and growth method technology, applied in the field of crystal growth, can solve the problems of hindering crystal growth, narrowing the metastable region, and ineffective mixing degree, etc., to improve the growth rate and quality, increase the growth rate, and reduce the inclusions. Effect

Inactive Publication Date: 2006-05-03
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of low melt mixing degree, the flux ions discharged from the crystal growth cannot diffuse from the crystal to the melt in time, and the melt cannot diffuse from the melt to the crystal surface in time, which will cause Hinder the growth of crystals and cause starvation of crystals, produce wrapping, and even cause local overheating at the crystal boundary. For example, when we grow LBO crystals, there are peritectic and overheating phenomena, which obviously hinder the growth of crystals.
At the same time, due to the inhomogeneity of the melt, as the temperature decreases, local overcooling will occur on the bottom or wall of the crucible, which will cause multi-nuclear growth. Several small crystals, the largest size can reach 15mm×3mm×5mm, which will reduce the utilization rate of melt and hinder the growth of crystals
[0005] However, the current technology of mixing melts we generally use is the top rotation stirring seed crystal method and the natural convection method caused by temperature gradient, which has many limitations, such as (1) the seed crystal is only stirred in a limited area on the top of the melt, It only causes mixing in a limited area, and at the same time it accelerates the development of the top melt and narrows the metastable zone; (2) The degree of mixing caused by natural convection caused by temperature gradients is not effective enough and causes large temperature fluctuations

Method used

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  • Growth of LiB3O5 nonlinear optical crystal
  • Growth of LiB3O5 nonlinear optical crystal
  • Growth of LiB3O5 nonlinear optical crystal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1: Use Li 2 B 4 O 7 +B 2 O 3 +NaCl is used as the raw material, and the mass ratio of moles is 32:64:4. After weighing, grind and mix evenly with an agate mortar and put it into a platinum crucible of Φ70mm×70mm. Figure 1 It shows that the middle seed crystal cooling method is used, and the temperature is kept at 50°C higher than the growth temperature (growth temperature is 814°C) for 2 days, and then the temperature is slowly lowered at a temperature drop rate of 5°C / day. When the growth is completed, it is treated with water to separate The crystal is oriented with the obtained crystal, and the c-direction seed crystal is cut out. Then use the seed crystal method to further grow large crystals: when the raw material is melted, use the trial seed crystal method to measure the saturation temperature of the melt, and drop the seed crystal into the melt at about 30°C above the saturation temperature, and then reduce to saturation after half an hour Temperature, star...

Embodiment 2

[0013] Example 2: Use Li 2 B 4 O 7 +B 2 O 3 +NaCl as the raw material, the mass ratio of moles is 32:64:4. After weighing, use an agate mortar to grind and mix evenly and put it into a platinum crucible of Φ70mm×70mm. The experimental device is as follows Figure 1 It shows that the middle seed crystal cooling method is used, and the temperature is kept at 50°C higher than the growth temperature (growth temperature is 814°C) for 2 days, and then the temperature is slowly lowered at a temperature drop rate of 5°C / day. When the growth is completed, it is treated with water to separate The crystal is oriented with the obtained crystal, and the c-direction seed crystal is cut out. Then use the seed crystal method to further grow large crystals: when the raw material is melted, use the trial seed crystal method to measure the saturation temperature of the melt, and drop the seed crystal into the melt at about 30°C above the saturation temperature, and then reduce to saturation after ha...

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Abstract

The present invention describes the method of growing LiB by combining the rotating crucible and the molten salt method for pulling 3 o 5 Nonlinear Optical Crystals. LiB 3 o 5 It is a nonlinear optical crystal material with large frequency multiplication coefficient, low dispersion rate and high damage threshold. The rotating crucible method (ACRT) is a method that can effectively improve the mass-energy transport rate and inhibit the multinuclear growth. And the pulling method (CZ.) is a method for rapidly growing crystals. The crucible is periodically rotated in the positive and negative directions, the maximum speed is -100rpm to 100rpm, and the cycle is 1.5 to 5 minutes. The rotating crucible method is compared with the current method used to grow LiB 3 o 5 The combination of the molten salt extraction method of nonlinear optical crystals is expected to greatly improve the growth rate and quality of LBO crystals.

Description

Technical field [0001] The present invention relates to the technical field of crystal growth, and describes the growth of LiB by a combination of a rotating crucible and a molten salt method. 3 O 5 (LBO for short) Nonlinear optical crystal. Background technique [0002] LiB 3 O 5 The space group is Pna2 1 , The unit cell parameter is a=8.4473×10 -1 nm, b=7.3788×10 -1 nm, c=5.1395×10 -1 nm, is a polar crystal, the c axis is the polar axis, and each unit cell contains two molecules. It has a large frequency multiplication coefficient and low dispersion rate. In terms of phase matching characteristics, LBO has three advantages: (1) When the LBO crystal is in the double frequency experiment, if the fundamental frequency light propagates along a main plane (I type 0=90°, IIφ=90° type), the maximum allowable angle and the minimum dispersion angle can be obtained. Obviously, this is quite beneficial to improve the frequency multiplication conversion efficiency; (2) It has a "Phase matc...

Claims

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Application Information

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IPC IPC(8): C30B29/22C30B9/12C30B15/00
Inventor 涂朝阳吴柏昌李坚富朱昭捷
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI