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Molten-salt growth method for eliminating core package of low-temperature phase barium metaborate crystalloid

A phase barium metaborate, crystal growth technology, applied in crystal growth, single crystal growth, single crystal growth, etc., can solve the problem of low transport efficiency

Active Publication Date: 2013-05-22
FUJIAN CASTECH CRYSTALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the introduction of the boundary layer concept, the crystal to the melt can be divided into three parts, namely the crystal, the boundary layer, and the melt. In the melt, the transport of solute (especially impurities) mainly depends on convection. The efficiency is very high; while in the boundary layer, the solute transport mainly depends on diffusion, and the transport efficiency is much lower

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Crystal growth steps:

[0031] 1) Put the pre-weighed BaCO 3 、H 3 BO 3 Mix and grind NaF in an agate bowl according to the predetermined ratio, mix well and put it into a platinum material crucible;

[0032] 2) Put the chemical platinum crucible into the muffle furnace, raise the temperature to 1000°C for a full reaction for 2 hours; then clamp the crucible out with crucible pliers, and pour the melt into a platinum growth crucible with a diameter of 100mm , until the raw material fills more than 90% of the growth crucible;

[0033] 3) Put the growth crucible into the crystal growth furnace, raise the temperature slowly to completely melt the raw materials, then continue to heat up, and keep the temperature at a temperature 30°C higher than the melting point for 24 hours to homogenize the melt; then slowly lower the temperature to an estimated growth temperature;

[0034]4) Fix the small piece of β-BBO crystal on the crystal rod and slowly lower it to the liquid le...

Embodiment 2

[0043] Crystal growth steps:

[0044] 1) Put the pre-weighed BaCO 3 、H 3 BO 3 Mix and grind NaCl in an agate bowl according to the predetermined ratio, mix well and put it into a platinum material crucible;

[0045] 2) Other steps are consistent with 2) to 11) in Example 1.

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Abstract

The invention relates to a molten-salt growth method for eliminating the core package of a low-temperature phase barium metaborate crystalloid. The method comprises the following steps of: enabling the crystalloid to make vibration with the low frequency and the low amplitude in a direction vertical to seed crystals during the crystalloid growth process; decreasing the thickness of a diffusion layer at an interface between the crystalloid and a molten body; improving the transporting ability of solutes at the bottom after the extending of the seed crystals; and finally eliminating the package (the bottom of the seed crystals) at the center of the crystalloid, thereby preparing the coreless crystalloid.

Description

technical field [0001] The invention relates to the field of artificial crystal growth, in particular to a molten salt growth method for eliminating the core wrapping of low-temperature phase barium metaborate crystals. Background technique [0002] Nonlinear optical crystal (nonlinear optical crystal) is an important class of functional crystals, which can be used to make components such as frequency doubling, frequency mixing, electro-optical modulation, optical parametric oscillation and optical waveguide, and has formed a large-scale industry in the world market. Among the many nonlinear optical crystals, there are not many crystals that have been commercialized. There are three main types, namely β-BBO (low temperature phase barium metaborate), LBO (lithium triborate) and KTP (potassium titanyl phosphate). [0003] β-BBO crystal is a non-linear optical crystal that is widely used and known as "China Brand", it has a large effective frequency multiplication coefficient ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B15/00C30B29/22
Inventor 吴少凡陈伟
Owner FUJIAN CASTECH CRYSTALS
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