System and method for growth of lithium niobate crystal with rough chemical ratio by melt injection process

An implantation method, lithium niobate technology, applied in the direction of crystal growth, single crystal growth, single crystal growth, etc., can solve the problems of difficult to grow large crystals, complicated equipment, high defect density, and achieve the advantages of industrial production and crystal composition. The effect of small fluctuation and high degree of automation

Inactive Publication Date: 2007-08-08
NANKAI UNIV
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Problems solved by technology

1. It is difficult to grasp the ratio of the eutectic point of the same ingredients; 2. Slow growth rate; 3. Poor uniformity of crystal composition; 4. It is difficult to grow large crystals; 5. High defect density; Double Crucible Technology 1. Can grow large crystals; 2. Good uniformity of crystal composition; 1. Complex equipment; 2. It is not easy to control the solid feeding; 3. Slow growth rate; Gas Equilibrium Method 1. Good composition uniformity; 1. It is difficult to prepare thick crystals;

Method used

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  • System and method for growth of lithium niobate crystal with rough chemical ratio by melt injection process
  • System and method for growth of lithium niobate crystal with rough chemical ratio by melt injection process

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Embodiment Construction

[0031] The specific embodiment of the present invention is described in detail below in conjunction with accompanying drawing:

[0032] As shown in Figure 1: This melt injection method grows near-chemical ratio lithium niobate crystal system, the system includes a crystal growth furnace, a feeding furnace, 2 thyristor controllers, 3 loop regulators, and an intermediate frequency power supply 31 , industrial control computer (32) and supporting software 7 parts:

[0033] The crystal growth furnace part includes a motor 1, which drives the lower screw 2 and the seed rod 3 to form a pulling system for crystal growth. The seed rod pulls the crystal 4 from the melt 5 in the crucible 23. Below the crucible is a thermocouple 8. It is in the insulation material 6 outside the crucible, and the periphery of the crucible is the induction coil 7 for heating, the induction coil 7 is connected to the intermediate frequency power supply, and the force sensor 9 is under the insulation materia...

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Abstract

This invention relates to a system and process for growth of lithium niobate crystal with proximate chemical ratio by molten injection. Because lithium niobate crystal is not co-melting of a common constituent, and the constituent of crystal solid is different from that of molten body, hardly is uniform crystal obtained. The system consists of a crystal growth furnace, a feeding furnace, a circulative regulator, a MF power supply, a controlling computer, and software. Balancing the rate of growth with the rate of feeding, it makes them equal and crystal growth in a constant constituent. Its advantages include well continuous feeding, little changes in crystal constituent rate, well uniform in optical characteristics, and high automatic production, simple apparatus, which is used to produce other co-molten crystals with non-common constituents.

Description

technical field [0001] The invention relates to the growth of near-chemical ratio lithium niobate crystals, in particular to a growth system and process thereof by a melt injection method, and belongs to the technical field of crystal growth. Background technique [0002] Since the lithium niobate crystal is not eutectic with the same composition, that is, the molten lithium niobate melt with the molar ratio Nb:Li=1, the crystallized solid composition is inconsistent with the melt composition, and its Nb:Li>1, so that the melt The composition of the crystal is constantly changing, and the composition of the crystalline solid is also constantly changing. Therefore, it is difficult to obtain lithium niobate crystals with uniform composition. The solid composition crystallized from the molten lithium niobate melt with a molar ratio of Nb:Li=51.2:46.8 is consistent with the melt composition, and it is relatively easy to obtain lithium niobate crystals with uniform compositio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B15/00C30B29/30
Inventor 孙军孔勇发张玲许京军阎文博黄自恒刘士国李兵陈绍林李剑韬
Owner NANKAI UNIV
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