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

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...

AI Technical Summary

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;

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