Method of growing near chemical gauge ratio lithium niobate monocrystal using crucible lowering method

A near stoichiometric ratio and crucible descending method, applied in the field of near stoichiometric ratio lithium niobate single crystal preparation, can solve the problems of unstable quality, complicated equipment and high cost, achieve good repeatability and consistency, avoid Hypoxia, simple effect of growth equipment
CN1216185CInactive Publication Date: 2005-08-24SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
Publication Date
2005-08-24
Estimated Expiration
Not applicable · inactive patent

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Abstract

A process for growing the lithium niobate monocrystal with near stoichiometric ratio by crucible lowering method includes putting orientational seed crystal in crucible, proportionally mixing Li2CO3 with Nb2O5, die pressing, putting it in said crucible, closing its cover, heating to 1160-1200 deg.C in resistance furnace to smelt and holding the temp for 2-6 hr, lowering the crucible at 0.1-1 mm / hr of speed to grow crystal, and cooling. Its advantages are simple equipment, large size and low cost.
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Description

technical field

[0001] The present invention and lithium niobate (LiNbO 3 , referred to as LN) single crystal, relates to a method for preparing a near-stoichiometric lithium niobate single crystal, more specifically, a method for growing a near-stoichiometric lithium niobate single crystal material by a crucible descent method. Background technique

[0002] LN crystals are piezoelectric, ferroelectric and electro-optic crystals with a wide range of applications. At present, commercial crystals are obtained from LiNbO with the same composition ratio by the pulling method. 3 Although the crystal grown by this method has good optical quality and consistency, it is a typical non-stoichiometric crystal, because the [Li] / [Nb] in the crystal is about 48.6 / 51.4, severe Li deficiency, forming a large number of intrinsic defects in the crystal, which has many adverse effects on the performance of LN, limiting the application of this crystal. The near-stoichiometric LN crystal has...

Claims

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