[apparatus for growing stoichiometric lithium niobate and lithium tantalate single crystals and method of growing the same]
AssigneeNational Taiwan University
InventorChung-Wen Lan
Life of this patent
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Abstract
A method for growing stoichiometric lithium niobate and lithium tantalate single crystals is provided. A crystal growing apparatus that includes a long crucible with a separation member therein is used. A solid feed material is quenched from a molten state, solidified in batches or sintered before charged in the long crucible to obtain substantially stoichiometric solids. The separation member divides the long crucible into a melting zone and a feeding zone located under the melting zone, and it could effectively prevent bubble formation in the growing crystal. The stoichiometry of the axial and radial composition can be well controlled, and the control of the diameter of the crystal body is easily achieved as well.
Claims9
An apparatus for growing stoichiometric lithium niobate and lithium tantalate single crystals, the apparatus comprising:
- a chamber,
- a crystal pulling system,
- a long crucible arranged inside the chamber;
- a separation member arranged in the long crucible to divide an inner space of the long crucible into a melting zone and a feeding zone, wherein the melting zone is located above the feeding zone;
- a heating system surrounding a sidewall of the chamber;
- and
- a pushing/rotating system arranged under the long crucible to rotate and push the long crucible.
An apparatus for growing stoichiometric lithium niobate and lithium tantalate single crystals, the apparatus comprising:
- a chamber,
- a crystal pulling system arranged above the chamber,
- a long crucible arranged inside the chamber;
- a heating system surrounding sidewall of the chamber;
- and
- a pushing/rotating system arranged under the long crucible to rotate and push up the long crucible.
Dependencies are inferred from the claim text.