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Novel technology for growth of yttrium-aluminum garnet crystal and equipment thereof

A new technology of yttrium aluminum garnet, which is applied in the direction of single crystal growth, crystal growth, single crystal growth, etc., can solve the problems of large temperature gradient, limitation, and small crystal growth interface angle

Inactive Publication Date: 2009-07-15
吴晟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The traditional pulling method growth process grows Nd 3+ : There are several deficiencies in YAG crystals: 1. Because the segregation coefficient of neodymium ions in YAG is too small, only less than 0.2, as the crystal grows gradually, the concentration of neodymium ions in the crystal will become higher and higher, making the crystal The difference between the neodymium ions at the head and tail is also getting bigger and bigger
2. The pulling method growth process requires a large temperature gradient, and the crystal growth interface is conical with a small angle
More limited Nd that can be cut out 3+ : Dimensions of YAG crystal element
3. Due to the need to use the precious metal iridium (Ir) crucible, its cost is very high
Due to these deficiencies, it is difficult to grow large-size, high-quality Nd that is urgently needed by current high-power laser devices using the pulling method growth process. 3+ :YAG crystal

Method used

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  • Novel technology for growth of yttrium-aluminum garnet crystal and equipment thereof
  • Novel technology for growth of yttrium-aluminum garnet crystal and equipment thereof
  • Novel technology for growth of yttrium-aluminum garnet crystal and equipment thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Growth neodymium ion concentration is 0.2% by weight of Nd 3+ :YAG crystal:

[0035] Will, 3Kg, the purity is 99.999% (5N level) doped neodymium (Nd 3+ ) The chemical reagent powder of yttrium aluminum garnet is packaged in a latex bag, which contains neodymium (Nd 3+ ) is 1% by weight; after packaging, it is compacted in a hydrostatic press with a pressure of 300MPa; after taking out the compacted neodymium (Nd 3+ ) yttrium aluminum garnet was sintered in the air at 1300° C. for 8 hours, and put it into the required crucible as a prefabricated raw material.

[0036] 12Kg of neodymium (Nd) doped with a purity of 99.999% (5N grade) 3+ ) The chemical reagent powder of yttrium aluminum garnet is packaged in a latex bag, which contains neodymium (Nd 3+ ) with a weight ratio concentration of 0.2%; after packaging, it is compacted in a hydrostatic press with a pressure of 300MPa; after taking out the compacted neodymium (Nd 3+ ) yttrium aluminum garnet raw material was s...

Embodiment 2

[0039] Growth neodymium ion concentration is 1% by weight of Nd 3+ :YAG crystal:

[0040] 3Kg of neodymium (Nd) doped with a purity of 99.999% (5N grade) 3+ ) The chemical reagent powder of yttrium aluminum garnet is packaged in a latex bag, which contains neodymium (Nd 3+ ) is 5% by weight; after packaging, it is compacted in a hydrostatic press with a pressure of 200MPa; after taking out the compacted neodymium (Nd 3+ ) yttrium aluminum garnet raw material was sintered in the air at 1300° C. for 8 hours, and put it into the required crucible as prefabricated raw material.

[0041] 12Kg of neodymium (Nd) doped with a purity of 99.999% (5N grade) 3+ ) The chemical reagent powder of yttrium aluminum garnet is packaged in a latex bag, which contains neodymium (Nd 3+ ) concentration by weight is 1%; after encapsulation, it is compacted under a pressure of 300MPa in a hydrostatic press; the neodymium-doped (Nd 3+ ) yttrium aluminum garnet was sintered in air at 1300° C. for 8...

Embodiment 3

[0044] Growth neodymium ion concentration is 1.5% by weight of Nd 3+ :YAG crystal:

[0045] 3Kg of neodymium (Nd) doped with a purity of 99.999% (5N grade) 3+ ) The chemical reagent powder of yttrium aluminum garnet is packaged in a latex bag, which contains neodymium (Nd 3+ ) is 7.5% by weight; after packaging, it is compacted in a hydrostatic press with a pressure of 200MPa; after taking out the compacted neodymium (Nd 3+ ) yttrium aluminum garnet raw material was sintered in the air at 1300° C. for 8 hours, and put it into the required crucible as prefabricated raw material. Accurately weigh 12Kg of neodymium (Nd) with a purity of 99.999% (5N grade) 3+ ) chemical reagent powder of yttrium aluminum garnet, which contains neodymium (Nd 3+ ) is 1.5% by weight. Sinter at 1300°C for 8 hours, and put it into the hopper of the feeding system as a supplementary material. Use a YAG crystal rod with a crystal orientation of (111), a diameter of 5mm, and a length of 50mm as the ...

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Abstract

The invention discloses a new technique for growing yttrium aluminium garnet (YAG) crystals and a device thereof. The technique uses an intermediate frequency induction heating Bridgman-Stockbarge crystal growth method, and employs a new technique for synchronously and continuously feeding a high-temperature melt with gradual crystal growth in the growth procedure. The new technique perfectly solves the problems that a large crucible is used for growing small crystals as the concentration distribution of doped ions in grown crystals is uneven caused by small segregation coefficient of the doped ions when YAG high-temperature melt is crystallized and Nd:YAG is grown by a pulling method. The provided technique can help grow doped YAG crystals with large size, higher crystal bar cutting utilization rate, even concentration distribution of doped ions and good optical homogeneity. The technique satisfies the constant new requirements of the solid laser technical field for the YAG crystals.

Description

technical field [0001] The invention relates to the field of crystal research, in particular to a new technology and equipment for growing yttrium aluminum garnet crystals. Background technique [0002] Incorporation of appropriate rare earth element ions such as Nd 3+ , Yb 3+ , Er 3+ , Pr 4+ or Cr 4+ The yttrium aluminum garnet (YAG for short) single crystal has excellent laser physical properties, and it is widely used in the field of solid-state laser technology, such as laser range finder, laser radar, various laser medical equipment, laser marking Machines, laser cutting machines, laser welding machines and other equipment. Among them, especially neodymium-doped yttrium aluminum garnet (Nd 3+ :YAG) crystals are the most widely used and common. [0003] Currently, Nd 3+ :YAG crystal is mainly grown by Czochralski technique. Usually medium-frequency induction heating is used for growth in an iridium (Ir) crucible, and the growth cycle is about 20-30 days. But wi...

Claims

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Application Information

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IPC IPC(8): C30B29/28C30B11/00
Inventor 吴晟
Owner 吴晟
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