Method for preparing large-size Ce,Nd: YAG crystal based on transverse translation crystallization method

A crystallization method and large-size technology, which is applied in crystal growth, chemical instruments and methods, single crystal growth, etc., can solve problems such as difficulty in preparing large-size crystals, increasing the temperature gradient of solid-liquid interface, and large residual stress of crystals. Achieve the effects of less deformation, improved crystal utilization, and small temperature gradient in the temperature field

Active Publication Date: 2020-08-11
CHINA ELECTRONICS TECH GRP NO 26 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the prior art, Ce, Nd:YAG crystals are generally grown by the pulling method, but the mechanical movement of rotation and pulling is required during the growth process, which will form forced convection in the melt and increase the temperature gradient near the solid-liquid interface , resulting in larger residual stress and higher dislocation density in the crystal
At the same time, growing Ce, Nd:YAG by the pulling method will produce an unusable core in the middle of the crystal, and easily produce side centers that are also unusable around it, reducing the crystal utilization rate and making it difficult to prepare large-sized crystals.

Method used

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  • Method for preparing large-size Ce,Nd: YAG crystal based on transverse translation crystallization method

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Effect test

specific Embodiment 1

[0057] Use 5N Al 2 o 3 Powder 791.97g, 5N Y 2 o 3 Yttrium oxide raw material 1004.94g, 5N CeO 2 Powder 7.82g, 5N Nd 2 o 3 The powder is 15.28g, and all kinds of raw materials are mixed evenly, pressed and sintered, then put into a boat-shaped tungsten crucible, and YAG seed crystal is placed at the tip of the tungsten crucible. Put the crucible containing the raw materials into the horizontal translational crystal growth furnace, place a heat shield around it, close the crystal furnace, turn on the circulating water, and evacuate to 1×10 -3 Pa, close the vacuum, fill in argon to make the pressure in the crystal furnace reach 1.7×10 5 Pa, stop argon filling, and start to heat up. When the temperature was raised to 1970°C, the powder was found to be melted, and a liquid flow line appeared near the seed crystal. Adjust the position of the crucible to melt the seed crystal slowly. After a period of time, start to move the crucible to keep the seed crystal away from the high...

specific Embodiment 2

[0059] 5N Al is selected according to a certain proportion 2 o 3 Powder 1256.63g, 5N Y 2 o 3 Raw material 1490.34g, 5N CeO 2 Powder 149.68g, 5N Nd 2 o 3 The powder is 123.37g, and the molar ratio of Y, Ce, and Nd ions in the raw material is 18:1:1. After mixing all kinds of raw materials evenly, they are pressed and sintered, and then put into a boat-shaped tungsten crucible, and the YAG seed crystal is placed on the tip of the tungsten crucible. Put the crucible containing the raw materials into the horizontal translational crystal growth furnace, place a heat shield around it, close the crystal furnace, turn on the circulating water, and evacuate to 8×10 -4 Pa, close the vacuum, fill in argon to make the pressure in the crystal furnace reach 1.9×10 5 Pa, stop argon filling, and start to heat up. Raise the temperature to 1900°C and found that the shape of the powder has changed but not completely melted. Continue to raise the temperature to 2000°C. It is found that th...

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Abstract

The invention discloses a method for preparing a large-size Ce,Nd: YAG crystal based on a transverse translation crystallization method. The method comprises the following nine specific technologicalprocedures: burdening, charging into a furnace, vacuumizing and inflating, heating, seeding, shouldering growth of crystals, equal-width growth of the crystals, cooling and in-situ annealing, and taking-out of the crystals. The transverse translation crystallization method is utilized in the invention, the advantages of a directional crystallization method and a vertical zone melting method are achieved at the same time, and the prepared Ce,Nd: YAG crystal has the advantages of low cost, short growth period, high crystal quality, good product uniformity, no core side center, high product utilization rate and the like.

Description

technical field [0001] The invention relates to the field of crystal preparation, in particular to a method for preparing large-sized Ce, Nd:YAG crystals based on a lateral translation crystallization method. Background technique [0002] Ce,Nd:YAG is a widely used double yttrium-doped aluminum garnet crystal material, which has good anti-ultraviolet radiation characteristics and good thermal stability, and has low threshold, high efficiency, high mechanical strength, and good thermal shock resistance. , is the most ideal working material for water-free and air-cooled lasers, and is widely used in small and medium-sized range finders and laser medical instruments. As a sensitizer, Ce ions can effectively transfer energy to Nd ions through two modes of radiation absorption transfer and non-radiation transfer, which significantly improves the energy utilization rate of the optical pump and the luminous efficiency of the crystal. [0003] In the prior art, Ce, Nd:YAG crystals ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B15/06C30B29/28
CPCC30B15/06C30B29/28
Inventor 顾跃毛世平丁雨憧
Owner CHINA ELECTRONICS TECH GRP NO 26 RES INST
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