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Method for growing gradient doped Yb: YAG single crystal

A gradient doping and single crystal technology, applied in the direction of crystal growth, single crystal growth, single crystal growth, etc., can solve the problems of affecting crystal quality, uneven heating, high local heating, etc., to avoid fluid vibration, avoid crystal defects, The effect of reducing cracking

Active Publication Date: 2021-10-01
CHINA ELECTRONICS TECH GRP NO 26 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] While retaining the advantages of general Yb:YAG, gradient doped Yb:YAG crystals have excellent thermal management performance when working in lasers, and can be used as laser weapon-level high-power LD pumped solid-state lasers to solve the current problem of Yb:YAG The pain point of uneven heating and high local heating
However, since Yb 3+ The segregation coefficient of ions in the YAG matrix is ​​close to 1. The commonly used pulling method needs to melt all the raw materials and then grow them. As a result, the grown Yb:YAG crystals are close to homogeneous doping, and it is impossible to produce gradient doped crystals. Yb:YAG crystal
For the current horizontal oriented crystallization method, the heaters are connected in series as a whole, and the power is consistent, and the seeding position is located at the edge of the heater, and the entire heater area is full of melt, and the melting zone is large, resulting in Yb 3+ The ion concentration tends to be uniform, and it is impossible to grow gradient-doped Yb:YAG crystals
At the same time, the movement of the crucible will affect the crystal quality

Method used

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  • Method for growing gradient doped Yb: YAG single crystal
  • Method for growing gradient doped Yb: YAG single crystal
  • Method for growing gradient doped Yb: YAG single crystal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Prepare 200g of 1%, 2%, 3%, 4%, 5%, 6%, 7%, and 8% Yb:YAG raw materials respectively, mix them separately, and then sinter at 1500°C for 1 hour. The raw materials are put into the boat-shaped molybdenum crucible (160*100*40mm) from front to back according to the concentration gradually increasing, and the pure YAG seed crystal is put into the crucible head. Put the crucible and raw materials into the split movable heater in the single crystal furnace. The connection between the seed crystal and the raw material is located in the middle of the heater. Seal the heater and start drawing a high vacuum.

[0045] Wait until the vacuum reaches 2*10 -3 At Pa, turn on the heating power supply, and the heater starts to heat up. The heater consists of five groups of heating units, the middle group of heating units heats up to 24kW, the adjacent two groups of heating units heat up to 22kW, and the outermost two groups of heating units heat up to 21kW. After 3 hours of heating, ...

Embodiment 2

[0048] Prepare 200g each of 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, and 5% Yb:YAG raw materials, mix them separately and sinter at 1500°C for 1 hour, and sinter the raw materials with different concentrations Put them into a boat-shaped molybdenum crucible (160*100*40mm) from front to back according to the concentration gradually increasing, and put pure YAG seed crystals into the crucible head. Put the crucible and raw materials into the split movable heater in the single crystal furnace. The connection between the seed crystal and the raw material is located in the middle of the heater. Seal the heater and start drawing a high vacuum.

[0049] Wait until the vacuum reaches 5*10 -3 At Pa, turn on the heating power supply, and the heater starts to heat up. The heater consists of five groups of heating units, the middle group of heating units heats up to 23.9kW, the adjacent two groups of heating units heat up to 21.8kW, and the outermost two groups of heating units heat up to 2...

Embodiment 3

[0052] Prepare 150g each of 2%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18%, and 20% Yb:YAG raw materials respectively, mix them separately and sinter at 1500°C for 1 hour, Put the sintered raw materials with different concentrations into the boat-shaped molybdenum crucible (180*90*35mm) from front to back according to the concentration gradually increasing, and put the pure YAG seed crystal into the crucible head. Put the crucible and raw materials into the split movable heater in the single crystal furnace. The connection between the seed crystal and the raw material is located in the middle of the heater. Seal the heater and start drawing a high vacuum.

[0053] Wait until the vacuum reaches 1*10 -3 At Pa, turn on the heating power supply, and the heater starts to heat up. The heater is composed of 9 groups of heating units. The target power of the heating units from the middle to both sides is 23.6kW, 23.2kW, 23.1kW, 23kW, and 23kW. When the temperature rises for 0.6 hours, it...

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Abstract

The invention discloses a method for growing gradient doped Yb: YAG single crystals, and the method comprises the following steps: preparing Yb: YAG blanks with different doping concentrations, sequentially putting the different blanks into a boat-shaped molybdenum crucible from front to back according to a high-to-low concentration sequence, putting a seed crystal into the head of the boat-shaped molybdenum crucible, and putting the boat-shaped molybdenum crucible into a movable split type heater in a crystal growth furnace. The heater is composed of a plurality of independent heating units, the heating power of the middle of the heater is the highest, and the position and the heating power of each heating unit can be controlled respectively. By utilizing the heater, the axial temperature gradient around the blank can be finely adjusted, a controllable narrow melting zone is formed, the crucible is fixed, and the heater is moved to enable the narrow melting zone to move as required, so crystal growth is realized. The Yb: YAG gradient doping with the segregation coefficient close to 1 is realized, the internal microstructure of the material meets the functional requirements, and the concentration gradient is controllable.

Description

technical field [0001] The invention relates to crystal growth technology, in particular to a method for growing a gradient doped Yb:YAG single crystal, which belongs to the technical field of crystal materials. Background technique [0002] In recent years, Yb:YAG, as the laser crystal material with the simplest energy level structure, has received extensive attention and research. Yb 3+ Ions have the advantages of low quantum defects (8.6%), long fluorescence lifetime, wide absorption spectrum, non-excited state absorption, and energy upconversion, while the YAG matrix provides excellent optical and thermal properties, making Yb:YAG crystals a high-power One of the ideal gain media for compact solid-state lasers. At present, the average output power of diode-pumped lasers using Yb:YAG has reached the kilowatt level. In addition to using traditional rod-shaped crystals, researchers have designed various structures based on slab-shaped and disc-shaped Yb:YAG crystals. It ...

Claims

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Application Information

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IPC IPC(8): C30B29/28C30B13/00C30B13/16C30B13/28C30B13/08H01S3/16
CPCC30B29/28C30B13/00C30B13/16C30B13/28C30B13/08H01S3/1618H01S3/1643
Inventor 顾跃丁雨憧
Owner CHINA ELECTRONICS TECH GRP NO 26 RES INST
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