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Preparation method for holmium-doped yttrium barium fluoride crystals

A technology of holmium-doped yttrium-barium fluoride and yttrium-barium fluoride is applied in the field of preparation of holmium-doped yttrium-barium fluoride crystal, which can solve the problems such as difficulty in growth of holmium-doped yttrium-barium fluoride crystal, and achieve huge scientific research potential and application prospect, The effect of low phonon energy and simple equipment

Active Publication Date: 2016-04-06
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the problem that the existing holmium-doped yttrium-barium fluoride crystal is difficult to grow, and provides a preparation method of holmium-doped yttrium-barium fluoride crystal

Method used

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  • Preparation method for holmium-doped yttrium barium fluoride crystals
  • Preparation method for holmium-doped yttrium barium fluoride crystals
  • Preparation method for holmium-doped yttrium barium fluoride crystals

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specific Embodiment approach 1

[0015] Specific embodiment one: the preparation method of a kind of holmium-doped yttrium barium fluoride crystal of the present embodiment is carried out according to the following steps:

[0016] 1. Preparation of raw materials for crystal growth: Mix yttrium fluoride, barium fluoride and holmium fluoride evenly, place them in a vacuum drying furnace, and dry them at a temperature of 150-250°C for 11h-13h to obtain dried The mixed material after drying is put into the graphite crucible, then the graphite crucible is placed in the crucible falling crystal growth furnace, and the crucible is evacuated in the falling crystal growth furnace to a vacuum degree of 10 -2 Pa, then raise the furnace temperature to a temperature of 900-1000°C, keep it warm for 9h-11h, continue to raise it by 20°C and keep it warm until the raw material is completely melted, then lower the crucible at a speed of 5mm / h to a height of 100mm, then lower the crucible Naturally cool to room temperature afte...

specific Embodiment approach 2

[0022] Embodiment 2: This embodiment differs from Embodiment 1 in that the mole percentage of holmium fluoride described in step 1 is 3% of the dried mixture. Other steps and parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0023] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: In step 1, the drying is carried out at a temperature of 200° C. for 12 hours. Other steps and parameters are the same as those in Embodiment 1 or 2.

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Abstract

The invention belongs to the field of crystal growth, particularly relates to a preparation method for holmium-doped yttrium barium fluoride crystals, and aims at solving the problem that existing holmium-doped yttrium barium fluoride crystals are difficult to grow. The preparation method comprises the steps of 1 crystal growth raw material preparing; 2 crystal growing; 3 annealing; 4 postprocessing. According to the preparation method for the holmium-doped yttrium barium fluoride crystals, the holmium-doped yttrium barium fluoride crystals are prepared by adopting the mode of combining a slow cooling method with a Bridgman-Stockbarger method, therefore, the problem that in the crystal growing process, the crystals are cracked due to the fact that the temperature gradient is too large can be effectively avoided, and the large-size and high-quality complete crystals can be obtained; in addition, seed crystals are not needed, the equipment is simple, the whole growing process is performed under the high-vacuum condition, and the problems that the crystals are difficult to grow and bubbles are wrapped in the crystals due to the fact that the flowing property of yttrium barium fluoride melt is poor are solved.

Description

technical field [0001] The invention belongs to the field of crystal growth, in particular to a method for preparing a holmium-doped yttrium barium fluoride crystal. Background technique [0002] Holmium-doped barium yttrium fluoride (Ho:BYF), as a new type of laser crystal material in the infrared band, can achieve 2 μm near-infrared laser output, and can be used in the jamming system of military aircraft. The land, sea and air forces of the United States, Britain and other countries have developed a countermeasure system for infrared guided missiles (ATIRCM), which is successfully equipped on vehicles, ships and airborne; it can also be used in the environment10 -9 Detection of harmful gases such as formaldehyde and carbon monoxide in a large amount; in the medical field, precise resection of biological tissues can be performed without damaging surrounding tissues, and the amount of anesthetics can be reduced at the same time. [0003] At present, there are still many pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/12C30B11/00C30B33/02
CPCC30B11/00C30B29/12C30B33/02
Inventor 赵丽丽朱逢锐徐超
Owner HARBIN INST OF TECH
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