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Process for preparing barium tungstate single crystal with improved doping concentration of rare earth ion

A technology of doping concentration and rare earth ions, which is applied in the direction of single crystal growth, single crystal growth, crystal growth, etc., can solve the problems that laser crystals with practical value cannot be made and the doping concentration is low, and achieve enhanced luminescence performance and high Optical quality, efficiency-enhancing effects

Inactive Publication Date: 2008-06-18
BEIJING UNIV OF TECH
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Problems solved by technology

However, the doping concentration of rare earth ions in barium tungstate is very low [Lin Xinsong, Chen Jianzhong, Zhuang Naifeng, etc., Ytterbium-doped barium tungstate crystal and its spectral properties, Journal of Fuzhou University (Natural Science Edition), 2005, 33(3): 0366- 04], unable to make practical laser crystals

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  • Process for preparing barium tungstate single crystal with improved doping concentration of rare earth ion
  • Process for preparing barium tungstate single crystal with improved doping concentration of rare earth ion
  • Process for preparing barium tungstate single crystal with improved doping concentration of rare earth ion

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Embodiment Construction

[0017] 1. Adopt DJ400 single crystal furnace, medium frequency induction heating, platinum crucible for filling, Czochralski growth. BaCO with a molar ratio of 1:1 3 and WO 3 Mix 400g of powder to prepare barium tungstate BaWO with chemical reagent purity ≥ 4N (99.99%) 4 powder, adding percentage of 1mol% K 2 WO 4 and 2mol% Yb 2 o 3 , the powder is melted at 1495°C, the c-direction seed crystal is used to connect the crystal, and it is pulled at a rate of 0.5mm / h. After growing 1mm, it is pulled at a rate of 3mm / h, and the rotation speed is 18r.p.m.. 5 hours to room temperature. After annealing, the crystal was cut perpendicular to the c-axis, ground and polished as a test sample. The absorption spectra of the samples were tested by FTS6000 visible and near-infrared Fourier transform infrared spectrometer. See figure 1 . Yb 3+ : BaWO 4 In monodoped 2mol% Yb 2 o 3 When the maximum absorption coefficient is 0.01415cm -1 , in double-doped 1mol% K 2 WO 4 and 2mol%...

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Abstract

The invention discloses a barium tungstate single-crystal preparing technology to improve rare earth ion doping density in the single-crystal growing domain, which comprises the following steps: adding 1.0-5 molar percent rate K2WO4 powder and 0.1-10 molar percent rate rare earth oxide powder in the BaWO4 power over 99.99 percent purity; putting the mixture in the copple; heating to 1475-1495 deg.c in the furnace; putting seed in the flux from the top of copple; sashing; rotating to grow constant-diameter barium tungstate single-crystal. The invention improves the luminous property and output power of laser, which can produce large-size single crystal.

Description

technical field [0001] The invention discloses a barium tungstate single crystal preparation process for increasing the doping concentration of rare earth ions, belonging to the technical field of single crystal growth. Background technique [0002] Rare earth ions are an important part of laser crystals. As laser-activated ions, they determine the laser wavelength, energy conversion efficiency, pumping threshold energy, maximum output energy and power. The doping concentration of rare earth ions in laser crystal is one of the key factors to determine the energy conversion efficiency of laser crystal. Therefore, it is necessary to increase the concentration of activated ions in the host crystal as much as possible without causing concentration quenching. As another element of the two basic components of the laser crystal, the host crystal plays an indispensable role in providing a suitable crystal field for the activated ions, and its performance also has an important impac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/32C30B15/04
Inventor 臧竞存邹玉林李晓谢丽艳吕超
Owner BEIJING UNIV OF TECH
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