A kind of ytterbium holmium dysprosium three-doped lead fluoride mid-infrared laser crystal and preparation method thereof

A technology of infrared lasers and laser crystals, applied in chemical instruments and methods, lasers, crystal growth, etc.

Active Publication Date: 2020-07-03
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are no reports of 2.7-3.1 micron ytterbium holmium dysprosium tridoped lead fluoride mid-infrared laser crystals at home and abroad

Method used

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  • A kind of ytterbium holmium dysprosium three-doped lead fluoride mid-infrared laser crystal and preparation method thereof
  • A kind of ytterbium holmium dysprosium three-doped lead fluoride mid-infrared laser crystal and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment one: Yb 0.01 Ho 0.01 Dy 0.01 Pb 0.97 f 2 Crystal Growth Preparation

[0023] PbF 2 (99.999%), YbF 3 (99.999%), HoF 3 (99.999%) and DyF 3 (99.999%) are fully mixed according to the molar ratio of the proportioning formula, put into a self-made crucible and sealed after fluorination treatment. Place the crucible in the high-temperature zone of the downhill furnace at a temperature of 980°C for 6 hours, and keep it warm for 4 hours to fully melt it. The growth atmosphere is N 2 gas, the crucible grows at a rate of 1.2-1.8mm / h, and the temperature gradient in the growth area is kept at 20-80°C / cm; h rate to cool slowly to room temperature.

Embodiment 2

[0024] Embodiment two: Yb 0.02 Ho 0.01 Dy 0.005 Pb 0.965 f 2 Crystal Growth Preparation

[0025] PbF 2 (99.999%), YbF 3 (99.999%), HoF 3 (99.999%) and DyF 3 (99.999%) are fully mixed according to the molar ratio of the proportioning formula, put into a self-made crucible and sealed after fluorination treatment. Place the crucible in the high-temperature zone of the downhill furnace at 1060°C for 8 hours, and keep it warm for 4 hours to fully melt it. The growth atmosphere is N 2 gas, the crucible grows at a rate of 1.4-1.6mm / h, and the temperature gradient in the growth area is kept at 20-60°C / cm; Slowly cooled to room temperature at rate h, the PbF obtained after the end of the growth 2 The laser crystal has good optical quality. Schematic diagram of the sensitization and deactivation mechanism of ytterbium holmium dysprosium tri-doped lead fluoride laser crystal figure 1 shown.

Embodiment 3

[0026] Embodiment three: Yb 0.02 Ho 0.02 Dy 0.01 Pb 0.95 f 2 Crystal Growth Preparation

[0027] PbF 2 (99.999%), YbF 3 (99.999%), HoF 3 (99.999%) and DyF 3 (99.999%) are fully mixed according to the molar ratio of the proportioning formula, put into a self-made crucible and sealed after fluorination treatment. Place the crucible in the high-temperature zone of the downhill furnace at a temperature of 1080°C for 8 hours, and keep it warm for 6 hours to fully melt it. The growth atmosphere is N 2 gas, the crucible grows at a rate of 1.5-1.8mm / h, and the temperature gradient in the growth area is kept at 20-50°C / cm; h rate to cool slowly to room temperature. After the growth is over, the crystal is taken out and directional cut, processed and polished, and the spectrum test is carried out. The fluorescence spectrum is as follows: figure 2 shown.

[0028] In summary, the present invention utilizes the Bridgman method to grow ytterbium (Yb 3+ ) Holmium (Ho 3+ ) Dys...

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Abstract

The invention discloses a novel medium-infrared laser crystal of a ytterbium, holmium and dysprosium-doped lead fluoride and a preparation method of the novel medium-infrared laser crystal. Holmium ions act as activating ions to realize a fluorescence output of 2.7 to 3.1 micrometers, and corresponding luminescence energy level transition is holmium: 5I6 to 5I7; ytterbium ions act as sensitizing ions to solve the problem of low absorption efficiency of the holmium ions at a commercial high-power LD pump; dysprosium ions have two effects; on one hand, the dysprosium ions shortens the life of the lower energy level (5I7) of the holmium ions, and the energy level life of the upper energy level (5I6) of the cesium ion does not change obviously, thus beneficially achieving the holmium: 5I6 to 5I7 population inversion and the mid-infrared laser output of the holmium ions; on the other hand, by energy transfer from holmium: 5I7 to dysprosium: 6H13 / 2, the number of particles on the upper energy level (6H13 / 2) of the dysprosium ions is increased, and dysprosium: 6H13 / 2 arrow 6H15 / 2 population inversion and mid-infrared laser output of the dysprosium ions are achieved.

Description

technical field [0001] The invention relates to the technical field of laser crystal gain materials, in particular to a novel mid-infrared laser crystal and a preparation method thereof. Background technique [0002] The mid-infrared 2.7-3.1 micron band is at the absorption peak of water molecules and harmful gas molecules. It can be widely used in medical engineering, air pollution monitoring, laser radar, scientific research and other fields. At the same time, it can achieve more The long-wavelength laser output has broad application prospects. In the current research work, the main dopant ions of 2.7-3.1 microns are concentrated in Er 3+ and Ho 3+ Between, such as doping Er 3+ YAP, YAG, LiYF 4 Laser crystals, etc., however Er-doped 3+ High-concentration doping is often required in the matrix of laser crystals, which makes it difficult to obtain laser crystals with high optical quality. By comparison, doped Ho 3+ The laser crystal can obtain a laser crystal with hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/12C30B11/00H01S3/16
CPCC30B11/00C30B29/12H01S3/1606H01S3/161H01S3/1618H01S3/1645
Inventor 张沛雄王宇皓陈振强朱思祁尹浩李真
Owner JINAN UNIVERSITY
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