A 2.7-3 micron band mid-infrared ytterbium erbium dysprosium tri-doped lead fluoride laser crystal and its preparation method

A technology of laser crystals and lead fluoride, applied in chemical instruments and methods, lasers, crystal growth, etc., to achieve the effect of improving pump absorption efficiency

Active Publication Date: 2020-09-04
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no mid-infrared ytterbium, erbium, dysprosium, and three-doped PbF in the 2.7-3 micron band at home and abroad. 2 Related reports on laser crystals

Method used

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  • A 2.7-3 micron band mid-infrared ytterbium erbium dysprosium tri-doped lead fluoride laser crystal and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Grow PbF using the Bridgeman method 2 Crystal, raw material is PbF 2 (99.99%), YbF 3 (99.99%), ErF 3 (99.99%) and DyF 3 (99.99%), where Yb 3+ The doping concentration is 1at.%, Er 3+ The doping concentration is 1at.%, Dy 3+ The doping concentration is 0.5at.%. Before crystal growth, the raw materials are homogenized in a platinum crucible in the high temperature zone of 950-1050℃ for 8 hours, and kept for 4-6 hours to fully melt the raw materials; during the crystal growth period, the crucible is lowered into the crystal growth at a rate of 1-2mm / h After the crystal growth is finished, in the cooling process, in order to prevent the crystal from cracking, the temperature is slowly reduced to room temperature at a cooling rate of 20-40°C / h. The entire crystal growth process is carried out in a closed state, and the grown PbF 2 The crystal is transparent and the optical performance is good. Under the excitation of 970nm LD, the 2.7-3 micron mid-infrared fluorescence emissi...

Embodiment 2

[0023] In this embodiment, the raw material PbF with a purity greater than 99.99% is selected 2 , YbF 3 , ErF 3 And DyF 3 , Using Bridgeman method for crystal growth, successfully grown Ytterbium, Erbium, Dysprosium triple-doped PbF 2 Mid-infrared laser crystal, Yb 3+ The doping concentration of ions is 5at.%, Er 3+ The doping concentration is 10at.%, Dy 3+ The doping concentration is 3at.%. Before crystal growth, the raw material is homogenized in a platinum crucible in the high temperature zone of 1000-1100℃ for 10 hours, and the temperature is kept for 3-5 hours to fully melt the raw material; during the crystal growth period, the crucible is lowered into the crystal at a rate of 1.5-2.5mm / h Crystals are carried out in the growth zone; after the crystal growth, in the cooling process, in order to prevent the crystal from cracking, the temperature is slowly reduced to room temperature at a cooling rate of 40-60°C / h. The entire crystal growth process is carried out in a closed ...

Embodiment 3

[0025] In this embodiment, the raw material PbF with a purity greater than 99.99% is selected 2 , YbF 3 , ErF 3 And DyF 3 , Using Bridgeman method for crystal growth, successfully grown Ytterbium, Erbium, Dysprosium triple-doped PbF 2 Mid-infrared laser crystal, Yb 3+ The doping concentration of ions is 10at.%, Er 3+ The doping concentration is 15at.%, Dy 3+ The doping concentration is 5at.%. Before crystal growth, the raw materials are homogenized for 8 hours in a platinum crucible in the high temperature zone of 1050-1150℃, and kept for 3-5 hours to fully melt the raw materials; during the crystal growth period, the crucible is lowered into the crystal growth at a rate of 1.5-3mm / h After the crystal growth is over, in the cooling process, in order to prevent the crystal from cracking, the temperature is slowly reduced to room temperature at a cooling rate of 60-80°C / h. The entire crystal growth process is carried out in a closed state, and the grown PbF 2 The crystal is transp...

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Abstract

The invention discloses a 2.7-3 micrometer band intermediate infrared Yb-Er-Dy tri-doped lead fluoride laser crystal and a preparation method thereof. Specifically, Er<3+> ions act as activation ions,and Dy<3+> ions have the dual functions that: (1) as the energy level coupling ions of Er<3+> ions, Dy<3+> ions can reduce the <4>I13 / 2 energy level lifetime of Er<3+> ions; and (2) a small energy band gap exists between the <6>H11 / 2 energy level of Dy<3+> ions and the <4>I13 / 2 energy level of Er<3+> ions, energy transfer from the <4>I13 / 2 energy level of Er<3+> ions to the <6>H11 / 2 energy levelof Dy<3+> ions can be realized, and the energy level transition of Dy<3+> ions from <6>H13 / 2 to <6>H15 / 2 is facilitated, therefore 2.9 micrometer band fluorescence can be emitted. At the same time, Yb<3+> ions are introduced to solve the problem of low absorption efficiency of Er<3+> ions and Dy<3+> ions at the 970nm position and improve the crystal absorption efficiency.

Description

Technical field [0001] The invention relates to the technical field of mid-infrared laser materials, and in particular to a mid-infrared ytterbium, dysprosium, ytterbium, dysprosium, and lead fluoride (PbF2) laser crystal in the 2.7-3 micron band and a preparation method thereof. Background technique [0002] Mid-infrared lasers have a wide range of applications in atmospheric monitoring, medical surgery and scientific research. They can also be used in high-quality pump sources for long-wavelength pulsed lasers and optical parametric oscillators. Among the many luminescent ions, Er 3+ Ion and Dy 3+ Ions are effective ions for realizing 2.7-3 micron ultra-broadband laser output. Er 3+ Ionic 4 I 11 / 2 → 4 I 13 / 2 Energy level transition and Dy 3+ Ionic 6 H 13 / 2 → 6 H 15 / 2 Energy level transition can produce fluorescence in the 2.7-3μm band, but Er 3+ Ion upper energy level 4 I 11 / 2 The fluorescence lifetime is much lower than the lower energy level 4 I 13 / 2 It is difficult to form a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/12C30B11/00H01S3/16
CPCC30B11/00C30B29/12H01S3/1606H01S3/1608H01S3/1618H01S3/1645
Inventor 张沛雄汪瑞陈振强朱思祁尹浩李真
Owner JINAN UNIVERSITY
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