Thulium-doped sodium yttrium fluoride laser crystal and preparation method thereof

A technology of sodium thulium yttrium fluoride and laser crystals, which is applied in the field of thulium-doped sodium yttrium fluoride laser crystals and its preparation, can solve the problems of affecting luminous efficiency, poor physical and chemical properties and stability, and high phonon energy, and achieve high-efficiency laser output , good emission characteristics, and low phonon energy

Inactive Publication Date: 2014-05-07
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

YAG oxide crystal has good physical and chemical properties, but the phonon energy is relatively high, which affects Tm 3+ luminous efficiency; LiYF 4 Single crystal has low phonon energy and high mid-infrared transmittance, but its physical and chemical properties and stability are relatively poor

Method used

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  • Thulium-doped sodium yttrium fluoride laser crystal and preparation method thereof
  • Thulium-doped sodium yttrium fluoride laser crystal and preparation method thereof
  • Thulium-doped sodium yttrium fluoride laser crystal and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh 55.50mol% NaF raw materials, 99.99% YF with a purity greater than 99.99% 3 Raw material 41.1mol%, 99.99% EuF 3 The raw material is 3.4mol%, mixed and placed in a mill, milled and mixed for 5 to 6 hours to obtain a uniform powder mixture; loosely put the mixture in a boat-shaped platinum crucible, and then install the boat-shaped platinum crucible In the platinum tube of the tube resistance furnace, then use high-purity N 2 Gas removes the air in the platinum pipe, and conducts leak detection on the platinum pipe; then gradually raises the furnace body temperature of the tubular resistance furnace to 810°C, passes HF gas, and reacts for 3 hours to remove possible H 2 O and oxyfluoride, during the reaction process, use NaOH solution to absorb HF gas in the tail gas. After the reaction, stop passing HF gas, close the tube resistance furnace, and finally use high-purity N 2 The gas removes the residual HF gas in the platinum pipeline to obtain polycrystalline powder...

Embodiment 2

[0025] It is basically the same as Example 1, the difference is only NaF raw material 55.50mol%, YF 3 Raw material 44.22mol%, TmF 3 The raw material is 0.28mol%, the reaction time in the platinum tube is 5 hours, the temperature gradient of the solid-liquid interface is 65°C / cm, the crystal growth rate is 0.2mm / h, and the furnace temperature drop temperature is 80°C / h, and the Tm 3+ Doped with NaYF 4 crystals. The X-ray diffraction pattern of the sample is similar to Example 1. The rare earth Tm in the single crystal 3+ Concentration is 0.29mol%, α=0.0029, the sample that is obtained is polished into the same 2 millimeters of thickness flakes with embodiment 1, keeps the same optical test condition with embodiment 1, the fluorescence intensity that obtains is comparable with embodiment 1 sample . Absorption spectrum see figure 2 , the fluorescence spectrum see image 3 , Tm 3+ The doping concentration of ions, relative fluorescence intensity at 1.8 μm, and fluorescence ...

Embodiment 3

[0027] It is basically the same as Example 1, the difference is only NaF raw material 55.50mol%, YF 3 Raw material 44.03mol%, TmF 3 The raw material is 0.47mol%, the reaction time in the platinum tube is 4.5 hours, the temperature gradient of the solid-liquid interface is 70°C / cm, the crystal growth rate is 1.2mm / h, and the furnace temperature drop temperature is 65°C / h, and Tm 3+ Doped with NaYF 4 crystals. The X-ray diffraction pattern of the sample is similar to Example 1. The rare earth Tm in the single crystal 3+ Concentration is 0.49mol%, α=0.0049, the sample that is obtained is polished into the same 2 millimeters of thickness flakes with embodiment 1, keeps the same optical test condition with embodiment 1, the fluorescent intensity that obtains is comparable with embodiment 1 sample . Absorption spectrum see figure 2 , the fluorescence spectrum see image 3 , Tm 3+ The doping concentration of ions, relative fluorescence intensity at 1.8 μm, and fluorescence l...

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Abstract

The invention discloses a thulium-doped sodium yttrium fluoride laser crystal and a preparation method thereof. Tm<3+> rare earth ions are doped into a NaYF4 crystal to generate a monocrystal of which the chemical formula is NaY(1-alpha)TmalphaF4. The lithium yttrium fluoride monocrystal has the advantages of high solubility for Tm<3+> ions and favorable thermal, mechanical and chemical stability. The rare earth ions doped in the monocrystal have high luminescence efficiency; and by adopting a water-free oxygen-free sealed crucible descending process and carrying out high-temperature fluoridation treatment on the raw material, the preparation method can be used for preparing the high-quality crystal which is almost free of hydroxide ions and oxides. Under the excitation of an 800nm-wavelength LD, the crystal has strong 1.8 mu m fluorescence emission; and the obtained crystal has long fluorescence lifetime in the 1.8 mu m wave range, and thus, can be used as a middle-infrared laser crystal in a laser unit.

Description

technical field [0001] The invention relates to a special fluoride single crystal, in particular to a thulium-doped yttrium sodium fluoride laser crystal and a preparation method thereof. Background technique [0002] Solid-state lasers in the 1.8-2.0 μm band that are safe for human eyes have important applications in the fields of radar, remote sensing, ranging, environmental detection, bioengineering, and medical treatment. Rare earth ion Tm 3+ middle 3 f 4 - 3 h 6 The energy level transition of the can produce fluorescence radiation in the ~1.8μm band range. T m 3+ Due to the strong energy cross-relaxation effect between ions ( 3 h 6 , 3 h 4 → 3 f 4 , 3 f 4 ), the quantum efficiency can reach 200% when excited by light. Such a high quantum efficiency makes up for the low efficiency phenomenon caused by the huge energy difference between the pump light and the infrared laser in the mid-infrared laser device. On the other hand, Tm 3+ Ions have a strong abso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/12C30B11/00H01S3/16
Inventor 夏海平李珊珊符立董艳明唐磊汪沛渊彭江涛张约品
Owner NINGBO UNIV
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