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Lead fluoride crystal co-doped with ytterbium and alkaline and preparation method thereof

A lead fluoride and crystal technology, applied in the field of ytterbium-alkali co-doped lead fluoride crystal and its preparation, can solve the problems of low emission cross-section and low fluorescence lifetime at the laser wavelength position, and achieve improved emission cross-section and fluorescence lifetime, high absorption and the effect of the emission cross section

Inactive Publication Date: 2011-05-18
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Ytterbium-doped lead fluoride crystals can be used as laser materials, but the emission cross section at the laser wavelength position is low and the fluorescence lifetime is not high

Method used

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  • Lead fluoride crystal co-doped with ytterbium and alkaline and preparation method thereof
  • Lead fluoride crystal co-doped with ytterbium and alkaline and preparation method thereof
  • Lead fluoride crystal co-doped with ytterbium and alkaline and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Growth of Yb by pulling method 0.03 :Na 0.03 :PbF 2 the crystal

[0023] Press YbF 3 , NaF, PbF 2 The molar ratio is 0.03:0.03:1 for batching, fully mixed and evenly pressed into blocks, put into a graphite crucible, and use PbF 2 The crystal is used as the seed crystal, and the growth atmosphere is CF 4 Protective gas, the pulling speed is 2 mm / hour, and the rotation speed is 12 revolutions / minute. After the growth is completed, it is cooled to room temperature at a cooling rate of 50° C. / hour. After the crystal is taken out, it is processed into 10×10×1mm 3 The sample is subjected to spectral test, and its absorption spectrum is as follows figure 1 As shown, the fluorescence spectrum as figure 2 shown. Now the test result of embodiment 1 is listed in table 1 and with Yb:YAG, Yb:CaF 2 performance comparison.

[0024] The present invention adopts alkali metal ion M (being Na + 、K + , Li + ) to balance Yb 3+ Ions replace Pb 2+ The resulting sy...

Embodiment 2

[0027] Embodiment 2: Growth of Yb by temperature gradient method 0.05 :K 0.05 :PbF 2 the crystal

[0028] Press YbF 3 , KF, PbF 2 The molar ratio is 0.05:0.05:1 for batching, fully mixed and evenly pressed into blocks, put into a graphite crucible, and place PbF at the bottom of the crucible 2 The crystal is used as the seed crystal, and the growth atmosphere is CF 4 Protective gas, cover the top of the crucible, raise the temperature at 50°C / hour to 820°C for 10 hours, then grow crystals at a cooling rate of 4°C / hour, and cool to room temperature at a cooling rate of 20°C / hour after growth.

Embodiment 3

[0029] Embodiment 3: growing Yb by crucible descending method 0.1 : Li 0.2 :PbF 2 the crystal

[0030] Press YbF 3 , LiF, PbF 2 The molar ratio is 0.1:0.2:1 for batching, fully mixed and evenly pressed into a block, put into a platinum crucible, and place PbF at the bottom of the crucible 2 The crystal is used as the seed crystal, and the growth atmosphere is CF 4 Protective gas, cover the top of the crucible. The crystal growth temperature gradient is set at 40°C / cm, the crucible is lowered at a speed of 3mm / hour, and cooled to room temperature at a cooling rate of 40°C / hour after the growth is completed.

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Abstract

The invention relates to a lead fluoride crystal co-doped with ytterbium and alkaline and a preparation method thereof. The structural formula of the crystal is Ybx: My: PbF2, and the growth method of the crystal includes the following steps: (1) the values of x and y are determined; (2) the raw material is weighed in proportion, is fully and evenly mixed and is pressed into blocks, the blocks are put into an iraurite, platinum or plumbago crucible, PbF2 crystal is adopted as a seed crystal, growth atmosphere is high purity argon or CF4 gas, and melt growth method is adopted. Experiments show that the crystal of the invention has large absorption and emission section, long fluorescence life time and high thermal conduction.

Description

technical field [0001] The invention relates to a laser crystal material, especially a ytterbium-alkali co-doped lead fluoride crystal and a preparation method thereof, which can be used in high repetition frequency, high power, tunable or ultrashort pulse lasers pumped by all-solid-state LDs . Background technique [0002] Laser technology has developed by leaps and bounds since the invention of the first laser, and has been widely used in industry, medical treatment, information science, biotechnology and military affairs. The application of laser technology in the national economy has been widely used in medical, communication, printing, and electronics industries. With the increase of laser power, high-energy laser can be used for cutting, drilling, welding and surface treatment of various materials. Because the laser can act on the workpiece from a long distance, it is suitable for environments that are harmful to the human body, such as the dismantling of nuclear pow...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G21/16C30B29/12C30B15/00C30B11/00
Inventor 杭寅何晓明张连翰
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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