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Tm<3+> self-activated laser crystal and preparation method thereof

A laser crystal, self-activation technology, applied in the direction of lasers, crystal growth, laser components, etc., to achieve the effect of increasing concentration, improving laser efficiency, and reducing laser threshold

Active Publication Date: 2020-10-13
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no Tm at home and abroad 3+ Self-activated laser crystal ATm(MoO 4 ) 2 , where A is selected from at least one of Li, Na and K elements, as a related report of 2 micron infrared laser crystal

Method used

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  • Tm&lt;3+&gt; self-activated laser crystal and preparation method thereof

Examples

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Effect test

Embodiment 1

[0028] This embodiment discloses a Tm 3+ Self-activated laser crystal ATm(MoO 4 ) 2 , wherein A is selected from at least one of Li, Na and K elements, and, Tm 3+ The ions have a dual role, on the one hand, as activating luminescent ions, on the other hand, as a part of the crystal matrix, thereby greatly increasing its concentration, which is beneficial to Tm 3+ 2 micron fluorescence emission of ions, lowering lasing threshold and increasing laser efficiency. The crystal can be grown by pulling method or molten salt method. Using this kind of crystal as a gain medium and pumping with a semiconductor laser with a central emission wavelength of 760-810nm can achieve high-efficiency infrared laser output near 2 microns, which has important application prospects in medical, scientific research, and military fields.

Embodiment 2

[0030] This embodiment discloses a LiTm(MoO 4 ) 2 Self-activated laser crystals and their growth by pulling method.

[0031] high purity Li 2 CO 3 , Tm 2 o 3 , MoO 3 The raw materials are mixed according to the molar ratio Li:Tm:Mo=1:1:2.1 to form a mixture, and the mixture is placed on a mixer for mixing. The mixing time is 12 hours, and it becomes a uniform powder. Under the pressure of 3Gpa Press it into a cylindrical block with a diameter of 50mm, then put the block into a muffle furnace for sintering, the sintering temperature is 500°C, and the sintering time is 25 hours, and then put the sintered block into a platinum with a diameter of 60mm Put the crucible into the pulling furnace for crystal growth, raise the temperature to 50°C above the melting point, keep the temperature for 2 hours, completely melt the block, and then keep the temperature for 3 hours, the temperature field is constant, and then slowly drop the seed crystal into the melt, Start crystal growt...

Embodiment 3

[0033] This embodiment discloses a NaTm(MoO 4 ) 2 Self-activated laser crystals and their growth by pulling method.

[0034] high purity Na2 CO 3 , Tm 2 o 3 , MoO 3 The raw materials are mixed according to the molar ratio Na:Tm:Mo=1:1:2.2 to form a mixture, and the mixture is placed on a mixer for mixing. The mixing time is 15 hours, and it becomes a uniform powder. Under the pressure of 4Gpa Pressed into a cylindrical block with a diameter of 50mm, and then put the block into a muffle furnace for sintering, the sintering temperature is 520°C, and the sintering time is 30 hours, and then the sintered block is put into a platinum plate with a diameter of 60mm Put the crucible into the pulling furnace for crystal growth, raise the temperature to 50°C above the melting point, keep the temperature for 1 hour, completely melt the block, and then keep the temperature for 2 hours, the temperature field is constant, and then slowly drop the seed crystal into the melt, Start crys...

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Abstract

The invention discloses a Tm<3+> self-activated laser crystal and a preparation method thereof, and relates to the field of infrared laser gain materials. The chemical general formula of the laser crystal is ATm (MoO4)2, wherein A is selected from at least one of Li, Na and K elements. In the crystal, the Tm<3+> ions have dual effects, on the one hand, the Tm<3+> ions are used as active luminescent ions, and on the other hand, the Tm<3+> ions are used as one part of a crystal matrix, so that the concentration is greatly improved, 2-micron fluorescence emission of the Tm<3+> ions is facilitated, the laser threshold is reduced and the laser efficiency is improved. The crystal can grow by adopting a Czochralski method or a molten salt method. The crystal is adopted as a gain medium, efficientinfrared laser output near 2 microns can be achieved by utilizing semiconductor laser pumping with the central emission wavelength of 760-820nm, and the crystal has important application prospects inthe fields of medical treatment, scientific research, military affairs and the like.

Description

technical field [0001] The invention relates to the technical field of laser crystal gain materials, in particular to a Tm 3+ Self-activated laser crystal and method for its preparation. Background technique [0002] Lasers in the band near 2 microns have broad application prospects in civil and military fields such as communications, air pollution monitoring, sensing, medical treatment, engineering control, remote sensing, and lidar. Among many luminescent ions, thulium ion (Tm 3+ ) is one of the effective ions to achieve laser output in the vicinity of 2 microns. T m 3+ Rich ion energy levels, ground state 3 h 6 Tm on energy level 3+ After absorbing the pump light with a wavelength of about 800nm, the ions transition to 3 h 4 energy level, at 3 h 4 Tm of energy level 3+ Ions with adjacent Tm in the ground state 3+ The ions interact, this process is called the cross-relaxation process, expressed as: Tm 3+ ( 3 h 4 )+Tm 3+ ( 3 h 6 )→2Tm 3+ ( 3 f 4 ), then...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/32C30B15/00C30B9/06H01S3/16
CPCC30B29/32C30B15/00C30B9/06H01S3/1616
Inventor 张沛雄王宇皓廖家裕李真尹浩朱思祁陈振强
Owner JINAN UNIVERSITY
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