Laser crystal of sodium tungstate with waveband of 2 microns

A laser crystal and sodium tungstate technology, applied in the field of optoelectronic materials, can solve the problems of high melting point of growth raw materials, poor thermal performance of crystals, slow growth rate, etc., and achieve the effects of high growth rate, small thermal effect and short cycle.

Inactive Publication Date: 2010-03-03
CHANGCHUN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing laser crystals capable of producing such lasers are potassium and rare earth compound tungstates doped with rare earth activating ions, such as Ho:KGW, Ho:KYW, Ho:Yb:KGW, Tm:Ho:KGW, etc. The crystalloid belongs to the monoclinic system and is grown by the top seed crystal pulling method. In order to avoid the phase transition during the growth process, it is necessary to add a flux to the melt so that the growth process proceeds at the phase transition temperature. However, this The measures lead to the reduction of solute in the melt, so the growth rate slows down and the growth cycle is long, such as the growth

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Thulium holmium double-doped sodium gadolinium tungstate, molecular formula: Tm:Ho:NaGd(WO 4 ) 2 , Simplified formula: Tm:Ho:NGW, laser peak wavelength 2.09μm, the growth process is as follows:

[0009] The raw materials used and their purity are, Tm 2 o 3 : 99.999%, Ho 2 o 3 : 99.995%, Gd 2 o 3 : 99.999%, Na 2 CO 3 : 99.9%, WO 3 : 99.99%. The molar ratio shown in the following formula is weighed:

[0010] wxya 2 o 3 +yHo 2 o 3 +(1-x-y)Gd 2 o 3 +Na 2 CO 3 +4WO 3 =2NaTm x Ho y Gd (1-x-y) (WO 4 ) 2 +CO 2 ↑

[0011] Grind and mix evenly, compact into blocks, and sinter at a temperature of 1000°C to generate polycrystalline material through solid-state reaction.

[0012] The medium-frequency induction heating and pulling method is used for growth, and the polycrystalline material is placed in a platinum crucible, which is also a heating element. The direction seed crystal is used for growth, the growth temperature is 1253°C, the cooling rate is ...

Embodiment 2

[0014] Holmium-ytterbium double-doped sodium gadolinium tungstate, molecular formula: Ho:Yb:NaGd(WO 4 ) 2 , Simplified formula: Ho:Yb:NGW, laser peak wavelength 2.09μm, the growth process is as follows:

[0015] The raw materials used and their purity are, Yb 2 o 3 : 99.999%, Ho 2 o 3 : 99.999%, Gd 2 o 3 : 99.999%, Na 2 CO 3 : 99.9%, WO 3 : 99.99%. The molar ratio shown in the following formula is weighed:

[0016] wxya 2 o 3 +yHo 2 o 3 +(1-x-y)Gd 2 o 3 +Na 2 CO 3 +4WO 3 =2NaYb x Ho y Gd (1-x-y) (WO 4 ) 2 +CO 2 ↑

[0017] Grind and mix evenly, compact into blocks, and sinter at a temperature of 1000°C to generate polycrystalline material through solid-state reaction.

[0018] The medium-frequency induction heating and pulling method is used for growth, and the polycrystalline material is placed in a platinum crucible, which is also a heating element. The direction seed crystal is used for growth, the growth temperature is 1253.5°C, the cooling rate...

Embodiment 3

[0020] Thulium holmium doped sodium yttrium tungstate, molecular formula: Tm:Ho:NaY(WO 4 ) 2 , Simplified formula: Tm:Ho:NYW, laser peak wavelength 2.09μm, the growth process is as follows:

[0021] The raw materials used and their purity are, Tm 2 o 3 : 99.999%, Ho 2 o 3 : 99.995%, Y 2 o 3 : 99.999%, Na 2 CO 3 : 99.9%, WO 3 : 99.99%. The molar ratio shown in the following formula is weighed:

[0022] wxya 2 o 3 +yHo 2 o 3 +(1-x-y)Y 2 o 3 +Na 2 CO 3 +4WO 3 =2NaTm x Ho y Y (1-x-y) (WO 4 ) 2 +CO 2 ↑

[0023] Grind and mix evenly, compact into blocks, and sinter at a temperature of 1000°C to generate polycrystalline material through solid-state reaction.

[0024] The medium-frequency induction heating and pulling method is used for growth, and the polycrystalline material is placed in a platinum crucible, which is also a heating element. The direction seed crystal is used for growth, the growth temperature is 1209°C, the cooling rate is 1-2°C / h, the p...

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PUM

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Abstract

The invention provides a laser crystal of sodium tungstate with waveband of 2 microns, belonging to a tetragonal system. The laser outputting the waveband of 2 microns has the characteristics of shortgrowth period, good integrality, high crystal yield, low threshold, high gain and the like. The prepared laser has high laser output efficiency and belongs to the field of photoelectron materials. The existing laser crystal of kalium and rare-earth compounded tungstate, mixed with rare-earth activated ion, has long growth period; furthermore, the laser crystal of rare-earth salt vanadate, mixed with the rare-earth activated ion, has the growing raw material with high melting point, thus easily causing segregation due to volatilization; and the grown crystal has bad thermal performance, is easy to crack and has colored core. The laser crystal is mixed with the rare-earth activated ion with the waveband of 2 microns, and the substrate is sodium and rare-earth compounded tungstate. The lasercrystal is applied to the fields such as distance measurement by laser, lidar, photoelectric interference, remote sensing, environmental detection, optical communication, medical treatment and the like.

Description

technical field [0001] The invention relates to a 2μm sodium tungstate laser crystal, which belongs to the tetragonal crystal system and outputs laser light in the 2μm band. It has the characteristics of short growth period, good integrity, high crystallization rate, low threshold value, and high gain. The produced laser The laser has high output efficiency and belongs to the field of optoelectronic materials. Background technique [0002] The laser in the 2μm band has the characteristics of good atmospheric transmission characteristics, strong smoke penetration ability, and good confidentiality. It is used in laser ranging, lidar, photoelectric interference, remote sensing, environmental detection, optical communication and other fields. In addition, the laser in the 2μm band has strong absorption in water, so it is not only safe for human eyes, but also can accurately intervene in biological tissues, and has application value in medical fields such as ophthalmic surgery. ...

Claims

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Application Information

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IPC IPC(8): C30B29/32H01S3/16
Inventor 刘景和林海李春张学建曾繁明秦杰明张莹刘立新张山丽
Owner CHANGCHUN UNIV OF SCI & TECH
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