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Selenium-silicon-silver-barium compound and selenium-silicon-silver-barium middle and far infrared non-linear optical crystal as well as preparation method and application thereof

A nonlinear optics and far-infrared technology, applied in chemical instruments and methods, crystal growth, elemental compounds other than selenium/tellurium, etc., can solve the problem of low laser damage threshold, two-photon absorption is not easy to obtain large-scale high-quality single crystal, it is difficult to output mid- and far-infrared lasers, etc., and achieve the effect of large laser damage threshold, excellent optical performance, and strong nonlinear optical effect

Active Publication Date: 2017-11-28
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of crystal has some serious shortcomings, such as low laser damage threshold, two-photon absorption problem for near-infrared laser (such as Nd:YAG 1064 nm), and severe anisotropic thermal expansion, which make it difficult to obtain large-scale high-quality single crystals. Crystal, etc., have severely limited their practical application
[0006] At present, although some oxide nonlinear optical crystals discovered in the world have already solved the problem of near-infrared frequency conversion, but for 3-5 mu For lasers in the m range, the lattice vibration frequency of many oxide crystals is equivalent to the laser frequency in this band, which causes a strong competition between non-radiative relaxation and laser emission, which will cause high passive loss of the laser, and it is difficult to output 4 mu Mid-to-far infrared lasers above m

Method used

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  • Selenium-silicon-silver-barium compound and selenium-silicon-silver-barium middle and far infrared non-linear optical crystal as well as preparation method and application thereof
  • Selenium-silicon-silver-barium compound and selenium-silicon-silver-barium middle and far infrared non-linear optical crystal as well as preparation method and application thereof
  • Selenium-silicon-silver-barium compound and selenium-silicon-silver-barium middle and far infrared non-linear optical crystal as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Preparation of compound selenium silicon silver barium polycrystalline powder:

[0032] a. Mix elemental Ba, elemental Ag, elemental Si and elemental Se in a molar ratio of 1:2:1:4 in a glove box filled with an inert gas nitrogen in an airtight container with a water content and an oxygen content of 0.01-0.1 ppm Put it into a clean graphite crucible after uniformity, and put it into a quartz glass tube with a length of 20 cm and a diameter of 10 mm. -5 -10 -3 Sealed after vacuuming under the condition of Pa;

[0033] b. Heat the sealed quartz tube in step a from room temperature to 400-700°C at a temperature of 20-40°C / h, keep it warm for 30-60 hours, and then raise the temperature to 800°C at a temperature of 20-40°C / h -1050 ℃, heat preservation for 70-110 hours to obtain the compound;

[0034] c. Cool the compound obtained in step b to room temperature at a rate of 2-7 °C / h, take out the sample and put it in a mortar, grind it, and grind it to obtain the dark red c...

Embodiment 2

[0036] Preparation of mid- and far-infrared nonlinear optical crystals of selenium, silicon, silver, and barium:

[0037] a. In a glove box filled with an inert gas nitrogen in an airtight container with a water content and an oxygen content of 0.01 ppm, put clean graphite after mixing evenly according to the molar ratio of Ba:Ag:Si:Se 1:2:1:4 In the crucible, put it into a quartz glass tube with a length of 20 cm and a diameter of 10 mm. -5 -10 -3 Sealed after vacuuming under the condition of Pa;

[0038] b. The quartz tube sealed in step a is raised from room temperature to 400°C at a heating rate of 20°C / h, and kept at a temperature of 30 hours, then raised to 800°C at a temperature of 20°C / h, and kept at a temperature of 70 hours;

[0039] c. Cool down to room temperature at a rate of 2 °C / h, take out the graphite crucible, and obtain dark red blocky barium selenium silicon silver barium BaAg 2 SiSe 4 The middle and far infrared nonlinear optical crystal is analyzed b...

Embodiment 3

[0041] Preparation of mid- and far-infrared nonlinear optical crystals of selenium, silicon, silver, and barium:

[0042] a. In a glove box filled with an inert gas nitrogen in an airtight container with a water content and an oxygen content of 0.05 ppm, the elemental Ba, elemental Ag, elemental Si and elemental Se are mixed evenly in a molar ratio of 1:2:1:4 Put it into a clean graphite crucible and put it into a quartz glass tube with a length of 20 cm and a diameter of 10 mm. -5 -10 -3 Sealed after vacuuming under the condition of Pa;

[0043] b. The quartz tube sealed in step a is raised from room temperature to 600°C at a heating rate of 40°C / h, and kept at a temperature of 50 hours, then raised to 1000°C at a temperature of 30°C / h, and kept at a temperature of 100 hours;

[0044] c. Cool down to room temperature at a rate of 4 °C / h, take out the graphite crucible, and obtain dark red blocky barium selenium silicon silver barium BaAg 2 SiSe 4 Middle and far infrared ...

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Abstract

The invention relates to a selenium-silicon-silver-barium compound, a selenium-silicon-silver-barium middle and far infrared non-linear optical crystal as well as a preparation method and application thereof. A chemical formula of the compound is BaAg2SiSe4, molecular weight of the compound is 697.01, the crystal is a tetragonal crystal system, a space group is of a non-centrosymmetry type (described in the specification), cell parameters comprise that a=b=7.066(3) angstrom, c=8.233(7) angstrom, alpha=beta=gamma=90 degrees and Z=2, and unit cell volume V=411.1(5) angstrom<3>. The preparation method comprises the step of carrying out solid-phase reaction on simple substances barium, silver, silicon and selenium under vacuum condition. Powder XRD spectra of the selenium-silicon-silver-barium compound and the selenium-silicon-silver-barium middle and far infrared non-linear optical crystal are consistent with theoretical values; and under irradiation of lasers with the wavelength of 2090nm, and frequency doubling effect of BaAg2SiSe4 with the granularity of 55-88 Mum is two times that of AgGaS2 with the same granularity.

Description

technical field [0001] The invention belongs to the field of infrared nonlinear optical crystal materials, and specifically relates to a selenium-silicon-silver-barium and mid-far infrared nonlinear optical crystal, a preparation method and an application thereof. Background technique [0002] As a high-intensity, directional coherent monochromatic light source, laser is widely used in scientific research, industry, transportation, national defense, medical and health and other related fields. However, the laser wave bands directly output by various lasers at present are limited, and there are still blank laser wave bands from the ultraviolet band to the infrared band. Due to the particularity of the laser generation mechanism, it is impossible to find a practical laser medium for every wavelength. Therefore, the use of nonlinear optical crystals for frequency conversion to obtain various laser sources with wide tuning has become a frontier topic in the development of laser...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/00C30B29/46C30B1/10
CPCC01B19/002C01P2002/77C30B1/10C30B29/46
Inventor 潘世烈年乐颜武奎
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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