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A kind of nonlinear optical crystal strontium lithium silicon sulfur and its preparation method and application

A technology of nonlinear optics and crystals, applied in the fields of nonlinear optics, chemical instruments and methods, optics, etc., can solve the problem that anisotropic thermal expansion is difficult to obtain large-size, high-quality single crystals, etc., and achieve high laser damage threshold and excellent Optical performance, the effect of large nonlinear optical coefficient

Active Publication Date: 2020-10-02
HEBEI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Today's practical infrared nonlinear optical materials are mostly ABC 2 Type chalcopyrites, such as AgGaS 2 and ZnGeP 2 and other commercialized crystals, but these crystals have some serious deficiencies, such as low laser damage threshold, two-photon absorption problems for near-infrared lasers (such as Nd:YAG 1064 nm), severe anisotropic thermal expansion that makes it difficult to Obtaining large-size, high-quality single crystals, etc., therefore, how to prepare mid-to-far infrared nonlinear optical crystals with high laser damage threshold is one of the current research hotspots

Method used

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  • A kind of nonlinear optical crystal strontium lithium silicon sulfur and its preparation method and application
  • A kind of nonlinear optical crystal strontium lithium silicon sulfur and its preparation method and application
  • A kind of nonlinear optical crystal strontium lithium silicon sulfur and its preparation method and application

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Effect test

Embodiment 1

[0044] Weigh the starting material 0.119 g SrS and 0.046 g Li in a glove box filled with inert gas argon with a water content and an oxygen content of 0.01 ppm 2 S and 0.092 g SiS 2 , The molar ratio of the three is 1:1:1. Grind the weighed raw materials evenly in a mortar, then put them into a clean graphite crucible, and then put them into a quartz glass tube with a length of 20 cm and a diameter of 10 mm , Put the quartz glass tube filled with raw materials in a vacuum of 10 -3 Vacuum and seal under the condition of Pa; raise the sealed quartz glass tube from room temperature to 400 ℃ at a temperature rise rate of 30 ℃ / h, keep it for 10 hours, and then raise it to 800 ℃ at a temperature of 30 ℃ / h, keep it warm 80 h, the components in the raw material composition reacted to obtain the compound; finally, the temperature was cooled to room temperature at a rate of 5°C / h, and the sample was taken out and placed in a mortar to grind to obtain colorless and transparent small partic...

Embodiment 2

[0050] Weigh the starting material SrS:Li in a glove box filled with inert gas argon with a water content and an oxygen content of 0.01 ppm 2 S: SiS 2 , The molar ratio of the three is 1:2:1, grind in a mortar and put it into a clean graphite crucible, put it into a quartz glass tube with a length of 20 cm and a diameter of 10 mm. The glass tube has a vacuum of 10 -3 Vacuum and seal under the condition of Pa; then the sealed quartz glass tube is raised from room temperature to 400°C at a temperature rise rate of 20°C / h, kept for 7 hours, and then heated to 750°C at a temperature of 30°C / h. Keep for 70 hours; finally, cool down to room temperature at a rate of 2 ℃ / h, take out the graphite crucible, and obtain colorless and transparent small particles of SrLi 2 SiS 4 Single crystal, through single crystal X-ray diffraction analysis, indicated that the crystal is a strontium lithium silicon sulfur crystal.

Embodiment 3

[0052] Weigh the starting material SrS:Li in a glove box filled with inert gas argon with a water content and an oxygen content of 0.05 ppm 2 S: SiS 2 The molar ratio is 1:3:1, grind in a mortar and put it into a clean graphite crucible, put it into a quartz glass tube with a length of 20 cm and a diameter of 10 mm, and place the quartz glass tube with raw materials in a vacuum Degree 10 -3 Vacuumed and sealed under Pa; then the sealed quartz glass tube was raised from room temperature to 600 ℃ at a temperature rise rate of 40 ℃ / h, kept for 10 hours, and then heated at a temperature of 30 ℃ / h to 900 ℃, Keep for 80 h; finally, cool down to room temperature at a temperature of 4 ℃ / h, take out the graphite crucible, and obtain colorless and transparent small particles of SrLi 2 SiS 4 Single crystal.

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Abstract

The invention provides nonlinear optical crystal strontium lithium silicon sulfur and a preparation method and application thereof. The chemical formula of the nonlinear optical crystal strontium lithium silicon sulfur is SrLi2SiS4, the molecular weight is 257.83, and the nonlinear optical crystal strontium lithium silicon sulfur is a colorless and transparent monocrystal with an asymmetric structure, and structural elements are composed of [LiS4], [SiS4] and [SrS8] groups. The preparation method adopts a high-temperature solid-phase synthesis method to synthesize the nonlinear optical crystalstrontium lithium silicon sulfur which has excellent optical performance, long infrared absorption cutoff edge, wide band gap, high laser damage threshold value and large nonlinear optical coefficient, and has wide potential application value in high-power infrared laser systems as a novel mid-far infrared nonlinear optical crystal.

Description

Technical field [0001] The invention relates to a laser frequency doubling crystal in the middle and far infrared waveband, in particular to a nonlinear optical crystal strontium lithium silicon sulfur and a preparation method and application thereof. Background technique [0002] With the advent of lasers, a series of novel optical phenomena have been discovered one after another, and nonlinear optical effects are one of them. In 1961, Franken irradiated a ruby ​​laser onto a quartz crystal, and discovered the nonlinear optical frequency doubling effect for the first time, and immediately opened the prelude to the research of nonlinear optical materials. [0003] The nonlinear optical effect comes from the interaction between the laser and the medium. When a laser with a certain polarization direction passes through a nonlinear optical crystal (such as AgGaS 2 ), the frequency of the beam will change. When the laser propagates in a medium with a non-zero second-order polarizabili...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/46G02F1/355C01B33/00C30B1/10
CPCC01B33/00C01P2002/72C01P2002/77C01P2002/82C01P2006/40C30B1/10C30B29/46G02F1/3551
Inventor 武奎杨亚
Owner HEBEI UNIVERSITY
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