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Intermediate infrared nonlinear optical crystal barium titanium germanate and application thereof and intermediate infrared nonlinear laser system

A nonlinear optics and laser system technology, applied in the field of laser frequency doubling crystals in the mid-infrared band, can solve the problems of small laser damage threshold, low infrared transmittance, low frequency doubling efficiency, etc., and achieves wide infrared transmittance range, excellent Optical performance, the effect of large nonlinear optical coefficient

Inactive Publication Date: 2020-08-18
HEBEI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] One of the objectives of the present invention is to provide a mid-infrared nonlinear optical crystal barium titanium germanate to solve the problems of low laser damage threshold, low frequency doubling efficiency, narrow band gap, and low infrared transmittance of existing nonlinear crystal materials.

Method used

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  • Intermediate infrared nonlinear optical crystal barium titanium germanate and application thereof and intermediate infrared nonlinear laser system
  • Intermediate infrared nonlinear optical crystal barium titanium germanate and application thereof and intermediate infrared nonlinear laser system
  • Intermediate infrared nonlinear optical crystal barium titanium germanate and application thereof and intermediate infrared nonlinear laser system

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Embodiment 1

[0035] Preparation of barium titanate germanate crystals: starting material BaCO 3 、TiO 2 、GeO 2 The molar ratio was 2:1:2, ground in a mortar evenly, put into a clean corundum crucible, put into a muffle furnace, preheated the mixture at 1000 °C for 10 h, then raised the temperature to 1050 °C and Keep for 48 h, and then quickly cool down to room temperature. Take out the sample and put it into a mortar for grinding to get colorless and transparent small particles Ba 2 TiGe 2 o 8 single crystal.

[0036] The obtained barium titanium germanate microcrystalline powder is carried out powder X-ray diffraction analysis, and obtained result is as follows figure 1 shown. It can be seen from the figure that the obtained X-ray diffraction pattern is consistent with the Ba 2 TiGe 2 o 8 Theoretical X-ray Spectrum Figure 1 The experimental value is in good agreement with the theoretical value. The a-direction and c-direction structures of the obtained crystals are shown in ...

Embodiment 2

[0042] Preparation of barium titanate germanate crystals: starting material BaCO 3 、TiO 2 、GeO 2 The molar ratio is 2:1:2, grind it evenly in a mortar, put it into a clean corundum crucible, put it into a muffle furnace, preheat the mixture at 600 °C for 6 h, and preheat at 1000 °C for 10 h , then the temperature was raised to 1050 °C and kept for 48 h, and then rapidly dropped to room temperature. Take out the sample and grind it in a mortar to obtain small colorless transparent particles Ba 2 TiGe 2 o 8 Single crystal, analyzed by single crystal X-ray diffraction, shows that the crystal is barium titanate germanate crystal.

Embodiment 3

[0044] Preparation of barium titanate germanate crystals: starting material BaCO 3 、TiO 2 、GeO 2 The molar ratio is 2:1:2, put it into a clean corundum crucible after grinding it evenly in a mortar, put it into a muffle furnace, preheat the mixture at 800°C for 5 h, and then at 1000°C for 10 h, Then the temperature was raised to 1050 °C and maintained for 48 h, and then rapidly lowered to room temperature. Take out the sample and grind it in a mortar to obtain small colorless transparent particles Ba 2 TiGe 2 o 8 Single crystal, analyzed by single crystal X-ray diffraction, shows that the crystal is barium titanate germanate crystal.

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Abstract

The invention provides an intermediate infrared nonlinear optical crystal barium titanium germanate and an application thereof and an intermediate infrared nonlinear laser system. An XRD spectrogram of the intermediate infrared nonlinear optical crystal barium titanium germanate is shown in figure 1, and cell parameters comprise a=12.310 (1), b=12.292 (1), c=5.366 (1), and alpha=beta=gamma=90 degrees; the structure is a Cmm2 space group; the melting point is 1049.9 DEG C, and the crystallization point is 1164.1 DEG C; the band gap is 3.14 eV; phase matching from 2.09 [mu]m to 1.045 [mu]m is achieved, and the frequency doubling effect of the powder is 1.2 times that of AgGaS2 crystals under the same granularity and 6 times that of KDP crystals under the same granularity. The intermediate infrared nonlinear optical crystal barium titanium germanate disclosed by the invention has excellent optical performance, is large in band gap, wide in infrared transmission range, capable of coveringan atmospheric transparent window of 3-5 [mu]m, high in laser damage threshold value and large in nonlinear optical coefficient, and has wide potential application value in infrared communication devices, infrared laser guidance devices and high-power intermediate infrared laser systems.

Description

technical field [0001] The invention relates to a mid-infrared band laser frequency doubling crystal, in particular to a mid-infrared nonlinear optical crystal barium titanium germanate, its application and a mid-infrared nonlinear laser system. Background technique [0002] In 1961, Franken irradiated a ruby ​​laser on a quartz crystal, and discovered the nonlinear optical frequency doubling effect for the first time, which immediately opened the prelude to the study of nonlinear optical (NLO) materials. The nonlinear optical effect is caused by the interaction between the laser and the medium. When a laser beam with a certain polarization direction passes through a nonlinear optical crystal in a certain incident direction, the frequency of the beam will change. With the advent of lasers, new developments in nonlinear optics were brought. [0003] Nonlinear optical crystal materials can be divided into three categories according to their transmission range: middle and far ...

Claims

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Application Information

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IPC IPC(8): C30B29/32C30B1/10G02F1/35G02F1/355
CPCC30B1/10C30B29/32G02F1/3544G02F1/3551
Inventor 张兵兵喻进张晓东
Owner HEBEI UNIVERSITY
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