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A kind of preparation method and application of low-temperature phase barium germanate crystal

A phase-phase barium germanate crystal technology, which is applied in the field of preparation of low-temperature phase-phase barium germanate crystals, achieves the effects of large Raman gain coefficient, good Raman spectrum performance, and high laser output efficiency

Inactive Publication Date: 2020-12-25
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no low-temperature phase BaGeO at home and abroad 3 Reports on the growth, properties and applications of crystals

Method used

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  • A kind of preparation method and application of low-temperature phase barium germanate crystal
  • A kind of preparation method and application of low-temperature phase barium germanate crystal
  • A kind of preparation method and application of low-temperature phase barium germanate crystal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Growth of low temperature phase BaGeO by high temperature solution method 3 the crystal

[0032] (1) BaGeO 3 Synthesis of Polycrystalline Raw Materials

[0033] Weigh analytically pure BaCO according to the stoichiometric ratio 3 and GeO 2 , fully ground and mixed and then transferred to a corundum crucible. In a tube furnace, first sinter at 1000°C for 12 hours. After cooling to room temperature, the obtained intermediate product was ground again and transferred to a corundum crucible, and then sintered in a tube furnace at 1000°C for 12 hours. Take it out after natural cooling to room temperature to get BaGeO 3 Raw material for polycrystalline growth. Its reaction equation is:

[0034] BaCO 3 + GeO 2 = BaGeO 3 +CO 2 ↑

[0035] (2) Na2 MoO 4 Polycrystalline (Flux) Synthesis

[0036] Weigh analytically pure Na according to the stoichiometric ratio 2 CO 3 and MoO 3 , in accordance with BaGeO 3 In a similar method for polycrystalline synthesis, first s...

Embodiment 2

[0039] Example 2: Low temperature phase BaGeO 3 Infrared Transmission Spectrum and Raman Spectrum of Crystal

[0040] With the BaGeO obtained in embodiment 1 3 The single crystal is processed into a crystal slice of 5 mm × 5 mm × 1 mm, and its infrared transmission spectrum is measured. The results are as follows image 3 As shown, the result shows: BaGeO 3 The crystal has high transmittance in the wavelength range of 3-5 μm, and its infrared transmission cut-off edge is near 5.8 μm.

[0041] The BaGeO that embodiment 1 obtains 3 The crystal is tested by Raman spectrum. The experiment uses a Jobin Y’von Raman spectrometer, and the excitation light source is Ar + The 514.5 nm wavelength laser output by the laser reaches the sample with a power of about 1 mW. The optical path adopts a backscatter confocal collection system, and the scattered light is focused on the incident slit of the monochromator. The slit width is 300 μm, and the spectral resolution is about 2 cm –1 ....

Embodiment 3

[0043] The low-temperature phase BaGeO obtained by the crystal growth method described in Example 1 3 The crystal is cut into a crystal rod with a size not less than 10 mm in the direction of light transmission. Then polish the light-transmitting surface of the crystal to prepare a stimulated Raman scattering frequency shift device. The BaGeO was pumped with an Er:YAG laser at a wavelength of 2.94 μm 3 The crystal frequency shifter, by adjusting the power density of the pump laser, obtains mid-infrared lasers with wavelengths of 3.84 μm and 5.56 μm. The structure diagram of the Raman frequency converter is as follows: Figure 5 shown.

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Abstract

The invention discloses a preparation method and application of a low temperature phase barium germinate crystal. The crystal grows and is prepared by adopting a high-temperature solution method; selected fluxing agents comprise alkali metal molybdate, alkali metal tungstate, alkali metal borate, Bi2O3 and PbO; the ratio of the fluxing agents to crystal growing raw materials is 15 to 50 mol%; a platinum crucible is a container; the cooling rate of the crystal in a growing process is 1 to 3 DEG C per day; and the rotating speed of the crystal is 1 to 10 r / min. A vibration mode of the stimulatedRaman scattering activity of the crystal is located at 799 cm<-1>; the half width of a vibration peak is 4.5 cm<-1>; and an infrared transmission stop edge of the vibration peak is located at 5.8 microns. The crystal can be used as a stimulated Raman scattering crystal, realizes laser frequency variation in a middle-infrared band, and outputs middle-infrared laser having a wavelength range of 3 to 5.8 microns.

Description

technical field [0001] The invention relates to a method for preparing a low-temperature phase barium germanate crystal and its application, and belongs to the technical fields of artificial crystal growth and laser technology. Background technique [0002] The mid-infrared laser in the 3-5μm band has a strong ability to penetrate the atmosphere, and many biological and organic molecules have characteristic absorption peaks in this band. Therefore, lasers in the 3-5 μm band have great application potential in both military and civilian fields. Among them, the applications in the military field include: laser guidance, infrared countermeasures, infrared remote sensing, laser communication, infrared ranging, etc.; the applications in the civilian field include: toxic trace gas detection, medical diagnosis and treatment, molecular spectroscopy, etc. [0003] Using the stimulated Raman scattering effect of solid matter to convert the frequency of short-wavelength lasers is an i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B9/12C30B29/32
CPCC30B9/12C30B29/32
Inventor 万松明张树杰姚亚楠
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI