Oxo-sulfide nonlinear optical crystal and preparation method and application thereof

A nonlinear optics and crystal technology, applied in nonlinear optics, chemical instruments and methods, optics, etc., can solve the problems of low anti-laser damage threshold and small nonlinear response

Pending Publication Date: 2022-07-29
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, ZnGeP currently available in the infrared band 2 , AgGaS 2 and AgGaSe 2 Such crystals have disadvantages such as small nonlinear response and low laser damage threshold, which limit their large-scale use.

Method used

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  • Oxo-sulfide nonlinear optical crystal and preparation method and application thereof
  • Oxo-sulfide nonlinear optical crystal and preparation method and application thereof
  • Oxo-sulfide nonlinear optical crystal and preparation method and application thereof

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preparation example Construction

[0028] In some embodiments, nonlinear optical crystal A 2 CdGe 2 OS 6 The preparation method may include:

[0029] (a) the raw materials containing the molar ratio of 2~3:1:2:1~2:6~8 alkaline earth or rare earth element, cadmium element, germanium element, oxygen element and sulfur element are mixed uniformly, put into the reaction vessel, Seal after vacuuming.

[0030] (b) putting the sealed reaction vessel in step (a) into a muffle furnace, heating up to 700-900° C., keeping the temperature for a period of time, and then cooling to room temperature to obtain A 2 CdGe 2 OS 6 .

[0031] The invention provides a new type of infrared nonlinear optical crystal and its preparation method and application, and its chemical formula is A 2 CdGe 2 OS 6 , wherein A is selected from alkaline earth or rare earth metals. This kind of crystal has both large nonlinear response intensity and high laser damage threshold. Infrared nonlinear optical crystal A of the present invention ...

Embodiment 1

[0036] Sr 2 CdGe 2 OS 6 Preparation of crystals: Weigh 0.1036g SrO, 0.1197g SrS, 0.1445g CdS and 0.1368gGeS 2 (i.e. SrO, SrS, CdS, GeS with a molar ratio of 1:1:1:2 2 ), fully ground and mixed in a mortar and evenly, then transferred to a quartz tube with an inner diameter of 1 cm for vacuum packaging, and evacuated to 0.1 Pa. Put the sealed quartz tube into the muffle furnace, and set the insulation program as follows: raise the temperature to 850°C for 10 hours, keep at 850°C for 48 hours, then cool down to 650°C at a cooling rate of 3°C per hour, and then naturally cool to room temperature . The product is taken out from the quartz tube to obtain Sr 2 CdGe 2 OS 6 Crystals, some of which are millimeter-sized.

Embodiment 2

[0038] Performance Testing:

[0039] 1) powder X-ray diffraction test is carried out after the obtained crystal is ground, and the results are as follows figure 2 shown. The obtained powder X-ray diffraction pattern and the single crystal structure analysis of the obtained Sr 2 CdGe 2 OS 6 The theoretical X-ray diffraction patterns of the crystals are consistent, which proves that the obtained crystals have high purity.

[0040] 2) Determination of Sr using UV-Vis-NIR diffuse reflectance spectrometer 2 CdGe 2 OS 6 The band gap of the crystal, the result is as image 3 shown, its band gap is 3.0 eV. compared to AgGaS 2 The band gap of the crystal is 2.64 eV, and the compound has a wider band gap.

[0041] 3) For the obtained Sr 2 CdGe 2 OS 6 The crystals were characterized by infrared spectroscopy, and the results were as follows Figure 4 As can be seen from the figure, the infrared absorption cut-off edge of the obtained crystal is 13.6 μm, and its optical tran...

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Abstract

The invention relates to an oxysulfide nonlinear optical crystal and a preparation method and application thereof, the chemical general formula of the infrared nonlinear optical crystal is A2CdGe2OS6, A is selected from one or a combination of more of alkaline earth metals Ca, Sr and Ba or rare earth metals Eu, the infrared nonlinear optical crystal belongs to a tetragonal system, the space group has a layered structure, and the thickness of the infrared nonlinear optical crystal is 10-20nm. [CdGe2OS6] < 4-> layers and alkaline earth metal or rare earth metal ions between the layers are stacked in the c-axis direction, Cd is coordinated with four adjacent S to form a [CdS4] < 6-> tetrahedron, Ge is coordinated with three surrounding S and one O to form a [GeOS3] < 4-> tetrahedron, the [CdS4] < 6-> tetrahedron is mutually connected with four [GeOS3] < 4-> tetrahedrons through a common vertex, and the [GeOS3] < 4-> tetrahedrons are mutually connected through a common vertex O.

Description

technical field [0001] The invention relates to an inorganic crystal material, its preparation and its application as a nonlinear optical crystal, and belongs to the field of inorganic materials. Background technique [0002] Mid- and far-infrared lasers with wavelengths ranging from 3 to 20 μm play a pivotal role in laser guidance, photoelectric countermeasures, infrared laser communication, environmental monitoring, and drug inspections. Infrared nonlinear optical crystals are the core components that determine the output power and tunable range of infrared lasers, and are a class of crystal materials with great strategic value. The ideal infrared nonlinear optical crystal should have the characteristics of large nonlinear response, high laser damage threshold, wide optical transmission range, and easy crystal growth. However, the current practical ZnGeP in the infrared band 2 , AgGaS 2 and AgGaSe 2 Such crystals have shortcomings such as small nonlinear response and l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/46C30B1/10G02F1/355
CPCC30B29/46C30B1/10G02F1/3551
Inventor 黄富强王瑞琦
Owner PEKING UNIV
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