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Nonlinear optical and ferroelectric crystals dimethylammonium germanium tetraborate and preparation method and application thereof

A dimethylammonium tetraboric acid, nonlinear optics technology, applied in crystal growth, chemical instruments and methods, single crystal growth and other directions, to achieve the effect of large light transmission range, high yield and good repeatability

Inactive Publication Date: 2015-06-17
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

Simultaneously synthesizing materials with nonlinear optical and ferroelectric properties is very challenging

Method used

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Embodiment Construction

[0011] 1. Preparation of compounds

[0012] GeO 2 (104mg, 1mmoL) with H 3 BO 3 (240mg, 4mmoL) of the mixture was added to 4mL of methylamino alcohol (V (CH 3 NH 2 ): V(CH 3 CH 2 OH)=1:2) solution in a polytetrafluoroethylene reactor, put it on a magnetic stirrer and stir for about two hours, put the polytetrafluoroethylene reactor into a stainless steel high-pressure reactor and seal it, and react at 160°C for 7 A colorless and transparent triangular prism crystal was obtained.

[0013] 2. Performance test

[0014] We tested the optical and ferroelectric properties of the obtained dimethylammonium germanium tetraborate, and its second-order nonlinear optical effect is about 2.0 times that of KDP. Its remnant polarization is about 0.98μC cm -2 , the coercive electric field is 22kV·cm -1 , with a spontaneous polarization of 1.26 μC cm -2 .

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Abstract

The invention relates to nonlinear optical and ferroelectric crystals dimethylammonium germanium tetraborate, a preparation method and application thereof. A chemical formula of the crystals is [Ge(B4O9)].2CH3NH3; the molecular weight is 323.97; the crystals belong to a monoclinic system; the space group is C2; and unit cell parameters are that: a is 10.249(1), b is 9.449(1), alpha is equal to gamma which is 90 degrees, beta is 131.76(2) degrees, and Z is 2. The dimethylammonium germanium tetraborate is prepared by a solvothermal method. The dimethylammonium germanium tetraborate has excellent nonlinear optical and ferroelectric properties. The powder second harmonic generation (SHG) coefficient of the dimethylammonium germanium tetraborate is 2.0 times that of potassium dihydrogen phosphate (KDP) and is equivalent to that of lithium triborate (LBO). The remanent polarization strength is about 0.98mu C.cm<-2>, the coercive field is 22kV.cm<-1>, and the spontaneous polarization strength is 1.26mu C.cm<-2>.

Description

technical field [0001] The invention relates to a material with nonlinear optics and ferroelectric properties, dimethylammonium germanium tetraborate (chemical formula: [Ge(B 4 o 9 )]·2CH 3 NH 3 ) preparation and application. Background technique [0002] Since the advent of laser, nonlinear optics has developed rapidly and has become an important branch of modern optics. Among the numerous nonlinear optical effects, the frequency doubling effect (SHG) is the most noticeable and the most studied nonlinear effect. It has important application value in high-tech fields such as laser frequency conversion, electro-optical modulation, and photorefractive information processing. Ferroelectric materials are also an important topic in current materials science. They have a wide range of applications, such as random access memories, filtering devices, and adjustable microwave devices. Synthesizing materials with nonlinear optical and ferroelectric properties simultaneously is v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/22C30B7/14
Inventor 杨国昱曹高娟
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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