CN103789831B - Non-linear optical crystal of iodic acid bismuth rubidium and its preparation method and application - Google Patents
Non-linear optical crystal of iodic acid bismuth rubidium and its preparation method and application Download PDFInfo
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- 239000013078 crystal Substances 0.000 title claims abstract description 49
- 230000003287 optical effect Effects 0.000 title claims abstract description 30
- 238000002360 preparation method Methods 0.000 title claims abstract description 7
- HJNGZRMNIZQFMR-UHFFFAOYSA-N [Rb].[Bi].I(=O)(=O)O Chemical compound [Rb].[Bi].I(=O)(=O)O HJNGZRMNIZQFMR-UHFFFAOYSA-N 0.000 title 1
- 150000001875 compounds Chemical class 0.000 claims abstract description 30
- 239000000463 material Substances 0.000 claims abstract description 20
- FGDZQCVHDSGLHJ-UHFFFAOYSA-M rubidium chloride Chemical compound [Cl-].[Rb+] FGDZQCVHDSGLHJ-UHFFFAOYSA-M 0.000 claims abstract description 14
- 238000001027 hydrothermal synthesis Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 239000012153 distilled water Substances 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 3
- 238000011010 flushing procedure Methods 0.000 claims 1
- 238000004506 ultrasonic cleaning Methods 0.000 claims 1
- 229910015902 Bi 2 O 3 Inorganic materials 0.000 abstract description 6
- 230000005540 biological transmission Effects 0.000 abstract description 6
- 239000002994 raw material Substances 0.000 abstract description 2
- 239000000376 reactant Substances 0.000 abstract 1
- 238000001308 synthesis method Methods 0.000 abstract 1
- 239000002245 particle Substances 0.000 description 10
- 239000000843 powder Substances 0.000 description 9
- 235000019796 monopotassium phosphate Nutrition 0.000 description 6
- 125000004429 atom Chemical group 0.000 description 5
- 238000001228 spectrum Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004483 ATR-FTIR spectroscopy Methods 0.000 description 2
- 229910052797 bismuth Inorganic materials 0.000 description 2
- 230000007123 defense Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 229910000402 monopotassium phosphate Inorganic materials 0.000 description 2
- 125000004430 oxygen atom Chemical group O* 0.000 description 2
- PJNZPQUBCPKICU-UHFFFAOYSA-N phosphoric acid;potassium Chemical compound [K].OP(O)(O)=O PJNZPQUBCPKICU-UHFFFAOYSA-N 0.000 description 2
- RIUWBIIVUYSTCN-UHFFFAOYSA-N trilithium borate Chemical compound [Li+].[Li+].[Li+].[O-]B([O-])[O-] RIUWBIIVUYSTCN-UHFFFAOYSA-N 0.000 description 2
- 238000000584 ultraviolet--visible--near infrared spectrum Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 125000002346 iodo group Chemical group I* 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- WYOHGPUPVHHUGO-UHFFFAOYSA-K potassium;oxygen(2-);titanium(4+);phosphate Chemical compound [O-2].[K+].[Ti+4].[O-]P([O-])([O-])=O WYOHGPUPVHHUGO-UHFFFAOYSA-K 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 229910052701 rubidium Inorganic materials 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
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Abstract
本发明公开了一种无机晶体化合物Rb2BiI5O15及其制备方法和作为二阶非线性光学晶体材料的应用。该材料的突出特点是：首次以RbIO4、RbCl、Bi2O3和H5IO6为起始反应物，采用水热法进行制备；有较强的可相位匹配的二阶非线性光学效应；在可见光区和中红外光区有很大的透光窗口；具有较大的带隙和热稳定性；合成方法操作简单、原料利用率高、实验条件温和、产品纯度高；该晶体材料能广泛应用于光学领域。
The invention discloses an inorganic crystal compound Rb 2 BiI 5 O 15 , a preparation method thereof and an application as a second-order nonlinear optical crystal material. The outstanding features of this material are: for the first time, RbIO 4 , RbCl, Bi 2 O 3 and H 5 IO 6 are used as initial reactants to prepare by hydrothermal method; it has a strong second-order nonlinear optical effect that can be phase-matched ; There is a large light transmission window in the visible light region and the mid-infrared region; it has a large band gap and thermal stability; the synthesis method is simple to operate, the utilization rate of raw materials is high, the experimental conditions are mild, and the product purity is high; the crystal material can Widely used in the field of optics.
Description
技术领域 technical field
本发明涉及一种无机晶体化合物及其制备方法和应用，属于无机化学领域，也属于材料科学领域和光学领域。 The invention relates to an inorganic crystal compound and its preparation method and application, belonging to the field of inorganic chemistry, and also belongs to the field of material science and optics.
背景技术 Background technique
非线性光学效应起源于激光与介质的相互作用。当激光在具有非零二阶极化率的介质中传播时，会产生倍频、和频、差频、光参量放大等非线性光学效应。利用晶体的二阶非线性光学效应，可以制成二次谐波发生器、频率转换器、光学参量振荡器等非线性光学器件，在激光技术、大气监测和国防军事等众多领域，都有着重要的应用价值。无机非线性光学材料在二阶非线性光学材料的实用化研究中居主导地位。依据透光波段和适用范围，无机二阶非线性光学晶体材料可分为紫外光区非线性光学材料、可见光区非线性光学材料和红外光区非线性光学材料。目前已投入实用的紫外及可见光区的无机非线性光学材料有β-偏硼酸钡（BBO）、硼酸锂（LBO）、磷酸二氢钾（KDP）、磷酸钛氧钾（KTP）等，基本可以满足大多数实用的要求。但对于红外非线性光学材料来讲，离实用还有差距。原因在于现有的红外二阶非线性光学晶体材料，如AgGaS2、AgGaSe2和ZnGeP2等晶体，虽然具有很大的二阶非线性光学系数，在红外光区也有很宽的透过范围，但合成条件苛刻，不容易生长光学质量高的大单晶，特别是损伤阈值较低，因而不能满足二阶非线性光学晶体材料的实用化要求。而实现红外激光的频率转换又在国民经济、国防军事等领域有着重要的价值，如实现连续可调的分子光谱，拓宽激光辐射波长的范围，开辟新的激光光源等。因而寻找高激光损伤阈值的红外无机非线性光学材料的研究已成为当前非线性光学材料研究领域的一个重要课题。 Nonlinear optical effects originate from the interaction between laser and medium. When the laser propagates in a medium with non-zero second-order polarizability, nonlinear optical effects such as frequency doubling, sum frequency, difference frequency, and optical parametric amplification will occur. Using the second-order nonlinear optical effect of crystals, nonlinear optical devices such as second-harmonic generators, frequency converters, and optical parametric oscillators can be made, which are of great importance in many fields such as laser technology, atmospheric monitoring, and national defense. application value. Inorganic nonlinear optical materials play a dominant role in the practical research of second-order nonlinear optical materials. According to the light transmission band and scope of application, inorganic second-order nonlinear optical crystal materials can be divided into ultraviolet region nonlinear optical materials, visible light region nonlinear optical materials and infrared region nonlinear optical materials. At present, inorganic nonlinear optical materials in the ultraviolet and visible light regions that have been put into practical use include β-barium metaborate (BBO), lithium borate (LBO), potassium dihydrogen phosphate (KDP), potassium titanyl phosphate (KTP), etc., which can basically Meet most practical requirements. But for infrared nonlinear optical materials, there is still a gap from practicality. The reason is that the existing infrared second-order nonlinear optical crystal materials, such as AgGaS 2 , AgGaSe 2 and ZnGeP 2 crystals, have a large second-order nonlinear optical coefficient and have a wide transmission range in the infrared region. However, the synthesis conditions are harsh, and it is not easy to grow large single crystals with high optical quality, especially the damage threshold is low, so it cannot meet the practical requirements of second-order nonlinear optical crystal materials. The realization of infrared laser frequency conversion is of great value in the fields of national economy, national defense and military affairs, such as realizing continuously adjustable molecular spectrum, broadening the range of laser radiation wavelengths, and opening up new laser light sources. Therefore, the search for infrared inorganic nonlinear optical materials with high laser damage threshold has become an important topic in the field of nonlinear optical materials research.
发明内容 Contents of the invention
本发明的首要目的在于克服现有技术的缺点与不足，提供一种透光波段较宽、二阶非线性光学系数较大、能够实现相位匹配、容易制备且稳定性较好的无机晶体化合物及其制备方法。 The primary purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art, and provide an inorganic crystal compound with a wide light transmission band, a large second-order nonlinear optical coefficient, phase matching, easy preparation and good stability and its preparation method.
本发明的另一目的在于提供所述的无机晶体化合物作为二阶非线性光学晶体材料的应用。 Another object of the present invention is to provide the application of the inorganic crystal compound as a second-order nonlinear optical crystal material.
本发明的目的通过下述技术方案实现： The object of the present invention is achieved through the following technical solutions:
一种无机晶体化合物，分子式为Rb2BiI5O15。 An inorganic crystal compound with the molecular formula Rb 2 BiI 5 O 15 .
所述的无机晶体化合物，其晶体空间群为Abm2。 The crystal space group of the inorganic crystal compound is Abm2 .
一种制备所述无机晶体化合物的方法，包括以下步骤：将摩尔比为6：6~12：1~2：6~12的RbIO4、RbCl、Bi2O3和H5IO6加入水热反应釜内，再加入蒸馏水至RbIO4的最终浓度为2mol/L；将密闭的水热反应釜放入马弗炉内，加热至225-230°C，恒温反应4~6天再降温至室温；反应结束后，将产物置于超声清洗器中用蒸馏水洗涤，过滤，然后用乙醇冲洗，即得到无机晶体化合物Rb2BiI5O15。 A method for preparing the inorganic crystal compound, comprising the following steps: adding RbIO 4 , RbCl, Bi 2 O 3 and H 5 IO 6 with a molar ratio of 6:6~12:1~2:6~12 into hydrothermal In the reaction kettle, add distilled water until the final concentration of RbIO4 is 2mol/L; put the closed hydrothermal reaction kettle into the muffle furnace, heat it to 225-230°C, react at constant temperature for 4~6 days and then cool down to room temperature After the reaction, the product was placed in an ultrasonic cleaner, washed with distilled water, filtered, and then rinsed with ethanol to obtain the inorganic crystal compound Rb 2 BiI 5 O 15 .
所述的降温方式为自然降温或以2~6°C/h的速率降温。 Described mode of cooling is natural cooling or cooling with the rate of 2～6 ℃/h.
所述的无机晶体化合物作为二阶非线性光学晶体材料的应用。 The application of the inorganic crystal compound as a second-order nonlinear optical crystal material.
本发明制备Rb2BiI5O15的反应方程式如下所示： The reaction equation for preparing Rb 2 BiI 5 O 15 in the present invention is as follows:
RbIO4+RbCl+Bi2O3+H5IO6 Rb2BiI5O15 RbIO 4 +RbCl+Bi 2 O 3 +H 5 IO 6 Rb 2 BiI 5 O 15
本发明制得的无机晶体化合物具有以下优点和有益效果： The inorganic crystal compound prepared by the present invention has the following advantages and beneficial effects:
1.本发明制得的无机晶体化合物具有较大的倍频效应（SHG），Kurtz粉末倍频测试结果表明其粉末倍频效应大约为磷酸二氢钾（KDP）的3倍； 1. The inorganic crystalline compound prepared by the present invention has a relatively large SHG effect, and the Kurtz powder SHG test results show that the powder SHG effect is about 3 times that of potassium dihydrogen phosphate (KDP);
2.本发明制得的无机晶体化合物在可见光区和中红外光区有很宽的透过范围，粉末的红外透光范围达到12微米； 2. The inorganic crystal compound prepared by the present invention has a wide transmission range in the visible light region and the mid-infrared light region, and the infrared transmission range of the powder reaches 12 microns;
3.本发明制得的无机晶体化合物不含结晶水，对空气稳定，不潮解，且热稳定性较好，能够实现相位匹配； 3. The inorganic crystal compound prepared by the present invention does not contain crystal water, is stable to air, does not deliquesce, has good thermal stability, and can realize phase matching;
4.本发明利用水热制备法，具有操作简单、原料利用率高、实验条件温和以及产品纯度高等优点。 4. The present invention uses a hydrothermal preparation method, which has the advantages of simple operation, high utilization rate of raw materials, mild experimental conditions and high product purity.
附图说明 Description of drawings
图1为本发明Rb2BiI5O15的晶体结构图； Fig. 1 is the crystal structure diagram of Rb 2 BiI 5 O 15 of the present invention;
图2为本发明Rb2BiI5O15中[I3O9]3-桥的结构图； Fig. 2 is a structural diagram of [I 3 O 9 ] 3- bridge in Rb 2 BiI 5 O 15 of the present invention;
图3为本发明Rb2BiI5O15的固体粉末UV-Vis-NIR吸收谱图； Fig. 3 is the solid powder UV-Vis-NIR absorption spectrum of Rb 2 BiI 5 O 15 of the present invention;
图4为本发明Rb2BiI5O15的ATR-FTIR谱图； Fig. 4 is the ATR-FTIR spectrogram of Rb 2 BiI 5 O 15 of the present invention;
图5为本发明Rb2BiI5O15的热失重谱图； Fig. 5 is the thermogravimetric spectrum of Rb 2 BiI 5 O 15 of the present invention;
图6为本发明Rb2BiI5O15的SHG大小与颗粒度关系曲线图。 Fig. 6 is a graph showing the relationship between SHG size and particle size of Rb 2 BiI 5 O 15 in the present invention.
具体实施方式 detailed description
下面结合具体实施例及附图对本发明的技术方案作进一步详细的描述，但本发明的实施方式不限于此。 The technical solution of the present invention will be further described in detail below in conjunction with specific embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.
实施例1 Example 1
将6mmolRbIO4、6mmolRbCl、1mmolBi2O3和6mmolH5IO6加入23mL的水热反应釜内，再加入3mL蒸馏水使RBIO4的最终浓度为2mol/L；将密闭的水热反应釜放入马弗炉内，经3h加热至225°C，恒温反应4天再以2°C/h的降温速率降温至室温；反应结束后，将产物置于超声清洗器中用蒸馏水洗涤，过滤，然后用乙醇冲洗，即得到无色棒状晶体颗粒Rb2BiI5O15。 Add 6 mmol RbIO 4 , 6 mmol RbCl, 1 mmol Bi 2 O 3 and 6 mmol H 5 IO 6 into a 23 mL hydrothermal reactor, then add 3 mL of distilled water to make the final concentration of RBIO 4 2 mol/L; put the closed hydrothermal reactor into the muffle In the furnace, heat to 225°C for 3 hours, react at constant temperature for 4 days and then cool down to room temperature at a cooling rate of 2°C/h; after the reaction, wash the product in an ultrasonic cleaner with distilled water, filter, and then use Rinse to obtain colorless rod-shaped crystal particles Rb 2 BiI 5 O 15 .
实施例2 Example 2
将6mmolRbIO4、12mmolRbCl、1mmolBi2O3和6mmolH5IO6加入23mL的水热反应釜内，再加入3mL蒸馏水使RbIO4的最终浓度为2mol/L；将密闭的水热反应釜放入马弗炉内，经3h加热至230°C，恒温反应5天再以6°C/h的降温速率降温至室温；反应结束后，将产物置于超声清洗器中用蒸馏水洗涤，过滤，然后用乙醇冲洗，即得到无色棒状晶体颗粒Rb2BiI5O15。 Add 6 mmol RbIO 4 , 12 mmol RbCl, 1 mmol Bi 2 O 3 and 6 mmol H 5 IO 6 into a 23 mL hydrothermal reactor, then add 3 mL of distilled water to make the final concentration of RbIO 4 2 mol/L; put the closed hydrothermal reactor into the muffle In the furnace, heat to 230°C for 3 hours, react at constant temperature for 5 days and then cool down to room temperature at a cooling rate of 6°C/h; after the reaction, wash the product in an ultrasonic cleaner with distilled water, filter, and then use Rinse to obtain colorless rod-shaped crystal particles Rb 2 BiI 5 O 15 .
实施例3 Example 3
将6mmolRbIO4、6mmolRbCl、1mmolBi2O3和6mmolH5IO6加入23mL的水热反应釜内，再加入3mL蒸馏水使RbIO4的最终浓度为2mol/L；将密闭的水热反应釜放入马弗炉内，经3h加热至228°C，恒温反应6天再自然降温至室温；反应结束后，将产物置于超声清洗器中用蒸馏水洗涤，过滤，然后用乙醇冲洗，即得到无色棒状晶体颗粒Rb2BiI5O15。 Add 6 mmol RbIO 4 , 6 mmol RbCl, 1 mmol Bi 2 O 3 and 6 mmol H 5 IO 6 into a 23 mL hydrothermal reactor, then add 3 mL of distilled water to make the final concentration of RbIO 4 2 mol/L; put the closed hydrothermal reactor into the muffle In the furnace, heated to 228°C for 3 hours, reacted at constant temperature for 6 days and then cooled down to room temperature naturally; after the reaction, the product was washed in an ultrasonic cleaner with distilled water, filtered, and then rinsed with ethanol to obtain colorless rod-shaped crystals Particle Rb 2 BiI 5 O 15 .
本发明所制备的无机晶体化合物的倍频性能通过Kurtz粉末倍频测试方法获得。具体操作步骤如下：将所得的无色棒状晶体颗粒首先研磨成粒度为100～125微米的粉末，然后装入两面有玻璃窗的样品池内，之后将样品池置于Nd:YAG脉冲激光器作为光源的激光光路中，利用波长为1064纳米的基频光照射样品池，将粒度约为100微米的KDP单晶粉末作为标样，信号经光电倍增管显示于示波器上。 The frequency doubling performance of the inorganic crystal compound prepared in the present invention is obtained by the Kurtz powder frequency doubling test method. The specific operation steps are as follows: the obtained colorless rod-shaped crystal particles are first ground into a powder with a particle size of 100-125 microns, and then put into a sample cell with glass windows on both sides, and then the sample cell is placed in a Nd:YAG pulsed laser as a light source. In the laser light path, the sample cell is irradiated with fundamental frequency light with a wavelength of 1064 nanometers, and the KDP single crystal powder with a particle size of about 100 microns is used as a standard sample, and the signal is displayed on the oscilloscope through a photomultiplier tube.
本发明所制备的无机晶体化合物相位匹配测试：将所得的无机晶体化合物首先分别研磨并筛分成不同粒度范围的粉末（20～40，40～60，60～80，80～100，100～125，125～150，150～200，200～300，300～400，400～500微米），然后装入两面有玻璃窗的样品池内，之后将样品池置于Nd:YAG脉冲激光器作为光源的激光光路中，利用波长为1064纳米的基频光照射样品池，将粒度约为100微米的KDP单晶粉末作为标样，信号经光电倍增管显示于示波器上。 The phase matching test of the inorganic crystal compound prepared by the present invention: the obtained inorganic crystal compound is first ground and sieved into powders with different particle size ranges (20-40, 40-60, 60-80, 80-100, 100-125, 125 ~ 150, 150 ~ 200, 200 ~ 300, 300 ~ 400, 400 ~ 500 microns), and then put it into the sample cell with glass windows on both sides, and then put the sample cell in the laser light path of the Nd:YAG pulsed laser as the light source , using fundamental frequency light with a wavelength of 1064 nanometers to irradiate the sample cell, using KDP single crystal powder with a particle size of about 100 microns as a standard sample, and the signal is displayed on the oscilloscope through a photomultiplier tube.
所得的无机晶体化合物经过X-射线单晶结构测定，其分子式为Rb2BiI5O15，空间群为Abm2；晶胞参数为a=8.2257(6)?，b=23.5398(18)?，c=8.2544(6)?，α=β=γ=90.00°；其结构排列如图1所示。图2为该化合物结构中一种新型的[I3O9]3-桥的结构图。该无机晶体化合物的UV-Vis-NIR吸收谱图如图3所示，其ATR-FTIR谱图如图4所示，该无机晶体化合物具有较大的光学带隙，约为3.53eV；粉末的红外吸收边可达12微米，其热失重谱图如图5所示，该无机晶体化合物在450°C以后才开始失重，因此具有较好的热稳定性。其SHG大小与颗粒度关系曲线的测试结果如图6所示，表明该化合物是可以实现相位匹配的。 The obtained inorganic crystal compound has been determined by X-ray single crystal structure, and its molecular formula is Rb 2 BiI 5 O 15 , the space group is Abm2 ; the unit cell parameters are a=8.2257(6)?, b=23.5398(18)?, c =8.2544(6)?, α=β=γ=90.00°; its structure arrangement is shown in Figure 1. Figure 2 is a structural diagram of a novel [I 3 O 9 ] 3- bridge in the compound structure. The UV-Vis-NIR absorption spectrum of this inorganic crystal compound is as shown in Figure 3, and its ATR-FTIR spectrum is as shown in Figure 4, and this inorganic crystal compound has a larger optical band gap, about 3.53eV; The infrared absorption edge can reach 12 microns, and its thermal weight loss spectrum is shown in Figure 5. The inorganic crystal compound begins to lose weight after 450°C, so it has good thermal stability. The test results of the relationship curve between SHG size and particle size are shown in Figure 6, which shows that the compound can achieve phase matching.
本发明所制备的化合物Rb2BiI5O15的晶体结构中含有两个独立的Rb原子，一个独立的Bi原子，三个独立的I原子和八个独立的O原子。其中，每一个Rb原子和Bi原子都分别与八个O原子形成畸变的八面体构型；相邻的两个BiO8八面体通过O2原子相互连接，沿着C轴方向形成链状结构；而每两条相邻的BiO8链状结构之间通过一种新型的[I3O9]3-桥连接起来，这种新型的[I3O9]3-桥状结构在之前的碘酸盐系列化合物中从未出现过，它是由两个顶端的[I(1)O3]-和中间的一个[I(3)O3]-通过O7桥连起来的。该[I3O9]3-桥是一种非中心对称的结构，可以产生一个微观的偶极矩，有趣的是，每个[I3O9]3-桥都沿着C轴有规律地排列，因此这些微观的偶极矩可以有效地相互叠加，从而在C轴方向产生一个不为零的偶极矩。这种独特的排列方式使得该化合物在宏观上表现出较强的非线性光学效应。 The crystal structure of the compound Rb 2 BiI 5 O 15 prepared in the present invention contains two independent Rb atoms, one independent Bi atom, three independent I atoms and eight independent O atoms. Among them, each Rb atom and Bi atom form a distorted octahedral configuration with eight O atoms respectively; two adjacent BiO 8 octahedra are connected to each other through O2 atoms, forming a chain structure along the C-axis direction; and Every two adjacent BiO 8 chain structures are connected by a new type of [I 3 O 9 ] 3- bridge, and this new type of [I 3 O 9 ] 3- bridge structure is It has never appeared in the salt series compounds. It is connected by two top [I(1)O 3 ] - and the middle one [I(3)O 3 ] - through O7 bridge. The [I 3 O 9 ] 3- bridge is a non-centrosymmetric structure that can generate a microscopic dipole moment. Interestingly, each [I 3 O 9 ] 3- bridge has regular so that these microscopic dipole moments can effectively superimpose each other to generate a non-zero dipole moment in the direction of the C-axis. This unique arrangement makes the compound exhibit a strong nonlinear optical effect macroscopically.
总之，它具有优良的综合性能，可作为二阶非线性光学晶体材料加以应用。 In short, it has excellent comprehensive properties and can be applied as a second-order nonlinear optical crystal material.
上面结合附图对本发明的实施方式作了详细说明，但是本发明并不限于所述实施方式，可在本领域的普通技术人员所具备的知识范围内，还可以在不脱离本发明宗旨的前提下做出各种变化。 The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the embodiments, and can be within the scope of the knowledge of those of ordinary skill in the art, and without departing from the gist of the present invention. Make various changes below.
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