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1.
DR1掺杂复合凝胶玻璃光学二阶非线性效应的研究   总被引:3,自引:1,他引:2       下载免费PDF全文
对分散红1(disperse red 1,缩写为DR1)掺杂聚甲基丙烯酸甲酯(PMMA)/凝胶玻璃复合材料的光学二阶非线性及其热稳定性进行了研究.分析了实时极化二次谐波产生(SHG)的动态过程及影响光学二阶非线性的因素.同时对影响DR1掺杂复合凝胶玻璃材料的光学二阶非线性强度的因素进行了分析. 关键词:  相似文献   

2.
聚对苯撑亚乙烯/SiO2块状溶胶-凝胶非线性光学材料的研究   总被引:2,自引:0,他引:2  
我们制作了一种由π-共轭聚合物聚对苯撑亚乙烯(PPV)均匀掺杂SiO2的块状溶胶-凝胶材料,该材料具有良好的光学品质和光学加工性能。通过扫描隧道显微镜(STM),紫外-可见吸收光谱和付氏红外光谱(FTIR)等方法研究了它的非线性光学特性。在对材料进行的光学两波耦合实验中,观察到了非对称能量耦合现象,并对此进行了分析。从吸光度和两波耦合衍射效率两方面对比了含PMMA和不含PMMA的两批不同掺杂浓度的PPV/SiO2 sol-gel材料的不同特性。  相似文献   

3.
选择、设计具有代表性无取代酞菁镍(NiPc)和周环带有4个磺酸基的四磺化酞菁镍(NiTSPc),采用溶胶-凝胶湿化学将其均匀掺入SiO2凝胶基质,制备无机基质酞菁掺杂复合光功能材料并考察磺酸基的引入对掺杂酞菁在溶胶-凝胶复合体系中UV/Vis吸收光谱的影响。研究结果表明水溶性磺酸基的引入有助于改善酞菁的溶解性,进而实现其与溶胶-凝胶体系的稳定互溶,使酞菁均匀掺杂复合材料的制备成为可能。  相似文献   

4.
本文首次报道了对采用溶胶凝胶和原位生长工艺制备的Cd_xHg_(1-x)Te/SiO_2固溶体微品掺杂玻璃进行的三阶非线性光学性质实验研究及其结果。利用回返式简并四波混频技术,测得该固溶体掺杂玻璃的三阶非线性极化率的值为10 ̄(-12)esu量级。此结果比纯SiO_2基体提高了2个数量级。表明该固溶体掺杂玻璃三阶非线性明显增强,在同样条件下,测得CS_2的三阶非线性极化率x(3)为(1.7±0.2)×10 ̄(-12)esu,与国际上报道完全一致。  相似文献   

5.
对有机染料4-Dieyanomethylene-2-methjyl-6-(p-dimethylaminostyryl)-4H-pyran(DCM)掺杂的PMMA(聚甲基丙烯酸甲酯)以及DCM掺杂的PMMA/凝胶玻璃复合材料平面光波导中的放大自发辐射进行了研究。实验表明,通过合理地控制波导层的折射率及厚度,可以在较宽范围内选择放大自发辐射的波长,从而实现波长调谐,波长调谐范围可达30nm。该方法可应用于固体可调谐激光器及光放大器的宽带调谐。  相似文献   

6.
实现酞菁材料化进而器件化的一个重要途径是将其引入到固相基质制备酞菁掺杂的复合材料.文章以邻苯二腈和可溶性镍盐为反应试剂,通过一定温度的热处理,采用原位合成技术在二氧化硅凝胶玻璃基质中原位合成镍酞菁,制备了复合凝胶玻璃材料,并用紫外一可见吸收光谱表征了其制备过程.由于镍酞菁在可见光区域有明显吸收,以镍酞菁物理掺杂的复合凝胶玻璃作为参照,用670 nm处的吸光度来计算原位合成镍酞菁的量.研究了原位合成动力学,拟合出原位合成NiPc的量与加热时间的关系曲线.拟合曲线呈"S"形,与Avrami-Erofeev公式相符.由此推导出在180,185,190,195和200℃时的反应级数分别是4.5,4.5,3.7,3.2,1.9.  相似文献   

7.
采用实时光学二次谐波产生(SHG)测量方法,以两亲性分子半花菁为掺杂探针分子,对溶胶-凝胶技术制备的玻璃薄膜的凝胶干燥的动态过程进行了研究.结合紫外—可见吸收光谱的测量,发现:因两亲性分子在膜中的自取向性可诱导出二阶光学非线性,溶胶-凝胶技术制备的有机/无机复合膜的凝胶干燥过程可通过薄膜SHG强度的变化半定量地反映.凝胶干燥收缩导致有序掺杂分子数减少,膜片的光学非线性减弱.该过程随薄膜处理温度的升高而急剧缩短;另外,有机分子在膜中的聚集程度随膜片处理温度的增加而很快减少. 关键词:  相似文献   

8.
采用新型的热化学还原法,制备了银纳米颗粒掺杂的铋酸盐复合玻璃材料。利用紫外-可见吸收光谱观察到了银纳米颗粒表面等离子谐振(SPR)吸收的峰值位移特性,用拉曼光谱表征了引入银纳米颗粒后玻璃的结构变化。借助飞秒激光脉冲激发下的Z扫描与光克尔闸技术,在近红外波段下研究了材料的三阶非线性光学特性。研究结果表明银纳米颗粒铋酸盐复合材料有着亚皮秒级的非线性响应时间,并且其非线性折射率γ在纳米颗粒的热电子效应以及局部场效应的影响下,较基质玻璃最高可以提升29倍。  相似文献   

9.
孙悦  曲斌  全保刚 《物理学报》2018,67(23):236201-236201
MoSe2的禁带宽度较窄(1.1–1.5 eV),且具有可调谐的激子光电效应,这样使其在光致发光、光电晶体管、太阳能电池和光学非线性等方面具有潜在的应用价值.然而,纯的MoSe2的光生电子空穴复合率较高,限制了其在某些光学领域中的应用.通过设计MoSe2的复合材料,可以降低材料的光生电子空穴复合率,从而扩展其应用领域.首先,通过热溶剂法合成CNT/MoSe2复合材料;然后,通过浇铸法将其分散在甲基丙烯酸甲酯(MMA)中制备成有机玻璃,其中MMA会聚合成聚甲基丙烯酸甲酯(PMMA),并利用改进的Z-扫描技术首次对CNT/MoSe2/PMMA有机玻璃的非线性吸收、非线性散射和光限幅特性进行了研究.研究表明,随着输入能量的变化,通过调节输入能量,CNT/MoSe2/PMMA有机玻璃表现出饱和吸收(SA)和从SA到反饱和吸收的转变.结合材料特性及应用条件要求,可以得到CNT/MoSe2/PMMA有机玻璃在光学设备,如光学限制器和锁模/调Q激光器等方向具有较好的应用前景.  相似文献   

10.
ICF靶材料和靶制备技术研究进展   总被引:9,自引:4,他引:5       下载免费PDF全文
 主要介绍了中国工程物理研究院ICF靶材料科学与靶制备技术在材料研究、靶丸制备技术、薄膜制备技术、精密微工艺及靶参数测量等方面的主要研究进展。在靶材料研究方面,近年相继研制成功全氘代聚苯乙烯(D-PS)有机材料、微靶掺杂和激光吸收与X射线转换金属纳米或团簇材料;探索了新型有机气凝胶储氢材料,开展了金属小团簇理论研究和纳米金属复合材料的研究工作。在靶制备技术与工艺方面,完成了PS单层、双层和三层塑料空心微球的研制工作;利用低温等离子体聚合涂层技术,建立了微球表面沉积纯CH薄膜以及金属掺杂CH薄膜的工艺和技术;在玻璃微球充氩技术研究中,开展了原子力扫描显微镜对玻璃球壳钻孔工艺研究以及粒子辐照改性充气技术研究,等等。  相似文献   

11.
Fozia Z. Haque  Vazid Ali  M. Husain 《Optik》2012,123(11):1010-1014
The work was carried out to achieve two different but interdependent objectives; one to synthesis a transparent silica matrix with enough strength and thermal stability, by sol–gel technique, to host an organic dye molecule without quenching its fluorescence and two to find the probability if the said material is suitable for the construction of solid state dye lasers. Crack-free transparent silica gel rods with good mechanical strength, thermal stability and dimensions were successfully synthesized by sol–gel techniques. The rods were doped with Kiton Red-620 dye in different concentration separately. Effect of various synthesis parameters like time, temperature and aging condition was extensively studied to obtain crack-free silica rods doped with dye. Optical properties of prepared rods were studied by FTIR, UV/VIS–NIR and fluorescence spectroscopy. It is observed that Kiton Red-620 dye doped silica gel rods show good fluorescence with sharp peaks in the visible range. Their UV–VIS spectrum indicates the absorption in visible range. Thermal stability of rods were studied by DSC/TGA methods. Eventually it is found that these dye doped silica gel materials explore the possibility for new solid-state dye laser materials.  相似文献   

12.
Xu L  Hou Z  Liu L  Xu Z  Wang W  Li F  Ye M 《Optics letters》1999,24(19):1364-1366
The optical nonlinearity of organic dye-doped poly(methyl methacrylate) (PMMA)-silica-gel hybrid material was investigated by second-harmonic-generation measurement. We found that incorporation of in situ polymerized solgel precursors into the organic dye-doped PMMA significantly improved the nonlinear optical stability of the system. However, improvement of thermal stability occurred only when a sufficient amount of silica gel was incorporated. A structural phase transition from pure polymer to a hybrid system was found near a 10-mol.% silica-gel concentration. The optimum polymer/tetraethoxysilane molar ratio is 2:1 to 1:1.  相似文献   

13.
The proton-conducting gel electrolytes based on poly(methyl methacrylate) (PMMA) doped by acid solutions in aprotic solvents were synthesized and discussed in this work. The gel conductivity as a function on concentrations of acid and polymer as well as of molecular mass of PMMA has been analyzed. The thermal stability of electrolytes was estimated and discussed. Extreme dependence of the conductivity on concentration is found to be for the gel (at a concentration of PMMA from 5 to 15 wt.%). The increase of electrical conductivity in the concentration range from 5 to 10 wt.% of PMMA with an increase in viscosity of the system is discussed as an indication of an involvement of the polymer matrix in increasing the mobility of the charge carriers in frame of Grotthuss mechanism.  相似文献   

14.
The third order nonlinear optical properties of Rhodamine6G (Rh6G) doped silica and polymeric samples have been investigated using single beam z-scan technique under excitation by the second harmonic of Nd:YAG laser beam (532 nm). The nonlinear refractive index, nonlinear absorption coefficient, real and imaginary parts of third order nonlinear susceptibility in the samples of silica and poly-methylmethacrylate (PMMA) matrices are measured. Thermal contribution to the nonlinear refractive index in case of undoped silica samples has been calculated in order to have better accuracy of the material response contribution to third order nonlinearity. The comparative study of the optical limiting performance of Rh6G doped silica and polymeric samples show that Rh6G doped silica is relatively superior for optical limiting applications.  相似文献   

15.
纳米碳管复合凝胶玻璃结构及谱学性能研究   总被引:1,自引:1,他引:0  
用物理掺杂工艺将纳米碳管引入二氧化硅凝胶玻璃基质, 成功制备了纳米碳管复合凝胶玻璃, 采用X射线衍射、透射电子显微镜、紫外-可见吸收光谱、红外光谱、拉曼光谱等测试方法对其结构和谱学性能进行了表征. 结果表明, 通过优化掺杂工艺能够实现纳米碳管与基质的均匀复合, 纳米碳管本身的结构在掺杂过程中并未发生改变. 纳米碳管的引入对二氧化硅凝胶玻璃基质的紫外-可见吸收光谱和红外光谱未产生显著影响.  相似文献   

16.
溶胶凝胶法制备PMMA/SiO2杂化材料   总被引:2,自引:0,他引:2       下载免费PDF全文
 针对目前PMMA/SiO2杂化材料制备过程中容易出现的相分离问题,采用原位聚合和同步溶胶凝胶过程制备了聚合物链段与无机组分间有化学键作用的PMMA/SiO2杂化材料,并应用透射电子显微镜、红外光谱分析仪、X射线衍射分析仪、热失重分析仪等对不同SiO2含量的PMMA/SiO2杂化材料的形貌及结构进行了研究。结果表明:SiO2含量在20%~60%间的PMMA/SiO2杂化体系没有明显的相分离现象,SiO2含量在20%~40%间的杂化体系的透光性较好。  相似文献   

17.
Imidazolium-based metal and halogen-free Brönsted acidic ionic liquid (BAIL) (3,3′-(hexane-1,6-diyl)bis(2-methyl-1-(3-sulfopropyl)-1H-benzimidazolium) hydrogensulfate [HbMBIM-PS][HSO4] was synthesized. The physicochemical properties of this BAIL were investigated using a variety of different analytical and spectroscopic techniques such as 1H and13C-NMR, FT-IR, mass, UV–vis and TGA spectra. A porous silica matrix has been synthesized using BAIL and tetraethoxysilane (TEOS) as silica source by nonhydrolytic sol–gel method. The properties of IL confined silica gel matrix have been studied using FTIR, TGA, SEM, N2-sorption measurement (BET characterization for determining pore parameters), and NH3-TPD techniques. From the N2-sorption measurement, it has been found that BET surface area decreased while pore volume, average pore size and porosity decreased. The thermal stability of the IL has been found to increase upon confinement in silica gel matrix. The results suggested that IL had been successfully confined on silica gel. This IL confined silica gel catalyst is environment friendly and useful for alkane isomerization and esterification reactions.  相似文献   

18.
对6-(4-((4-(十八烷氧基-)苯基)二氮烯基)苯氧基)-1-己醇(E-1-ol)的光致变色、双折射和全息光存储特性进行了研究.以488 nm的氩离子(Ar+)激光为抽运光,632.8 nm 的氦氖(He-Ne)激光为探测光,研究了透射信号强度随时间的变化关系;在10 mW~160 mW的范围内,研究了透射信号强度的最大值随抽运光功率的变化;经计算,在各抽运光功率下,获得的光致双折射值(δn)达10-2量级,最大激光功率下,获得的δn为2.8×10-2.对透射信号强度随时间的变化曲线进行了理论拟合,得出曲线的上升和下降符合双指数增长和衰减,时间响应常量分别是:上升阶段:t1=4.8 s,t2=85.8 s;下降阶段:t1=1.9 s,t2=27.6 s.用等强度s偏振的两束Ar+激光为写入光, He-Ne光为读出光,研究了衍射信号强度随时间的变化及写入光功率改变时,衍射信号强度最大值与写入光功率的变化关系;对衍射信号强度随时间变化的动力学过程进行了理论拟合,得出光栅生长和衰减也有快和慢两个过程,光栅生长时间响应常量为:t1=3.9 s,t2=33.9 s,光栅衰减时间响应常量为 t1=1.8 s,t2=60.1 s.  相似文献   

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