共查询到19条相似文献,搜索用时 62 毫秒
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采用热极化技术对掺锗玻璃条形光波导进行极化,通过光纤连接 (单模) 的Mach Zehnder Interferometer 系统测量条形波导内诱导出的电光效应,系统地研究了大气环境下极化条件(极化温度、极化时间、极化电压)对电光效应的影响.结果表明:在最佳极化条件下(406℃、-2.4 kV、20 min),波导内的电光系数为rTM=0.059±0.001 pm/V, rTE=0.053±0.001 pm/V,且波导结构中存在一个较低的阈值极化电压(100 V)和阈值极化温度(80℃),此时在波导样品内仍能被激发出可观察的电光效应;实验还发现采用负极化诱导方式产生的电光系数较正极化提高15%左右. 相似文献
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通过理论模拟对具有上覆盖层的SiO2脊形条波导结构进行了优化,在此基础上利用微电子工艺制作了SiO2脊形波导Mach-Zehnder型电光调制器,并进行热极化引起的电光和非线性效应的研究.热极化过程大幅增强了样品的电光及非线性效应,二次电光系数由热极化前的1.56×10-22(m/V)2提高到热极化后的8.50×10-22(m/V)2,极化后得到了0.093pm/V的线性电光系数,对热极化的物理机理进行了理论分析.
关键词:
电光调制器
2光波导')" href="#">SiO2光波导
电光效应
热极化 相似文献
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金属包覆极化聚合物光波导的优化设计 总被引:2,自引:0,他引:2
按极化聚合物光波导器件的五层(金属-缓冲层-波导层-缓冲层-金属)对称模型,对于其金属包覆层的光学吸收所引起的光波传播损耗进行了理论分析和计算,给出了在单模条件下波导层和缓冲层折射率及其厚度之间的关系曲线,计算确定出单模极化聚合物光波导参数。 相似文献
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本文采用干银膜离子交换方法,在硅酸盐玻璃表面实现Ag^ -Na^2 离子交换,形成高折射率层,制备出低损耗平面光波导,为玻璃光波导制备提供新的有效技术途径。 相似文献
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Jamshid Khorsandi Shahnawaz 《International Journal of Infrared and Millimeter Waves》2005,26(9):1317-1328
A novel realization of non-uniform semivectorial finite difference method for the analysis of semiconductor optical waveguides is presented. By using non-uniform mesh structure computer time is saved while the accuracy is maintained. Also, the accuracy of the results increased by balancing the coefficient matrix without increasing computation time. Calculation of all eigenvalues (real and complex) is enabled by the method. The results of the calculation are compared for uniform and non-uniform methods and for two different optical waveguides. It is indicated that accuracy of the result is mainly dependent on the mesh refinement near the material interfaces. It is also indicated that for small mesh size using non-uniform method is necessary while uniform method is useless due to huge computer time and memory needed. 相似文献
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理论模拟了激光束通过磁流体样品后产生的远场光斑图样,提出了一种阈值可调光学限幅器的实现方案.计算了不同光阑孔径半径和不同光阑样品距离情况下,系统的出射光功率与入射光功率的关系.得出了系统的光学限幅阈值随光阑孔径半径的增大以及光阑样品距离的减小而向高功率方向转移的结论,且限幅阈值与光阑孔径半径之间呈线性关系.定义了描述磁流体样品特征的参量f,发现了系统的光学限幅阈值随f的绝对值增加而减小.本文的结论能为实际的磁流体基可调谐光学限幅器的设计与制作提供有益的参考. 相似文献
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We report a non-linear blue shift of the zero-phonon emission line 5D0→7F0 of Eu3+-dopant in Eu3+-doped nano-glass-ceramics in magnetic field up to 50 T. The shift is significantly larger in nano-glass-ceramics compared to its precursor glass, suggesting that the nanoceraming of the precursor glass decreases the effective mass of the f-electrons bands of Eu3+ resulting in their enhanced magnetic confinement. Moreover, the non-linear character of the magnetic field dependence of this blue energy shift denotes a spatial confinement of f-electrons wave-functions of Eu3+ dopants in the PbF2-based nanocrystals of the nano-glass-ceramics where up to 90% of the dopants partition. The spatial confinement seems to be due to an admixture to the f-states of Eu3+ of its higher lying states of opposite parity which fall in the quantum well comprising of Eu3+-doped PbF2 crystalline nanoparticles embedded in the surrounding glass network. 相似文献
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采用空间综合辐照模拟设备研究了真空紫外辐照对MQ增强加成型硅橡胶的表面形貌、质量损失、热性能及光学性能的影响。试验结果表明:真空紫外辐照后,硅橡胶表面出现损伤裂纹,随辐照剂量的增加,裂纹的数量增多;真空紫外辐照后,硅橡胶的质量有所损失,其质损率随辐照剂量的增加而增加;真空紫外辐照后硅橡胶的耐热性随辐照剂量的增加先增加而后下降;真空紫外辐照对硅橡胶材料的体膨胀/收缩变形影响不大,但对材料的光学性能有较大影响,随着辐照剂量的增加,材料的光学透过率下降。 相似文献
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S. Ju P. R. Watekar Y.-T. Ryu Y. Lee S. G. Kang Y. Kim 《Fiber and Integrated Optics》2013,32(4):191-207
ABSTRACTThe effect of glass composition, pure silica glass, boron-doped and fluorine-doped silica glasses of inner cladding, in the germano-silicate glass core fibers on optical and mechanical properties upon the γ-ray irradiation was investigated. Enhanced radiation hardening at 1,550 nm was found in both the B- and F-doped fibers after the γ-ray irradiation with dose-rate of 1.25 kGy/h. The radiation-induced attenuation (RIA) was found to increase in the order of the B-doped fiber, the F-doped fiber, and the silica fiber. While no major influence on the refractive index of the fibers after the γ-ray irradiation was found, the residual stress was slightly changed. 相似文献
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粗糙热传导表面下激光介质的热效应 总被引:1,自引:0,他引:1
在考虑激光介质与热沉不完全接触导热的情况下,用面热源自适应调整算法计算了激光介质的温度场,研究了其热效应.表面附近相位差存在起伏且深入一定深度使热效应复杂化.随抽运功率的增大,表面附近相位差的起伏增强,而起伏深度变化不明显;接触面积增大,相位差起伏减小,起伏的深度有所减小.抽运功率较小时,热致衍射损耗随抽运功率的增大近似线性增大,高斯光半径越大,增大的斜率越大,当抽运功率增加到一定程度时,热致衍射损耗增大的趋势减缓,半径大的减缓较明显.在抽运光功率变化范围内,半径大的高斯光热致衍射损耗大于半径小的.高斯光半径较小时,接触面积对热致衍射损耗的影响不明显,当高斯光半径较大时,接触面积减小热致衍射损耗增大. 相似文献
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S.R. Luki? D.M. Petrovi? G.R. Štrbac A.F. Petrovi? M. Šiljegovi? 《Journal of Physics and Chemistry of Solids》2005,66(10):1683-1686
The paper presents results of the research carried out with the aim of establishing the effect of sulfur atom substitute with selenium on thermal and chemical stability of glasses of the Ge20As14SxSe52-xI14 type.Chemical stability of glasses was estimated on the basis of their dissolution rate in potassium hydroxide of different concentrations. It was found that the rate of dissolving in KOH solutions increases with the increase of the percentage of sulfur content in the glass. The dissolving rate also depends on concentration of basic solution. It was found that the functional dependence of the rate of their dissolution could be described by an exponential function.Values of the glass transition point, as well as the temperature of the beginning of thermomechanical deformation were determined by the methods of thermomechanical analysis.It was established that characteristic temperatures increase insignificantly as sulfur content increases in investigated system. 相似文献