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  • 短长度的双椭圆纤芯光子晶体光纤偏振分束器 基于双折射效应设计了一种新型的双椭圆纤芯光子晶体光纤(PCF)偏振分束器,通过在每个纤芯处引入一对大空气孔和一对小空气孔来构成椭圆纤芯。采用全矢量有限元法(FEM)和半矢量光束传播法数值模拟偏振分束器的性能,结果表明,在工作波长1.55 μm处,光纤长度为544 μm时,X、Y方向偏振光可实现分离,且消光比达到-43.75 dB,消光比小于-10 dB的带宽为80 nm。这为设计具有高消光比和极短长度的双芯光子晶体光纤偏振分束器提供了一种新的结构。
  • Modeling and optimal design of sensor for capacitively coupled e... ... coupled ERT (CCERT). A 2D mathematical model of CCERT is developed and the simulation program is designed by Finite Element Method (FEM). Then, the influence of three main parameters (the permittivity of the pipe wall, the thickness of the pipe wall and ...
  • High-Curie-temperature relaxor piezoelectric single crystals for... ... . The experiment and finite element analysis with the PZFlex package software were developed to design and optimize the 1.5D transducer. The FEM results show that the -6 dB fractional bandwidth is up to 83% using two lambda/3.75 matching layers. A 6
  • Simulation of Brillouin gain properties in a double-clad As2Se3 ... ... gain properties in a double-clad As2Se3 photonic crystal fiber (PCF) are simulated based on the finite-element method (FEM). The results indicate that the Brillouin gain spectrum (BGS) of our proposed chalcogenide PCF exhibits a multipeaked behavior and ...
  • 保偏空芯带隙光子晶体光纤温度特性研究 提出了一种具有良好保偏(PM)特性的空芯带隙光子晶体光纤(PBF)结构,利用全矢量有限元方法(FEM)对光纤有效折射率、拍长及限制损耗特性受温度波动的影响进行了研究。研究结果表明,在1.55 μm 波长处,该PBF 的双折射高达6.19×10
  • 高精度光学平板在三点支撑下自重变形的研究 影响高精度光学元件重要的因素之一是支撑结构。主要研究了在三点支撑下,自重变形量与口径和厚度的关系。采用数值分析、有限元法(FEM)模型与实验验证相结合的方法完成对三点支撑下自重变形量的研究。采用薄板理论推导了在三点支撑下,重力变形与口径、厚度的关系;采用有限元法分析了一系列不同厚度、不同口径的平面镜自重变形大小;利用实验验证了模型的正确性。在薄板理论模型基础上,完善了自重变形与不同材料、口径、厚度、形状的变形函数,为快速计算出三点支撑下的自重变形提供理论依据。
  • 一种精确的同轴封装DFB激光器组件的热学模型 基于有限元方法(FEM)建立了精确的同轴封装无致冷分布反馈布拉格(DFB)激光器发射组件(TOSA)的热分析模型。对TOSA的热场分布和结温进行模拟和分析,并通过实验验证热学模型的正确性。利用极窄 ... 定量关系式。通过实测得到激光器的结温、晶体管形(TO)封装管壳的壳温与热功耗的关系曲线,并同时对不同热功耗下的激光器结温和TO封装管壳的壳温进行模拟,FEM模拟的结果与实测结果十分吻合。根据实测的温度梯度求得激光器组件在不同环境温度下的热阻。所建立的热学模型具有较高的精确性,可以用于TOSA及光收发模块的散热设计 ...
  • Octagonal dual-concentric-core photonic crystal fiber for C-band... A novel kind of octagonal dual-concentric-core photonic crystal fiber (PCF) is calculated with the finite element method (FEM) and proposed for broadband compensation. In order to realize highly negative dispersion, the hole diameter of the second ring is ...
  • Spectroscopic Study of Ne Clusters Irradiated by an Intense, Fem... X-ray emission (4~18 nm) from small-sized Ne clusters heated by high-intensity, 25~100 fs laser pulses is spectroscopically inverstigated. The Ne spectrum started to drastically change in emitting ions from Ne5+ to Ne7+ below the pre-expansion ...
  • 193 nm光刻投影物镜单镜支撑仿真分析及实验研究 ... 中最为关键的工艺,光刻的分辨力主要取决于光刻投影物镜的光学性能。光刻投影物镜光学元件面形精度为纳米量级,其对光学元件的加工及物镜单镜支撑提出了极高的要求。为193 nm光刻投影物镜高精度的单镜面形,设计了一种运动学单镜支撑结构。运用有限元法(FEM)分析光刻投影物镜单镜运动学支撑结构在重力下物镜镜片的面形变化量,经分析物镜镜片的峰值(PV)值为15.46 nm,均方根(RMS)误差为3.62 nm。为了验证有限元计算精度,建立了可去除参考面面形及被测面原始面形的方法。经过分析对比,仿真结果与实验结果面形 ...