一种应用于波分复用无源光网络系统中的滤波片-PIN-TIA阵列光接收组件

设计并实现了一种将密集波分复用(DWDM)薄膜滤波片与光电探测器PIN以及前置放大器TIA集成封装的光接收组件。通过创新设计单模光纤双芯插针和自聚焦透镜的结构,解决了透过密集波分复用滤波片后的反射光偏离轴线带来的耦合问题。并基于该组件实现了32个密集波分复用通道的解复用与信号检测同时完成的波分复用无源光网络(WDM-PON)系统中上行信道阵列接收模块。测试表明模块满足国际电信联盟(ITU-T)中心波长,最小插入损耗为0.3 dB,最大插入损耗为6 dB,响应速率为100 Mbit/s~1.25 Gbit/s。     

Nonspherical LED packaging lens for uniformity improvement

Light emitting diode (LED) has more advantages compared with a traditional incandescent light bulb and a fluorescent lamp, such as small size, low quantity of heat, long life, low power consumption, fast response, plain packaging and ease of develop ment of a frivolous short product. A methodology is proposed to improve the uniformity of the LED illumination system. As a light source in a backlight unit (BLU), the requirement for optical characteristics of a LED is different from highly directional conventional ones. New diffused-type LEDs need to be developed to fulfill the requirement of the BLU industry. A non-spherical lens is designed to optimize uniformity, and a great improvement in uniformity from 28.4 to 64% is demonstrated. In the future, it may used in an LED display to improve the unevenness of illumination.     

Effect of Host Medium on the Fluorescence Emission Intensity of Rhodamine B in Liquid and Solid Phase

In this work, we study the effect of concentration, host medium, PH and phase states on the fluorescence emission from the laser dye Rhodamine B pumped by UV laser as exited source. The polymethylmethacrylate PMMA is used as a host medium in case of solid phase samples while, ethanol and Tetrahydrofuran (THF) are used in case of a liquid one. Laser Induced Fluorescence (LIF) technique was used to study the fluorescence properties of both cases of liquid and thin film solid-state samples. In addition, the Dual Thermal Lens (DTL) technique was used to study the quantum yield of these samples. The concentrations of Rhodamine B in ethanol as solvent between 2 × 10⁻² M and 5 × 10⁻⁶ M were studied. The maximum fluorescence emission is observed at concentration of Rhodamine B C = 3 × 10⁻⁴ M. Comparison studies were investigated for different host medium such as ethanol, THF, PMMA in liquid phase state and PMMA in solid phase state. The measurements revealed that, the behavior of both phases state was analogous. Rhodamine B/PMMA thin film sample by ratio of 4:1 and thickness 0.12 mm was found to have the best photostability sample with a quantum yield about ≈0.82.     

Free-form lens design for wide-angle imaging with an equidistance projection scheme

An algorithm of free-form lens design is presented that can realize wide-angle imaging in conjunction with conventional imaging devices. The wide-angle image obtained through the free-form lens and the camera is not affected by distortions. The formula for the free-form lens surfaces is derived. The surface profile of the free-form lens can be generated through solving a differential equation expressing the camera-viewing angle as a function of the angle of incidence on the free-form lens surface. The surfaces preserve a linear relationship between the angle of incidence of light onto the surface and the angle of refraction into the imaging device.     

计算全息法测量长焦透镜面形和焦距

为了同时对长焦透镜的面形和焦距进行高精度检测,提出在Zygo干涉仪的球面光路中加入一个二元衍射元件作为检测件的计算全息法。 首先对计算全息法检测长焦透镜的面形和焦距进行了理论推导,并给出焦距误差公式。在Zemax中使用在平面基底上制作的二元衍射元件对一个长焦透镜的面形和焦距进行了模拟检测,其中对该长焦透镜面形的干涉检测PV值为0.0034λ,对焦距的检测精度为-0.11%。最后详细分析了两类误差对检测结果的影响,其中光学元件的位置误差影响不超过0.1λ;二元衍射元件的制造误差影响约0.01λ,在具体制造过程中,其径向位置误差和台阶误差可分别在2 μm和5 nm之内。在综合考虑各项误差的情况下,该方法的检测精度仍然可控制在2λ/25之内。     

The validity of high-pass angular spectrum filter in solid immersion lens system

应用矢量方法计算了具有高通角谱滤波器的固体浸没透镜（SIL）系统的焦场分布。数值结果显示，对于径向（角向）偏振输入光，高通角谱滤波器可以减小SIL系统的光斑（暗斑）大小。然而，对于线性偏振输入光，简单的高通角谱滤波器不能够优化SIL系统的光场分布，也不能够改进系统的光存储密度。     

用于微型生化分析的光探测系统

针对微生化芯片样品剂量少和与微流体芯片集成等要求,设计了两种在芯片内用分光光度法对混合后液体的吸收光谱进行探测的方法。实验利用510～840 nm的可见光光源,采用了直接探测法和消逝波探测法对样品进行探测。通过两种方法的比较证明：直接探测法具有原理简单、消耗样品量少和结构容易实现等优点;消逝波探测法具有需要样品量极少、灵敏度高和易于集成的优点。     

室外自然场景体视彩虹全息图的制作方法研究

本文介绍了一种用连续激光制作室外自然场景体视彩虹全息技术. 先用自制的透镜线阵照相机拍摄室外自然场景经透镜所成像的初级体视图，然后用连续激光照明初级体视图，原光路返回，透镜线阵此时不仅起到成像作用，而且起到了彩虹全息术中的狭缝作用. 这种技术也适用于室外动态物体. 本文制作了室外自然场景的体视彩虹全息图，并给出了实验结果.     

自聚焦透镜的傅里叶变换性质及成像性质

对自聚焦透镜的二维傅里叶变换性质,成像性质以及脉冲响应作了系统论述.并从理论上对自行研制的自聚焦透镜的光斑尺寸进行了计算.在不考虑像差的情况下,直径为1.8 mm的透镜其出射光斑直径为1.2 μm,利用狭缝扫描法进行了实际测量,测量值为1.5 μm,理论值与实验值基本吻合,从而说明理论分析的合理性.     

控制液晶器件产生的程控透镜和微透镜阵列

研究了计算机程控光学器件的性能。通过对液晶空间光调制器进行电寻址控制,得到了振幅模式、二进制相位模式和连续相位模式的计算机程控透镜和程控微透镜阵列。实验结果和计算分析都表明,连续相位模式的程控透镜具有较好的聚焦性能和光效率。程控微透镜阵列的优点是阵列中的每一个微透镜都可以单独控制,可以得到所需要的阵列形式。实验给出了一个由这样的微透镜阵列产生的去掉了中心4×4阵列的8×8光斑阵列样式。还给出了利用程控透镜来方便有效地演示和研究透镜的像差方法。由计算机控制空间光调制器得到的光学器件虽然具有极大的灵活性,但是由于空间光调制器的像素的尺寸影响了它的精细程度,限制了它的应用。