高能激光系统内光路热效应建模与仿真

高能激光系统内光路热效应是影响系统性能的重要因素,介绍了内光路中光学元件、介质气体热效应物理模型,分析了影响热效应的主要因素,并开展了热效应变化规律研究。针对光学元件,重点研究了元件吸收率、元件材料特性、光斑分布对反射镜、窗口镜、分光镜热像差的影响规律,指出吸收率主要影响热像差的大小,而元件基底材料特性和激光分布影响热像差时间和空间变化。针对介质气体,指出介质气体升温后重力引起的自然对流是影响气体热像差的主要物理因素,细致研究了热像差随时间的变化规律,介绍了降低封闭与开放式内光路介质气体热像差的措施与方法。介绍了激光仿真软件平台Easylaser多物理仿真模块,搭建了包含反射镜、窗口镜、分光镜和介质气体的内光路计算模型,通过光-热-力-控多物理耦合仿真,研究了反射镜与窗口镜、介质气体与窗口镜热像差补偿效应,给出了激光传输远场光斑特征,表明了Easylaser的多物理仿真模块具备对内光路热效应综合仿真分析能力。     

彩色显示管电子光学系统的计算和分析

为了实现高清晰度显示,大量采用非旋转对称的系统以减小电子束上屏的束点尺寸。考虑到目前电子光学系统的一些新特点,采用一些特殊的模拟方法利用SEU-3D三维程序计算和分析了彩色显示管中电子光学系统     

一种新型数字化衍射光变图像的存贮系统

研制了一种新型数字化衍射光变图像的存储系统。采用SLM作为自动文字输入,由消像差的远心缩微光路缩小输入文字,每个输入文字均由光栅干涉头进行调制,从而形成用于光信息存储的干涉光场,改变调制光栅的取向和条纹间隔,将改变存储文字的衍射特性。在光刻胶干版上的存储实验表明,存储的最小衍射文字尺寸可达40μm,单通道存储达3.7×104bits/cm2,而且存储的信息可以复制。     

30cm大屏幕高分辨率X光电视光学系统研究

本研究发表了30cm大屏幕高分辨率电视光学系统所采用的参数、系统设计、结构特点和所能达到的性能指标。该系统已通过广研制并投入批量生产。     

基于ZEMAX软件的三组元变焦系统凸轮曲线设计程序

变焦系统凸轮曲线设计是变焦系统后期设计过程中十分重要的环节,曲线设计的好坏直接关系到系统像面的稳定程度.针对ZEMAX光学设计软件界面编写了三组元变焦系统凸轮曲线设计程序,确保像面稳定、像质优良.程序可准确给出凸轮曲线的数据和形状,借助该程序对变焦系统任意焦距位置的光学性能和像差特性进行实时评估,提高了变焦系统的设计效...     

Analysis and design of the color wheel in digital light processing system

Colorimetric characters are very important to the optical engine, the kernel of the projector. The equations to calculate the colorimetric characters of the color wheel in optical engine are proposed. They are proven by measurements and the calculation results. Based on this theory, the sensitivity of the spectral transmittance of the color filters to the chromaticity coordinates is analyzed. A conclusion on the color filters of the color wheel which is useful to the tolerance control is drawn. Finally, a color wheel system is designed by using the theory. The design can satisfy the specific of the original color wheel well.     

生物芯片检测系统中荧光信号强度及系统灵敏度分析

从生物芯片荧光信号检测系统结构出发,分析了荧光信号强度与激发光光学系统特性,荧光收集光学系统特性及构成系统的各元件的参量间的关系.建立了荧光信号强度与检测系统中各参量间的表达式,以及对系统灵敏度进行了分析.建立了系统最少可检测的荧光分子数与各参量的函数关系,并对所设计的悬浮生物芯片检测装置的系统灵敏度进行了估算,其灵敏度在曝光时间为1 s时可达7.9个荧光分子/μm2.     

基于数字滤波的主动式高光谱成像系统及其波长标定

基于数字滤波技术,提出了获取物体反射光谱数据立方体和光谱响应曲线的主动式新型高光谱成像系统。对传统WDF型瓦兹渥斯反射式单色仪进行了改装,在入射光一定的情况下,增大出射光通量,提高了照射在物体表面的光强。利用数字滤波方式代替光学窄带滤波器,解决了多个光学滤光片不能连续可调和其他滤波器成本高的问题,建立了波长连续可调,带宽可调的高光谱成像系统。针对系统的特点和采集方式,提出了适当的定标方式,其波长误差2nm。得到了绿色树叶效果良好的光谱数据立方体和响应曲线,表明提出的系统适用于实验室中小视场内的光谱成像测量研究。     

Film-thickness Error Analysis of Optical Disk Systems

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Film-thickness Error Analysis of Optical Disk Systems

It is difficult to exactly control the film thickness of optical disk multilayer in the actual coating process. The thickness error becomes a main factor affecting the optical characters of the film system. The thickness error′s sensitivity factor of dielectric optical multilayer is derived from the optical matrix in this paper. The effect of the thickness error on the reflectivity or reflectivity contrast of the optical disk multilayer is analyzed with a numerical calculation. The sensitivities to thickness error for different layers or in different film-thickness ranges are compared and discussed. A sketchy method defining allowable thickness error is given. Some experimental results verify the applicability of our theoretical analysis.     

深紫外光刻光学薄膜

深紫外波段是目前常规光学技术的短波极限,随着波长的缩短,深紫外光学薄膜开发面临一系列特殊的问题;而对于深紫外光刻系统这样的典型超精密光学系统来说,对薄膜光学元件提出的要求则更加苛刻。本文主要介绍了适用于深紫外光刻系统的薄膜材料及膜系设计;对薄膜沉积工艺、元件面形保障、大口径曲面均匀性等超精密光学元件的指标保障关键问题进行了讨论;对环境污染与激光辐照特性等光刻系统中薄膜元件环境适应性的重要因素进行了深入分析。以上分析为突破高性能深紫外光刻光学薄膜开发瓶颈,更好地满足深紫外光刻等极高精度光学系统的应用需求指明了方向。     

半导体激光自混合干涉仪稳定性的仿真分析

利用半导体激光器的Lang-Kobayashi方程,对半导体激光自混合干涉系统的动力学特性进行了仿真分析。研究结果表明,当光反馈系数较小时,激光器处于稳定状态,外腔长度不影响系统的稳定性;当光反馈系数较大时,激光器将进入不稳定状态,对于不同的外腔长度,激光器的稳定状态将发生变化。为实现大量程的位移或距离测量,光反馈系数必须足够小才能保证在较大外腔长度变化范围内,激光器始终处于稳定状态。     

静电透镜与磁偏转器的复合系统的电子光学性质和象差理论

本文将文献[1]的方法和结果加以推广,研究了旋转对称静电透镜和磁偏转器的复合系统。给出了场和轨迹的普遍表达式,讨论了高斯光学性质,得出了这种系统普遍的三级象差和象差系数的公式。这两篇文章有助于较全面地研究各种电子束管和电子光学仪器的偏转象差。 关键词：     

一种新型干涉成像光谱仪光学系统研究

介绍了一种新型静态干涉成像光谱仪—ＬＡＳⅡ形式的大孔径静态干涉成像光谱仪的原理、系统特性及要求,并对前置光学系统做了深入研究,光学系统的要求从全局考虑,实现普通玻璃复消色差,调制传递函数在３０对线时达到０．４以上。仪器具有原理简单、成本低（不高于色散型成像光谱仪的研制成本）、体积超小等特点。     

直接扣除法测量半导体光放大器频率响应

在光电子器件散射参量定义的基础上建立了基于直接扣除法的半导体光放大器频率响应测量系统,测量中通过扣除激光器和探测器系统的频率响应,得到放大器固有的频率响应。对InGaAsP体材料行波腔半导体光放大器样品进行了测量,得到了放大器在不同注入光功率和不同偏置电流下的频率响应曲线。这些曲线很好地反应了半导体光放大器的增益饱和和噪声特性,进一步分析发现半导体光放大器对低频调制信号的放大能力弱于对高频信号的放大能力,分析认为其原因在于半导体光放大器的载流子寿命有限导致低频信号长时间消耗载流子时,载流子数量无法及时恢复,从而使得增益降低。     

GaAs/GaAlAs traveling wave type laser amplifier with tilted facets

GaAs/GaAlAs traveling wave type laser amplifiers with different tilted angle facets are defined by proton bombardment. Some characters are measured. Maximum single-pass gains of 27.8 dB are reached with an optical fiber coupling system.     

新型自动立体显示背光板的光学设计

立体显示技术的研究主要是解决虚拟现实领域的三维视觉问题。自动立体显示是不需要配戴特殊眼镜的,使用一个二维平面空间显示屏显示至少一对满足双眼视差的立体图像。当人的双眼接受到具有视差的立体图像对时,在视网膜上形成视差像,经大脑神经系统的融合,从而产生深度感。提出了一种全新的实现自动立体显示的折射式方法,设计了基于此方法的一种新型折射式的、结构简单的、通过透射显示屏(如液晶显示屏)实现自动立体显示的背光系统。根据视差立体显示参量模型,建立了光学系统的结构参量以及分析了光学材料的性质对实现立体显示的影响,并运用先进的光学设计软件进行设计、模拟。     

光学平台微角振动激光探测方法研究

 设计了精密动态测角实验系统，该系统利用扩束镜正向和逆向不同的光学变换性质，将共孔径双向传输的倍增式角敏光学系统与光电精密位置传感器（PSD）相结合，并从理论上分析了高灵敏光学测角的基本原理，给出了被测角与传感器信号的关系。为消除光电噪声对探测分辨率的影响，信号处理引入了相关检测模式。通过压缩系统噪声信号的等效带宽，从频域中滤除干扰信号的频率成分，实现了从噪声中提取高分辨角度信息。     

Coherent optical neural networks and the generalization characteristic

Coherent optical neural-network systems are presented by which we are to realize (1) control of optical neural-network behavior by carrier frequency modulation and (2) frequency-domain multiplexing as a new degree of neural parallelism. In the coherent optical neural network, lightwave carries amplitude, phase, and frequency signals which are processed through optical neural connections consisting of transparency, delay, and optical nonlinear neurons. The neural learning process is realized by adjusting the delay time and the transpar-ency of the optical connections by regarding the carrier frequency as a learning parameter. A simulation experiment demonstrates that the proposed system learns desired output signals depending on the optical carrier frequencies, which leads to the above advantages. It is also found that the generalization characteristics depends on built-in input delays. The generalization quality is discussed from the viewpoint of function approximation or synthesis using sinusoidal basis functions.     

Incidental categorization of spectrally complex non-invariant auditory stimuli in a computer game task

This study examined perceptual learning of spectrally complex nonspeech auditory categories in an interactive multi-modal training paradigm. Participants played a computer game in which they navigated through a three-dimensional space while responding to animated characters encountered along the way. Characters' appearances in the game correlated with distinctive sound category distributions, exemplars of which repeated each time the characters were encountered. As the game progressed, the speed and difficulty of required tasks increased and characters became harder to identify visually, so quick identification of approaching characters by sound patterns was, although never required or encouraged, of gradually increasing benefit. After 30 min of play, participants performed a categorization task, matching sounds to characters. Despite not being informed of audio-visual correlations, participants exhibited reliable learning of these patterns at posttest. Categorization accuracy was related to several measures of game performance and category learning was sensitive to category distribution differences modeling acoustic structures of speech categories. Category knowledge resulting from the game was qualitatively different from that gained from an explicit unsupervised categorization task involving the same stimuli. Results are discussed with respect to information sources and mechanisms involved in acquiring complex, context-dependent auditory categories, including phonetic categories, and to multi-modal statistical learning.