透明胶带纸中的色偏振现象

利用透明胶带纸代替波晶片进行各种色偏振实验,通过实验和理论分析总结了色偏振中的光的强度、色纯度、变色位置的变化规律.     

多功能偏振光演示仪在教学中的应用

设计了多功能偏振光演示仪,清晰地演示了偏振光的马吕斯定律、色偏振以及互补色原理.     

色偏振的理论及应用

本文就色偏振的理论作了详尽的分析。重点分析振幅Ａ１、Ａ２与角φ的关系，区别单色的干涉光与非干涉的白色背景光，得出在色偏振中光强、色纯度、互补色、变色位置和色调变化的规律。同时也对某些应用作了探讨。     

色偏振演示实验的改进

目前在大学物理课程中讲授偏振光干涉时，都少不了要随堂演示色偏振实验．但基本上都以改变晶片厚度来形成干涉彩色图象．本文采用改变晶片折射率的方法来演示色偏振现象，这一方面可开拓，学生研究问题的思路，另一方面使物理实验和实际应用能紧密结合起来．一、平行的平面编振光的色偏振原理偏振光干涉实验装置如图1所示．当二块平行放置的偏振片M和N互相正交，且未引入晶片C时，没有光能通过偏振片N，当引入一个光轴平行于晶面的晶片C后，则在偏振片N后的视场中可见到光．若光源为白光，且为平行光，则对一定厚度的晶片C，出射的光呈…     

对光的干涉和衍射的再认识

针对经常发生的对干涉与衍射关系的模糊认识,说明干涉与衍射的区别及联系,从而较深入地探讨了光的干涉和衍射的本质.     

浅析教学中的关联速度问题

高中物理学习过程中,在学习运动的合成与分解时,教师和学生都会遇到一些经典的关联速度问题.学生解决此类问题时也常常出错,教师的讲解往往看似合理,实质还是有背逻辑思维.文章分析了关联速度中的经典例题:绳拉船的问题,并且指出了许多教师的解法存在的争议,还讨论了更合理的常规解法和适于中学生理解的方法.文章中的"关联速度问题的中...     

弦、杆、环的横振动理论与实验研究

本文对弦的横振动方程进行了严格推导,得出波速的解析解,并在共振时测量了波长和共振频率的实验值,理论与实验相吻合.本文对杆的横振动方程亦进行了严格推导,对一端卡住、另一端自由时进行了数值求解,得出共振时容许的前几个本征频率的表达式及相应共振波节位置,给出通解,实验中测出了不同长度时不锈钢薄细长条的基频及前几阶泛音共振频率,测出的波节位置与理论值一致,并求出不锈钢长条的杨氏模量,与标准值相符.进一步推广到圆形钢丝环的小振动情形,实验上测出了圆环共振时的频率及波长,求出截面为圆形的细钢丝的杨氏模量,与现有值基本符合.     

我们生活在一碗汤面里吗?——光和电子的统一与起源

光和物质的起源是物理学中一个非常基本的问题,对该问题的探究贯穿了整个物理学的发展史.文章首先从最早的光微粒说和波动理论讲起,详细介绍了为什么光的波动学说可以成功地解释光的折射和干涉现象.然后以光的横波特性为基础,论述了是否存在可以承载光传播的媒介物质.通过对电荷和磁场的研究,人们认识到光是一种电磁波.最后从凝聚态物理学的演生原理出发,作者论述了弦网液体中的弦密度波对应于电磁波,弦的端点对应于电子,进而给出了光和电子起源的统一解释.     

大学物理实验课课堂教学实践及探索

从多角度多方面分析了大学物理实验课程的现状及存在的问题,对目前采用的教学方式进行改进,充分调动学生在课堂的积极性和体现教师的引导作用,并对改进前后的方式进行了调查和成绩统计,验证了该方法的有效性。     

一种新型SOI结构——SiGe-OI材料研究进展

SOI(silicononinsulator ,绝缘层上的硅 )技术和SiGe(silicongermanium ,锗硅 )技术都是微电子领域的前沿技术 .SiGe-OI(SiGe -on -insulator ,绝缘层上的锗硅 )新型材料是最近几年来才出现的一种新型SOI材料 ,它同时具备了SOI技术和SiGe技术的优势 ,因而成为当前微电子研究领域的最前沿课题之一 .文章结合中国科学院上海微系统与信息技术研究所的工作 ,综述了SiGe-OI材料研究情况和应用前景 ,详细介绍了其主要的制备方法 ,最后报道了作者在SiGe -OI材料研究上的一些实验结果 .     

新型偏振干涉成像光谱仪中格兰-泰勒棱镜像质分析与评价

阐述了自行研制的新型偏振干涉成像光谱仪中重要偏光器件格兰-泰勒棱镜的分光机理,应用光线追迹法分析计算了光在格兰-泰勒棱镜中的传播规律与光线轨迹;推导出了任意角度入射时光线在棱镜中的传播方向及出射点坐标;给出了格兰-泰勒棱镜的像点位移和色差理论计算公式.该研究对晶体器件像质的分析计算及评价具有普遍的指导意义,为新型偏振干涉成像光谱技术的研究以及偏振干涉成像光谱仪的研制提供了重要的理论依据. 关键词： 偏振干涉成像光谱仪 格兰-泰勒棱镜 像点位移 色差     

偏振模色散动态补偿中色度色散影响的研究

分析了色度色散(CD)对偏振模色散(PMD)动态补偿中偏振度(DOP)反馈的影响,模拟和实验验证了2．5Gb／s和10Gb／s非归零调制系统中光信号偏振度特性和系统误码率特性。表明有色度色散作用时信号偏振度值比仅受偏振模色散作用时要大．但误码率随色度色散量增加先轻度好转后就逐渐变差．偏振度值将不能如实反映偏振模色散对系统性能的影响。且信号两正交偏振分量间能量差别越小或差分群延迟越大,上述两种情况下信号偏振度值偏离就越远。这种偏离还随系统速率和色度色散量的增加而加剧。进一步探讨了实际偏振模色散补偿中减轻色度色散影响的措施,表明当系统中同时存在偏振模色散和色度色散影响时,必须在基于偏振度反馈的偏振模色散补偿前完成色度色散补偿。     

Multiple defect-core hexagonal photonic crystal fiber with flattened dispersion and polarization maintaining properties

In this paper, we present a dispersion controlling technique with a multiple defect-core hexagonal photonic crystal fiber (MD-HPCF). By omitting air holes in the core region of the conventional HPCF and adjusting the size of air holes around the newly formed core, we can successfully design low flattened dispersion PCF with low confinement loss, as well as high birefringence. The low flattened dispersion feature, as well as the low confinement losses and high birefringence are the main advantages of the proposed PCF structure, making it suitable as chromatic dispersion controller, dispersion compensator, and/or polarization maintaining fiber.     

Polarization and Color Separator Using Binary Phase Grating with Subwavelength Period

A data projector using three liquid crystal display panels has a complex optical system. The illuminating optics separate the beam from a light source into three primary colors and separate those into opposite polarizations using multi-layer films and prisms. A reflection grating with the period of subwavelength has high diffraction efficiency for p polarized light and high regularly reflectance for s polarized light. The diffraction angle of a grating largely depends on the wavelength, because a diffractive optical element (DOE) has large chromatic dispersion. The grating with the period of subwavelength can separate the unpolarized light into polarization components effectively using its polarization dependency and can separate white light into color components using its chromatic dispersion simultaneously. The grating makes the optical system simpler and smaller than those with conventional devices. In this paper the efficiency of polarization separation for the grating is calculated by a rigorous analytical method. Next, the condition for color separation is calculated by Snell#x0027;s law, and an optical system using a grating that performs polarization and color separation is proposed. Experimental results of the DOE fabricated are well matched with those of this simulation.     

Performance Analysis of High-speed Optical Pulse Transmission in Dispersion-managed Nonlinear Birefringent Fiber Using Quantum Well Laser Diode Sources

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Performance Analysis of High-speed Optical Pulse Transmission in Dispersion-managed Nonlinear Birefringent Fiber Using Quantum Well Laser Diode Sources

This paper analyzes the high bit-rate optical pulse trasmission in single mode optical fiber with chromatic dispersion, polarization mode dispersion (small random birefringence) and nonlinearity. Numerical method employed can precisely describe their interactive effect on transmission performance. Different dispersion maps and the related performance are analysed. Various simulation results and discussion are given. The results show that chromatic dispersion compensation should be carefully designed. Appropriate dispersion management can also alleviate the effect of polarization mode dispersion.     

光纤偏振效应导致脉冲展宽的解析模型

在10Gb／s,尤其是40Gb／s以上高速光纤通信系统中,光纤的偏振特性已成为限制系统传输距离的主要因素之一。光纤的偏振效应主要包括偏振模色散和偏振依赖损耗。而脉冲均方根展宽是判断信号传输性能的一个主要物理量。本文讨论了光纤线路偏振模色散与偏振相关损耗的相互作用及对信号脉宽的影响。给出了线路偏振模色散矢量和偏振相关损耗矢量之间的关系式,并基于严格的数学方法,导出了在光纤偏振模色散和偏振相关损耗共同作用下的信号均方根脉宽变化的解析形式,同时考虑了光纤色散,啁啾等。该模型可用于分析高阶偏振模色散和偏振相关损耗,任意线性光纤通信系统脉冲展宽分析。     

应用折-衍射元件校正人眼色差

提出了采用两个折射-衍射元件对人眼系统在14°范围内进行色差校正的光学系统设计方法。基于系统光学性能的评价与单片折射-衍射元件色差校正系统的对比验证了本文提出的色差校正系统的性能。结果表明：两种色差校正系统都可以很好地校正人眼的轴向色差。但是,单片折射一衍射色差校正系统引入了横向色差,其由校正前的14．51μm增加到81．4μm,严重影响了边缘视场处的成像质量。而采用双片折射一衍射元件的色差校正系统可同时对轴向色差和横向色差进行校正,使横向色差降为1．64μm。设计的色差校正系统可有效提高视网膜的成像质量,并可用于视觉仪器。     

On the chromatic aberration of magnetic lenses with a field distribution in the form of an inverse power low (B(z) ∝ z)

The chromatic aberration of magnetic lenses with the field distribution in the forms of inverse law have been studied by analytical and digital methods. These aberrations can be expressed in terms of Bessel function of fraction order. Analytical expressions for chromatic aberration coefficients of the spherical field model, which is useful for the study of single-pole magnetic lenses, are given.     

Chromatic Induction on Achromatic Locus and Its Spatial Integration

There were two purposes in the present study. The first was to find quantitative relationships in chromatic inductions between the inducing colors and the chromatic shifts produced in a test field based on the responses of photoreceptors and opponent color channels. The second was to investigate the spatial integration of chromatic inductions. Using a nulling method with a haploscopic view, magnitudes of chromatic inductions were measured with multicolored surrounding fields. The effects of chromatic inductions on achromatic locus could then be represented by power functions of opponent chromatic responses of the surrounding colors. In regard to spatial integration, we concluded that when a white test field was surrounded by a multicolored field, the apparent color shifts in the test field could be explained by the sum of the induction effects produced individually by the surrounding colors.