细激光束在全息照像中的应用

本文指出全息记录材料可看作一散射物体,当激光束通过它后形成散射光,对全息再现象来说,它就是散射噪声,利用细激光束很容易测量出散射噪声和记录材料中散射颗粒的大小,后者对干板的鉴别率起着决定性的作用,而鉴别率不够,将会导至全息记录的彻底失败。并报导了;如何利用细激光束的散射图象,来分析模压全息图片和全息再现像的波像差,以及在全息干涉计量中用细激光束成像从干涉条纹获取信息的方法。     

聚N-乙烯咔唑光敏片的全息记录特性

本文研究了聚N-乙烯咔唑光敏片的全息记录特性,如振幅透过率～曝光量特性、分辨率、衍射效率和感光灵敏度等,并用激光照出了全息象。     

全息片质量对原子全息光刻图形影响的模拟研究

全息片质量是影响原子全息光刻再现图形质量的关键因素，然而其制作工艺复杂，工序繁多，质量难以控制，模拟研究有助于把握全息片制作工艺中的关键环节，提高全息片的质量。详细模拟了全息片的三个主要质量指标：刻透率、分辨力以及薄膜厚度对再现像质的影响，结果表明：刻透率控制在90％左右即可满足要求，分辨率应优于0．1μm，膜层应尽量均匀。     

一种用双斜复合反射全息扩大全息激光防护镜防护角的方法

提出了一种扩大全息激光防护镜防护角的方法：将两块条纹面与介质表面相倾斜的反射全息对称胶合，致使防护角与单片反射全息相比提高了一倍。实验结果表明０．５３μｍ的光在－３０°至２７°范围内入射时；双斜复合反射全息的光学密度在２．３至３．５之间变化，可见光透过率大于６０％。     

未来数据储存技术与硬盘的发展(续)

<正>4全息储存技术中的几个重要问题在全息储存中既希望数据储存容量大又希望数据传输率高,而且全息图像还要稳定。Stanford大学Hesselink教授的研究组在2004年结合他们自己以及他人的HDSS,对此进行了较系统的分析和讨论[47,51]。下面本文分几个问题进行讨论。     

用于相关滤波的二元计算干涉图的载频分析

本文对二元计算全息干涉图用作相关滤波器时的载频进行了详尽分析,并给出实验结果。 设要记录的滤波函数为A(x,y)exP(jφ(x,y)],则可得二元计算全息干涉图的透过率为     

全息光盘

全息盘是把数据存贮在盘上的大容量装置 ,它可以提供 2 1世纪大规模数据存贮所需的性能。随着计划在单面 1 2 cm直径平板上达到 1 0 1 2 位的容量 ,全息盘有能力成为用于数据库的高效存贮器件。全息盘的快读出率使它特别适用于产生多路、宽带的数据流 ,例如对网络服务器的需要。在交互式视频和高清晰度电视的多媒体应用中 ,也能发挥全息存储器的大容量和快速数据存取的潜力。图 1　全息盘的数据读出图 1是全息光盘数据读出的概念图。此系统把数字全息图存储在一个平盘介质上。存贮的像安排在不同的轨迹中。盘可以连续旋转 ,也允许激光头穿过…     

激光全息演示仪

激光全息演示仪是一种综合性全息显示仪器,是全息教学的得力助手。它的显示功能包括:三维全息;双曝光全息干涉测量;全息存贮;全息光栅衍射;二维卷积定理演示;360°全息再现;象全息;全息透镜;反射全息;模压全息等。该演示仪使抽象的     

测量粒子场的红外激光同轴全息技术

采用同轴全息技术诊断粒子场时,粒子尺寸过小会影响再现粒子统计的精度,而粒子场分布密度过大会影响全息图像的记录质量.针对可见光同轴全息中出现的微小粒子分辨和光透过率弱等问题,提出采用红外激光进行粒子场诊断的方法.数值模拟了红外激光与绿光激光记录小粒子的情况,分析结果显示:红外激光将小粒子的再现像放大,信息光增强,有利于小粒子的记录;实验验证了红外激光透过高密度物场的能力明显高于绿光激光.从而表明采用红外激光同轴全息技术进行小尺寸、高密度粒子场的实验诊断具有一定的优势.     

数字化全息及其在三维显示和检测中的应用

从三维显示和检测的角度回顾了数字化全息研究的发展与现状.首先简要介绍了在三维显示的应用中计算全息的编码原理,以及全息图数字化再现的几种算法.给出了计算全息一般的制作方法,对典型的光电全息记录光路进行了分析,然后对数字化全息在三维显示和全息影视中的应用研究进行了讨论.分析了几种数字化全息显示装置,包括数字全息打印机,声光调制型的全息影视系统和空间光调制器型的全息影视系统.最后对数字全息三维显示技术的未来进行了展望.     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks     

Call for Papers—Feature Topic,Vol.12,No.7,2015

正Information Centric Networking Information-Centric Networking(ICN) is an emerging direction in Future Internet architecture research,gaining significant tractions among academia and industry.Aiming to replace the conventional host-to-host communication model by a data-centric model,ICN treats data content as the first