CyberOptics在2008年上海Nepcon展览会上展示SE 300 Ultra^TM 3-D焊膏检测系统

CyberOptics公司宣布，在中国上海2008年4月8．11日举行的NEPCON China／EMT China2008展览会上，它将在西Ll厅第1A26号展台展示其业内领先的3．D焊膏检测系统SE 300 Ultra。

Electronic Absorption Spectra and Third-Order Nonlinear Optical Property of Dinaphtho[2,3-b:2’,3’-d]Thiophene-5,7,12,13- Tetraone (DNTTRA) and Its Phenyldiazenyl Derivatives: DFT Calculations

Third-order nonlinear optical (NLO) materials have broad application prospects in high-density data storage, optical computer, modern laser technology, and other high-tech industries. The structures and frequencies of Dinaphtho[2,3-b:2’,3’-d]thiophene-5,7,12,13-tetraone (DNTTRA) and its 36 derivatives containing azobenzene were calculated by using density functional theory B3LYP and M06-2X methods at 6-311++g(d, p) level, respectively. Besides, the atomic charges of natural bond orbitals (NBO) were analyzed. The frontier orbitals and electron absorption spectra of A-G5 molecule were calculated by TD-DFT (TD-B3LYP/6-311++g(d, p) and TD-M06-2X/6-311++g(d, p)). The NLO properties were calculated by effective finite field FF method and self-compiled program. The results show that 36 molecules of these six series are D-π-A-π-D structures. The third-order NLO coefficients γ (second-order hyperpolarizability) of the D series molecules are the largest among the six series, reaching 107 atomic units (10-33 esu) of order of magnitude, showing good third-order NLO properties. Last, the third-order NLO properties of the azobenzene ring can be improved by introducing strong electron donor groups (e.g. -N(CH3)2 or -NHCH3) in the azobenzene ring, so that the third-order NLO materials with good performance can be obtained.

A"messenger zone hypothesis"based on the visual three-dimensional spatial distribution of motoneurons innervating deep limb muscles

Coordinated contraction of skeletal muscles relies on selective connections between the muscles and multiple classes of the spinal motoneuro ns.Howeve r,current research on the spatial location of the spinal motoneurons innervating differe nt muscles is limited.In this study,we investigated the spatial distribution and relative position of different motoneurons that control the deep muscles of the mouse hindlimbs,which were innervated by the obturator nerve,femoral nerve,inferior gluteal nerve,deep pe roneal nerve,and tibial nerve.Locations were visualized by combining a multiplex retrograde tracking technique compatible with three-dimensional imaging of solvent-cleared o rgans(3DISCO)and 3-D imaging technology based on lightsheet fluorescence microscopy(LSFM).Additionally,we propose the hypothesis that"messenger zones"exist as interlaced areas between the motoneuron pools that dominate the synergistic or antagonist muscle groups.We hypothesize that these interlaced neurons may participate in muscle coordination as messenger neurons.Analysis revealed the precise mutual positional relationships among the many motoneurons that innervate different deep muscles of the mouse.Not only do these findings update and supplement our knowledge regarding the overall spatial layout of spinal motoneurons that control mouse limb muscles,but they also provide insights into the mechanisms through which muscle activity is coordinated and the architecture of motor circuits.

Optical transmitter module with hybrid integration of DFB laser diode and proton-exchanged LiNbO_(3)modulator chip

In this work,a hybrid integrated optical transmitter module was designed and fabricated.A proton-exchanged Mach–Zehnder lithium niobate(LiNbO_(3))modulator chip was chosen to enhance the output extinction ratio.A fiber was used to adjust the rotation of the polarization direction caused by the optical isolator.The whole optical path structure,including the laser chip,lens,fiber,and modulator chip,was simulated to achieve high optical output efficiency.After a series of process improvements,a module with an output extinction ratio of 34 dB and a bandwidth of 20.5 GHz(from 2 GHz)was obtained.The optical output efficiency of the whole module reached approximately 21%.The link performance of the module was also measured.

超短脉冲激光在掺Er^(3+)磷酸盐玻璃中制备光波导的实验研究

超短脉冲激光通过非线性吸收调制光学材料折射率提供了一种高效制备集成三维光子器件的途径.掺Er^(3+)磷酸盐玻璃由于其优异的特性以及在1.55μm通信波段附近的发射光谱,成为了集成光学主动增益材料中的研究热点.实验采用重复频率1 kHz,中心波长800 nm,脉冲宽度120 fs的钛宝石飞秒激光放大系统作为制备波导的光源,系统研究了加工参数对激光写入形貌、波导形成及光学特性的影响.实验结果表明,在狭缝整形辅助短焦物镜横向刻写条件下,写入脉冲能量为1.8μJ时,光波导可以在写入速度为10μm/s-160μm的较宽范围内形成;写入速度为40μm/s时,光波导写入脉冲能量参数窗口为1.6μJ-2.0μJ;波导写入深度在125μm-200μm范围时,波导横截面对称性较好且折射率修改明显;近场强度测量结果显示所制备波导近场强度分布对称,导光特性良好.通过有限差分法反推波导区域折射率修改分布,结果显示最大折射率修改为Δn=6.6×10^(-4).截断传输损耗测量结果显示所制备波导的传输损耗低至0.91 dB/cm.

Automated Phase-measuring Profilometry of 3-D Diffuse Objects Using a Single Phase Step Method

The technique of phase measuring profilometry using a single phase step method is proposed.This method can automatically obtain phase value at each pixel by using a discret cosine transform algorithm.The method is able to automatically recognize any position between depression and elevation on an object surface.Theoretical analysis and experimental verification are presented.

Importance of 3-D image reconstruction of spectraldomain OCT on outcome of grid laser photocoagulation for diffuse diabetic macular edema

AIM:To present the outcome of modified grid laser photocoagulation(GLP)in diffuse diabetic macular edema(DDME)in eyes without extrafoveal and/or vitreofoveal traction.METHODS:Inclusion criteria for the retrospective study were DDME eyes of patients with typeⅡdiabetes mellitus that had≥4 months of follow-up following GLP.Only one eye per patient was analyzed.Using 3-D spectral-domain optical coherence tomography(3-D SDOCT),eyes that had either extrafoveal or vitreofoveal traction,or had been previously treated by an intravitreal medication(s)were excluded.Treated DDME eyes were divided into 4 groups:A)"Classic"DDME that involved the central macula;B)edema did not involve the macular center;C)eyes associated with central epiretinal membrane(ERM);D)DDME that was associated with macular capillary dropout≥2 disc-diameter(DD).RESULTS:GLP outcome in 35 DDME eyes after 4-24(mean,13.1±6.9)months was as follows:Group A)18eyes with"classic"DDME.Following one or 2(mean,1.2)GLP treatments,best-corrected visual acuity(BCVA)improved by 1-2 Snellen lines in 44.4%(8/18)of eyes,and worsened by 1 line in 11.1%(2/18).Central macular thickness(CMT)improved by 7%-49%(mean,26.6%)in77.8%(14/18)of eyes.Causes of CMT worsening(n=4)were commonly explainable,predominantly(n=3)associated with emergence of extrafoveal traction,5-9months post-GLP.Group B)GLP(s)in DDME that did not involve the macular center(n=6)resulted in improved BCVA by 1-2 lines in 2 eyes.However,the central macula became involved in the edema process after the GLP in 3(50%)eyes,associated with an emergence of extrafoveal traction in one of these eyes 4months following the GLP.Group C)GLP failed in all 5eyes associated with central ERM.Group D)GLP was of partial benefit in 2 of 6 treated eyes with macular capillary dropout≥2DD.CONCLUSION:Eyes with DDME that involved the macular center were found to achieve favourable outcomes after GLP(s)during mid-term follow-up,unless complicated pre-GLP or post-GLP by vltreoretinal interface abnormalities,often extrafoveal traction or ERM,or by capillary dropout≥2DD.Prospective studies with larger cohorts are required.

基于165Y-75Y LiNbO_(3)的声表面波器件的声光互作用性能分析

该文从理论上仿真了切割方向为165°Y,传播方向为75°Y的LiNbO_(3)晶体(简称165Y LN)的表面波声光调制器的场分布及其重叠积分、驱动功率随波导厚度变化的关系,并与其他切割方向的仿真结果进行了比较。该方向位于材料退耦面内,且在该面具有最大的机电耦合系数,是潜在的高性能切割方向。测试表明,165Y LN的TE模和TM模在低频区均有较低的驱动功率和较大的重叠积分带宽,可被用于制作具有高性能且对偏振不敏感的表面波声光器件。

On the integration of two-dimensional animation and three-dimensional art animation

In recent years, with the level of science and technology progress, largely to promote the development of animation techniques. Animated film is divided into two-dimensional animation and three-dimensional animation, both in the retention feature animated films, based on the performance of each with different strengths, thus forming a different artistic style. Wherein the two-dimensional animation is the most common one is the most basic form of expression in animation technology is relatively mature and complete, but because of the development of animation techniques, two-dimensional animation can not meet the needs of the audience. Thus, the effective combination of two-dimensional animation and three-dimensional animation technology, the advantages of integration between the two is particularly important, so that innovation in the form of screen performance, enhance audio-visual experience. In this paper, two-dimensional animation and three-dimensional animation skills fusion analysis and research, and put forward a number of specific observations, in order to learn.

LiNbO_3集成光学元件在光纤传感器中的应用

Li Nb O3 集成光学元件在光纤传感器中占有重要地位。叙述了 Li Nb O3 集成光学元件在光纤传感器中的应用情况及最新发展 。

基于LiNbO_3波导的共线集成声光器件

回顾了基于LiNbO3 波导的共线声光器件的研究进展。介绍了该类器件在光束偏转和调制、信号处理、光计算等领域的应用现状 。

A 12-Bit 1-Gsample/s Nyquist Current-Steering DAC in 0.35 µm CMOS for Wireless Transmitter

The present work deals with 12-bit Nyquist current-steering CMOS digital-to-analog converter (DAC) which is an essential part in baseband section of wireless transmitter circuits. Using oversampling ratio (OSR) for the proposed DAC leads to avoid use of an active analog reconstruction filter. The optimum segmentation (75%) has been used to get the best DNL and reduce glitch energy. This segmentation ratio guarantees the monotonicity. Higher performance is achieved using a new 3-D thermometer decoding method which reduces the area, power consumption and the number of control signals of the digital section. Using two digital channels in parallel, helps reach 1-GSample/s frequency. Simulation results show that the spurious- free-dynamic-range (SFDR) in Nyquist rate is better than 64 dB for sampling frequency up to 1-GSample/s. The analog voltage supply is 3.3 V while the digital part of the chip operates with only 2.4 V. Total power consumption in Nyquist rate measurement is 144.9 mW. The chip has been processed in a standard 0.35 μm CMOS technology. Active area of chip is 1.37 mm2.

飞秒激光在掺Nd^(3+)光热敏折变玻璃中写入光波导

利用中心波长1 028nm、重复频率50kHz、脉冲宽度220fs的超短脉冲激光在掺Nd^(3+)光热敏折变玻璃中刻写双线型和压低包层管状波导.研究了激光功率、波导双线间距、管状波导直径对近场模式的影响,得到了两组导光模式较优的波导.利用波导的近场模式强度分布重构了其折射率分布图,得到两类波导最大的折射率增加量分别为+7.0×10^(-4)和+5.5×10^(-4).利用散射法测得双线型波导的传输损耗为1.29dB/cm;通过测量插入损耗得到压低包层管状波导的传输损耗小于1.95dB/cm.利用飞秒激光在掺Nd^(3+)光热敏折变玻璃中直接写入光波导,在集成光学器件上具有广阔的应用前景.

ACHIEVING THE NET-ZERO-ENERGY-BUILDINGS “2020 AND 2030 TARGETS” WITH THE SUPPORT OF PARAMETRIC 3-D/4-D BIM DESIGN TOOLS

INTRODUCTION The level of man-made CO_(2) emissions worldwide climbed to a new record of 30 billion tons in 2010.In 2011,at the COP17 U.N.Climate Change Conference in Durban,South Africa,high-ranking representatives from around the world met again to discuss solutions.For the building sector,numerous energy-efficiency market changes and benchmarking resolutions,like the mandatory E.U.“nearly Net-Zero-Energy-Building(NET-ZEB’s)2018 and 2020 regulations”for all new public and privately owned buildings are now set up to help minimizing carbon emissions and reverse the negative impact.1 In the United States,the American Institute of Architects(AIA)adopted the 2030 Challenge as a voluntary program,where participating buildings aim to achieve a 90%fossil fuel reduction by 2025,and carbon-neutrality by 2030.2 To accomplish these energy goals,designers must strive to best design and utilize the resources available on a site.However,are these goals of achieving carbon-neutral buildings possible?How can NET-ZEB’s become the curricular standard and practical routine in education and the profession?To date,the basic curricular design process components with integrated project delivery metrics for a robust 3-D/4-D-net-zero regulatory design framework are either incomplete or missing,However,formally-based curriculums have begun to weave carbon-neutral design tools into their pedagogy.This research paper critically compares how these new criteria for digital 3-D-building information modeling(BIM),and“Integrated Project Delivery”are mandating a better integration of collaborative carbon-neutral designs into the curriculum and practice of the profession.The majority of those in architectural academia have been using generative computation primarily for pure,aesthetic form-finding,without applying zero-carbon-energy-driven global performance metrics and CO_(2)e reduction strategies to reiterate derived carbon-neutral designs.The advantage of 3-D-parametric design is that it links variables,dimensions,and materials to geometry in a way that when an input or simulation value changes,the 3-D/4-D model automatically updates all life-cycle scenarios and components simultaneously.

Fast acquisition of 3D images in a modified optical microscope based on integral imaging

This paper introduces a new technique of fast acquiring 3D information in microscope based on integral imaging. Experimental results prove that the proposed method has advantageous properties including simple configuration, no requirement of coherent light source and real-time 3D imaging information acquisition. This technique has an important prospect on optical microscopy and 3D display.

Variational analysis of eigenmodes of integrated optical waveguides and applications

An iterative procedure is proposed for the variational analysis of Ti:LiNbO3 optical waveguides. A trial solution for the dominant electric field profile of arbitrary-order eigenmodes in strip waveguides and two coupled waveguides is proposed and its parameters are determined using the variational method. The results calculated using this method agree well with those obtained using the finite-element method. The present method has been used to check the accuracy of the effective index method as well as a quasi-analytical technique based on the effective index method. The results show that the effective index method is generally accurate for the fundamental mode and becomes less accurate for higher-order vertical modes.

机载雷达罩电讯设计中的AI-SI仿真技术

本文应用矢量口径积分和表面积分技术 ,给出了机载雷达罩波瓣特性的定量分析方法 ,在天线俯仰面尺度与波长相近及天线罩俯仰面曲率变化大的情况下 ,口径积分 表面积分方法比三维射线法更为精确 ,仿真计算结果与试验结果较为符合 ,证明了算法的有效性 .

“资源三号”02星载激光高度计收发匹配设计

随着星载激光高度计激光发散角和接收视场越来越小,对收发匹配的要求也越来越高,必须开展星载激光高度计收发匹配的仿真设计。文章对星载激光高度计光机系统的主要组成进行了介绍,分析了影响收发匹配的因素。针对激光器仿真技术不完善的问题,提出了基于激光器环境试验的星载激光高度计收发匹配仿真设计方法。该方法成功应用于"资源三号"02星激光高度计的设计中,卫星飞行所带来的收发不匹配约为47μrad,激光的指向变化和抖动小于40μrad,力学环境引起的失调小于35μrad,热环境引起的失调小于45μrad,光学装调精度优于20μrad,最终确定接收视场为500μrad。"资源三号"02星激光高度计目前已经在轨工作超过2年,有效验证了激光高度计收发匹配设计的有效性,对后续星载激光高度计收发匹配设计具有一定的借鉴意义。

与偏振无关的波导强度调制器

用点匹配法计算了与偏振无关调制器的半波电压，用ＦＦＴ－ＢＰＭ法分析两平行波导之间的耦合，设计制作了在１．

光学系统的微小化三维集成

本文介绍作者提出的基于晶体光学原理的三维光学系统微小化集成技术的进展 ,着重介绍光折变晶体的微系统单块集成技术 ,即在一块铌酸锂晶体中空间选择性地生成各种所需的局域全息光学元件或功能元件 ,讨论所发展的新的非挥发光折变全息的机理、材料、方法和应用 ,以及实现大规模光交换开关矩阵的可能。