多光束共焦三维测量系统误差的标定及校正

由于具有 非接触、精度高、测量速度快的特点,多光束共焦测量已经成为一种重要的光学三维测量手段。文章分析了系统中存在的像差,并对第二类像差（焦平面弯曲） 提出了测量和标定的方法,即通过测量平面镜来获取系统误差,通过对测量结果的球面拟合来进行标定,利用值即可进行系统误差的校正。采用此种方法可简光学系统设计,降低系统制造费用。最后给出了试验的结果。     

毛细石英管构成的高灵敏度光纤气压传感器

为实现高精度的气压测量,提出一种利用飞秒激 光微加工技术与光纤熔接技术制作的法布里- 珀罗(FP)干涉仪(FPI)型光纤气压传感器。利用波长800nm的飞秒 激光脉冲在毛细石英管侧壁上加工一微孔, 利用光纤熔接技术把毛细石英管熔接在一段单模光纤(SMF)和一段多模光纤(MMF)之间,制备 出一种光纤气压传 感器。通过改变传感器的FP腔内气压大小,导致FP腔内气体折射率改变,从而引起传感器 的透射 谱线性漂移,通过计算气压变化量与透射谱的谐振峰波长漂移量之间的关系就能够实现传感 器的气 压测量。理论分析了传感器实现气压测量的机理,实验测量了传感器的灵敏度。实验结 果表明, 传感器对周围气压变化的响应较大,透射谱的谐振峰波长随气压线性变化的灵敏度达到4.22nm/Mpa,而传感器对环境温度变化的响应很小,减少了温度对气压 测量的交叉感染。     

Self-alignment of micro-parts using capillary interaction: Unified modeling and misalignment analysis

Capillary forces induced by liquid meniscus are pivotal to many important technologies, including AFM measurement, powder technology, nano-objects manipulation and capillary driven self-assembly, etc. These forces (lateral, vertical and torque) are the object of substantial theoretical and numerical modeling, especially due to its significant influence on alignment reliability of fluidic self-assembly. To further understand the capillary interaction and misalignment mechanism, we propose a generalized semi-analytical capillary force model, extending the previous single-factor models to a unified one. With an ingenious meniscus deformation mode, surface energy and the associated capillary forces and torque are given simultaneously. The well accordance between model (when degenerated into previous single-factor modes) and Surface Evolver (SE) results indicates that the complex meniscus deformation process can simply be captured by translation and rotation of the “plate series” for small perturbations. Then the intercrossing effect on misalignment is systematically evaluated, from which we obtain a complex phase diagram (also confirmed by SE simulation) to characterize system local instability. It shows that angular misalignment is always associated with the lateral one, which is also observed in the existing experiment. Moreover, the presented model is suitable for other plates (binding sites) with arbitrary shapes.     

Analytical investigation to achieve the highest phase difference between two orthogonal components of light in lithium niobate based electro-optic system

Electro-optic Pockels cell are important opto-electronic devices for conduction of optical switching, optical modulation, where an electrical biasing signal acts on a polarized light passing through the system. Since last few decades lots of works are reported in this area. Again, it is observed that a good switching or modulation becomes realized if the depth of modulation is increased by increasing more phase difference between two orthogonal polarized components of light passing through the material against a biasing signal. Here in this paper the authors propose a new scheme, where multi-passing technique is used to create a high degree of phase difference between those two orthogonal polarized components of light against the biasing signal. The multi-passing of light through the material enables more and more optical path length for the light. So, more and more phase difference between the components of light beams, one passing outside the material and other passing through the material multiple times is created. This method ultimately generates a high degree of depth of modulation in optical switching.     

A Computerized Klinger Cavity Mode Conversion Test Set

A mode conversion test set utilizing the klinger cavity technique has been developed for characterizing circular waveguide components in the millimeter waveguide region. The test set incorporates a precision linear displacement optical encoder and a specially designed controller which interfaces the test set to a Hewlett-Packard 2100 series computer. Control commands of a stored computer program are used by the operator for data acquisition and analysis. Experimental results show this system has high measurement accuracy and sensitivity while maintaining an uncomplicated measurement process.     

Precision fabrication of D-shaped single-mode optical fibers by insitu monitoring

A technique has been developed to locally remove, over a distance of several millimeters of fiber length, the cladding layer of single-mode (at the 1300 nm wavelength) optical fibers with 1 μm depth precision by use of mechanical lapping and in situ optical transmission monitoring. A cylinder lap dressed with diamond is used to perform high-pressure mechanical lapping. The in situ monitoring technique is based on the specific different attenuations exhibited by higher order propagating modes (for 633 nm light) as the cylinder penetrates into the fiber. Advantages include relatively rapid overall processing, high lapping rate, good optical surface quality, and 1 μm precision. Experimental results are presented and analyzed by an approximate geometrical-optics model     

Microchip Self-Assembly on a Substrate Using Plasma Treatment

This paper demonstrates a flux/2-ethyl-1-hexanol mixture capable of performing a self-assembly process. An /Ar plasma treatment controls the surface free energy of Si, leading to better self-assembly driven by capillary force. Hydrophobic bonding pads resulting from ODT (1-octadecanethiol) SAMs (self-assembled monolayers) on a microchip can be self-assembled on hydrophobic bonding sites caused by a flux/2-ethyl-1-hexanol mixture on a substrate within 0.4 s. Microchips with 400200-rectangle bonding pads exhibited higher alignment precision (displacement error ; rotation error ) than 400400 -squares. The Owens-Wendt method was used to calculate the contact angle of 2-ethyl-1-hexanol to different bonding surfaces in water. Plasma treatment enabled the smallest contact angle of 2-ethyl-1-hexanol to ODT-modified Au surface (4.4), and the largest contact angle of 2-ethyl-1-hexanol to plasma-modified Si surface (153.5) in water. It explained why the plasma treatment exhibited benefit of self-assembly. This self-assembly technique could be used to assemble light emitting diodes, RFID tags, biosensors, or other types of microchips.     

空间遥感器非球面光学系统补偿器调整装置设计

根据空间遥感器非球面镜检测及光学系统装校对补偿器的调整要求,设计了一种V型支撑调整装置。阐述了该装置的组成、自由度调整功能以及部分设计原则。分析结果表明,该装置状态稳定,调整精度高,位移调整精度为1.39μm/deg,俯仰调整精度为0.0073～0.0232μrad/deg。用该装置对某离轴三反相机的光学元件和光学系统进行了检测和装调,取得了良好的效果。     

Self-Assembly for Integration of Microscale Thermoelectric Coolers

Optimum thermoelectric cooling (TEC) solutions often require the integration of component sizes inaccessible by common manufacturing techniques such as thin-film processing and robotic assembly. This work considers an application case in which small elements (100 μm to 300 μm thick) are optimal. A capillary self-assembly process is presented as a potential route to manufacturing TECs in these size ranges. A millimeter-scale demonstration of the assembly concept is presented and Monte Carlo simulation is used to study the scaling of the self-assembly approach to assemblies with more components. While assembly rate and system yield can be a challenge, several approaches are presented for increasing both rate and yield.     

激光干涉仪无线测控的设计和实现

针对传统激光干涉仪需要手动调节光学部件问题,设计并开发了一种激光干涉仪无线测控系统,该系统可以无线调节激光干涉仪光学部件的位置。系统采用nRF2401无线射频技术,与传统的nRF2401运用相比,该系统采用奇偶校验和CRC校验的双重校验,提高无线射频传输数据的正确率。同时系统采用闭环控制,提高了激光干涉仪的精确度和稳定性,避免了光学部件的过量调节对激光干涉仪的损伤。     

High power and high sensitivity planar lightwave circuit moduleincorporating a novel passive alignment method

A high-power, high-sensitivity planar lightwave circuit (PLC) module, comprising a laser diode (LD) and a photodiode (PD) surface mounted on a PLC platform, has been realized by a novel passive alignment technique. We used a spot-size transformed LD and a corner-illuminated PD to form a highly efficient optical coupling between the devices and a PLC waveguide. We used the unique marker alignment method to ensure accurate positioning of them. The positioning precision achieved in the lateral direction was within 1 μm for the LD's and within 10 μm for the PD's. The rotational precision was within 0.4° for both chips. We realized high power operation (>8 mW) with a high receiver sensitivity (0.3 A/W). In this paper, we describe a high power, high sensitivity PLC incorporating a novel passive optical alignment technique for LD's and PD's     

Structural studies of Langmuir-Blodgett films: technology and analysis

Using the Langmuir-Blodgett technique, ultra-thin films of organic molecules can be deposited on suitable substrates with a high degree of precision over the individual layer thickness. The electronic and optical properties of these films are closely related to the molecular orientation within the layer. Some of the techniques used to analyse the structure of the floating and transferred layers are discussed in this short review, with special reference to phthalocyanine films     

相移干涉计量中相移器的原路相干相位检测标定

介绍一种原路相干相位检测的标定方法,该方法具有很高的精度,对相移器的线性没有特别要求,相移器的标定与使用是同一光路,消除了标定光路与使用光路不同所带来的误差     

Optical backplane system using waveguide-embedded PCBs and optical slots

As discussed in this paper, a practical optical backplane system was demonstrated, using a waveguide-embedded optical backplane board, processing boards, and optical slots for board-to-board interconnection. A metal optical bench was used as a packaging die for the optical devices and the integrated circuit chips in both the transmitter and the receiver processing boards. The polymer waveguide was produced by means of a hot-embossing technique and was then embedded following a conventional lamination processes. The average propagation loss of these waveguides was approximately 0.1 dB/cm at 850 nm. The dimension and optical properties of the waveguide in an optical backplane board were unchanged after lamination. As connection components between transmitter/receiver processing boards and an optical backplane board, optical slots were used for easy and repeatable insertion and extraction of the boards with a micrometer-scale precision. A 1/spl times/4 850-nm vertical-cavity surface-emitting laser array was used with 2 dBm of output power for the transmitter and a p-i-n photodiode array for the receiver. This paper successfully demonstrates 8 Gb/s of data transmission between the transmitter processing board and the optical backplane board.     

倾斜底涂法制备聚苯乙烯胶体晶体及其光学特性研究

采用倾斜底涂法将单分散的聚苯乙烯胶体微球自组装生长成为胶体晶体,并用扫描电子显微镜和紫外-可见光分光光度计对其形貌和光学特性进行测量。结果表明,聚苯乙烯微球自组装为面心立方密堆积结构,胶体晶体的光子带隙位于可见光波段。分别对不同胶体颗粒的粒径、悬浮液的浓度、基片倾斜角度及环境温度等制备条件下生成的聚苯乙烯光子晶体样品逐一分类对比,分析了影响光子带隙宽度和深度的因素。     

Self-assembly for microscale and nanoscale packaging: steps toward self-packaging

The packaging of microelectromechanical systems (MEMS) and nanoscale devices constitutes an important area of research and development that is vital to the commercialization of such devices. Packaging needs of these devices include interfaces to nonelectronic domains; integration of structures, devices, and subsystems made with incompatible fabrication processes into a single platform; and the ability to handle a very large numbers of parts. Although serial, robotic assembly methods such as pick-and-place have allowed significant manufacturing feats, self-assembly is an attractive option to tackle packaging issues as the size of individual parts decreases below 300 /spl mu/m. In this paper, we review advances made in the usage of self-assembly for packaging and potential directions that growth in this area can assume. In the micrometer scale, we review the use of capillary forces, gravity, shape recognition, and electric fields to guide two- and three-dimensional self-assembly processes. In the nanoscale, we survey the usage of self-assembled molecular monolayers to solve current packaging issues, DNA hybridization for guiding self-assembly processes of nanoscale devices, and methods used to package nanowires or nanotubes into electronic circuits. We conclude with an example of a nanoscale biosensor which directly incorporates the concept of its package into its fabrication process. Even though the idea of a fully self-packaging system has not been demonstrated to date, the body of work reviewed and discussed here presents a solid foundation for the pursuit of this goal.     

Technique for jointing small-core optical fibres

A simple technique for making permanent joints between optical fibres is described. The technique is suitable for small-core fibres, as well as those in which the core is not well centred in the cladding. Because the precision components required to make the alignment are reused, the cost per joint is low.     

双光频梳辅助的微波频率测量方法北大核心CSCD

为实现大频率范围内多微波频率的高精度即时测量,提出了一种基于双光频梳和法布里-珀罗滤波器(Fabry-Perot filter,FPF)的微波频率测量方案。将待测微波信号通过单边带调制加载在一路光频梳上进行频率复制,再将调制后的光信号通过一个法布里-珀罗滤波器进行信道分割。FPF的输出信号和另一路光频梳耦合后通过光解复用器实现信道化接收。通过设置合适的系统参数,可使得每个信道输出的拍频信号在同一窄带中频频段内。基于频率-光功率映射的原理,通过判断信号的存在性即可确定未知信号所处的频率段,实现信号频率的粗估计。通过对目标信道输出的微波信号进行采样、模数变换和信号处理可实现未知信号频率的高精度测量。通过实验仿真验证了所提方案的有效性,频率测量误差在±2.5 MHz内。     

锗光楔角度精密测量的一种新方法

本文依据锗光楔角度测量的特点 ,提出了锗光楔角精密测量的一种新方法 ,利用微机控制下的细分驱动 ,并采取搜索逼近的方法自动完成对楔然的测量。该测量装置结构紧凑 ,传动误差小 ,亦可作为一般光学玻璃的角度测量和分度使用。     

一种提高悬臂粱振动参数测量技术的研究

正弦相位调制干涉测量技术是一种高精度光学测量技术,可用于MEMS振动、振动分布、位移等物理量的测量。本文提出一种提高悬臂粱振动参数测量精度的方法,并分析了测量原理。该方法通过反馈控制回路消除了外界干扰和光强调制对测量精度的影响,并以纳米精度对悬臂粱的振动进行了检测,可得到悬臂粱在光激励下发生振动的相关振动特性参数。