利用双相光栅的激光束相干合成

本文介绍一种采用纯双相光栅进行激光束相干相加的方法。用一光栅能把单一光束高效率地分离成N个相等级次激光束,亦能以相同效率把N个相等级次的激光束转换成单一光束。实验证明,它能以75％的总转换效率将七束激光转换成一个单束激光。本文还描述一种实验装置,将两束氦-氖激光与三束氦-氖激光(波长为3.39μm)的功率合成,其效率可高达83％。     

ICP-AES法直接测定重晶石中的Ca、Sr、Fe

通过碳酸钠高温熔样，热水浸取过渡除去SO4^2-和Na^2 ，酸化溶解沉淀的方法处理样品，采用ICP－AES法测定重晶石中的杂质元素钙、锶、铁，方法的检出限为3．9－8．4ng／mL，回收率为99．4％－100．3％，精密度为1．1％－1．4％。该方法快速、简便，在重晶石日常检测中具有重要的实际意义。     

波长色散X射线荧光光谱法测定黄金饰品含金量

本文提出应用波长色散Ｘ射线荧光光谱仪测定黄金饰品含金量的方法，本法对原有样品盒进行了改造，增设特制窗口和采取样品固定等措施，以系列参考标样建立校准曲线，用经验系数法校正基体效应。比例模拟法校正含量。９个参考标样和１６个金标牌的测定结果表明，在含金量为３７．５０％－９９．９９％的范围内，方法的准确度好：含金量在９９．９９％－９８．９８％范围时，误差为０．０３％－０．１２％，在９８．９８％－３７．５０％范围时，误差为０．０１％－０．５２％，选用含金量不同的５个参考标样为代表，以０．７和１．４的模拟比例，经不同时间多次测定进行统计，相对标准偏差为０．０５％－０．５０％，说明方法的精密度好，本法操作方便，时样品无破坏     

基于条纹级次编码与调制的结构光相位展开算法

利用相位级次的编码和调制方法将相位级次信息叠加到相移图像中,提出了一种直接利用相移图像进行相位解包裹的方法。在投影端,提出了一种邻接不重复德布鲁因序列,并用该序列对相位级次进行编码,然后将该周期级次编码序列调制、叠加到多步相移图像中。相应地,在解码阶段,从拍摄到的相移图像中同时解调、分解出包裹相位和周期级次编码序列,通过序列的匹配还原真实周期级次信息,并最终准确地解包裹出绝对相位。以四步相移法为例,本文方法相比传统的时间相位解包裹算法,投影图片从10张(64个相位周期)缩减到了4张,提高了测量效率。     

位相光栅的衍射级次

用矢量衍射理认讨论了位相光栅衍射级次的有限性及其与入射角的关系，得出的吉论与用光程方法得出的结果一致，作出了在不同入射角条件下各衍射级次的分布图，给出了求解各级衍射波方向的公式。     

氢化物-原子荧光光谱法测定建筑用粘合剂中汞

用硝酸－硫酸－高锰酸钾在高压锅中溶样，采用氢化物发生原子荧光光谱法测定建筑用粘合剂中汞。相对标准偏差为4．3％，回收率为87．6％－106％。该方法快速、简单、准确。     

ICP-AES法测定铝合金中的Sc

本文采用ICP－AES法测定铝合金中的Sc，并讨论了基体元素及共存元素对Sc的干扰，进行了酸度试验，采用盐酸和硝酸溶解试样，回收率为96．0％－101．0％，RSD为0．31％－0．59％，方法简便，可靠，可获得满意的分析结果。     

石墨炉原子吸收法测定化妆品中的铅和砷

本文研究了石墨炉原子吸收法测定化妆品中铅、砷的方法。用湿式消解法消化样品，易掌握。方法简便，灵敏度高。用本方法测定铅的检出限为０．０１０ｎｇ，砷的检出限为０．０１３ｎｇ，相对标准偏差为０．８％－５．２％，方法的回收率为９６．１％－１０５．８％。     

小白鼠组织和骨中铜锌铁钙镁的测定

本实验利用原子吸收光谱法对小白鼠组织及骨中Ｃｕ，Ｚｎ，Ｆｅ，Ｃａ，Ｍｇ含量进行了测定。样品采用浓ＨＮＯ２和ＨＣｌＯ４湿法消化，并用国家计量局的猪肝（ＧＢＷ０８５５１）作为标准物对测定方法进行了考核，测定值与标准值吻合。方法加收率：Ｃｕ９９－１００％，Ｚｎ１０２－１０３％，Ｆｅ９９－１００％，Ｃａ９９－１０４％，Ｍｇ１０１－１０３％，ＣＶ值为１．７－３．９％。方法简便，快速，准确度高，需样量少，符合     

ICP-AES法测定生物组织中微量铜

研究了阿司匹林铜药物代谢动力学实验中小白鼠肝、脑肾、脾和血内微量铜的ＩＣＰ－ＡＥＳ测定方法，该方法简便、快速、回收率为９６％－１０６％，相对标准偏差为１．５％－６．８５％。     

Femtosecond Transform-Limited Pulse Generation by Compensating for the Linear Chirp of SPM Spectra in Dispersion Shifted Fibers

A simple technique of pulse compression, based on the linear chirp compensation of self-phase modulation (SPM) spectra in dispersion shifted fibers, is demonstrated. The optimization procedure is carried out, for a short span of a single-mode fiber, using a parabolic law, which describes the behavior of the squared output pulse width versus the pump peak power in the case of Gaussian pulses. The experimental results give a minimum pulse duration of 233 fs, which is in good agreement with the model. Shorter and coherent pulses, down to 90 fs, have been obtained by inserting an interference filter at the optical output.     

Sorting of bending magnets for the SSRF booster

The Shanghai Synchrotron Radiation Facility(SSRF)booster ring,a full energy injector for the storage ring,is deigned to accelerate the electron beam energy from 150MeV to 3.5GeV that demands high extraction efficiency at the extraction energy with low beam loss rate when electrons are ramping.Closed orbit distortion(COD)caused by bending magnet field uniformity errors which affects the machine performance harmfully could be effectively reduced by bending magnet location sorting.Considering the affections of random errors in measurement,both ideal sorting and realistic sorting are studied based on measured bending magnet field uniformity errors and one reasonable combination of bending magnets which can reduce the horizontal COD by a factor of 5is given as the final installation sequence of the booster bending magnets in this paper.     

Soliton squeezing generated in an all-fiber contiguration

We experimentally demonstrate amplitude squeezed soliton utilizing intensity-dependent self-phase modulation in an asymmetric Sagnac interferometer.The system.whose components are connected via ferrule connector/physical connection(FC/PC)fiber connectors,constitutes all-fiber configuration to generate squeezed soliton.Soliton amplitude reduction measured by homodyne detection is near 4.0 dB below the shot-noise level.Optimal squeezing fields in both simple and compact all-fiber configuration are obtained.     

Propagation of light in(2+1)-dimensional nonlinear optical media with spatially inhomogeneous nonlinearities

The(2 1)-dimensional nonlinear Schr(o)dinger(NLS)equation with spatially inhomogeneous nonlinearities is investigated,which describes propagation of light in(2 1)-dimensional nonlinear optical media with inhomogeneous nonlinearities.New types of optical modes and nonlinear effects in optical media are presented numerically.The results reveal that the regular split of beam can be obtained in (2 1)-dimensional nonlinear optical media with inhomogeneous nonlinearities,by adjusting the guiding parameter.Furthermore,the stability of beam regular split is discussed numerically,and the results reveal that the beam regular split is stable to the finite initial perturbations.     

A novel pose and illumination robust face recognition with a single training image per person algorithm

In the real-world application of face recognition system, owing to the difficulties of collecting samples or storage space of systems, only one sample image per person is stored in the system, which is so-called one sample per person problem. Moreover, pose and illumination have impact on recognition performance. We propose a novel pose and illumination robust algorithm for face recognition with a single training image per person to solve the above limitations. Experimental results show that the proposed algorithm is an efficient and practical approach for face recognition.     

Testifying experiment of the multi-pulse phenomena of capillary discharge soft-X-ray laser

In a capillary discharge experiment for the neon-like argon lasing, we have proposed an experimental scheme to verify that the multi-spike of X-ray diode (XRD) signal is a multi-pulse laser or is a reflection of the laser pulse in the XRD.The ceramic capillary has an inner diameter of 3mm and a length of 200mm.At the gas pressure of 28Pa and discharge current of 27kA, stable lasing has been realized.The experimental results prove that the multi-spike of XRD signal is a reflection of the electromagnetic signal produced by the laser pulse in the XRD.The improved electrocircuit scheme of the XRD to minimize the reflection phenomena is also found.     

Optical system and lens design for Blu-ray disc optical pick-up

During the design process of Blu-ray disc optical pick-up (BD OPU), the optical system and the collimator lens design is especially important. This paper designs an optical system and some lenses for the BD OPU, including collimator lens, beam shaping lens for laser beam shaping, and cylinder lens for signal detecting. In this OPU, we use a triplet lens to collimate the laser beam. At the same time, we build a series of assembly jigs to make sure that each lens can be put into the OPU basement properly. At last, we get the reading spot image and S-curve photo of OPU, which can be used to read Blu-ray disc (BD).     

Stable anticipation synchronization in mutually coupled vertical-cavity surface-emitting lasers system

Two vertical-cavity surface-emitting lasers(VCSELs) are mutually coupled through a partially transparent mirror (PTM) placed in the pathway. The PTM plays the role of external mirror,which controls the feedback strength and coupling strength.We numerically simulate this system by establishing a visible SIMULINK model.The results demonstrate that the anticipation synchronization is achieved and it can tolerate some extent frequency detuning.Moreover,the system shows similar chaos-pass filtering effect on unidirectionally coupled system even both VCSELs are modulated.This system allows simultaneously bidirectional secure message transmission on public channels.     

Terahertz optical asymmetric demultiplexer based tree-net architecture for all-optical conversion scheme from binary to its other 2n radix based form

To exploit the parallelism of optics in data processing,a suitable number system and an efficient encoding/decoding scheme for handling the data are very essential.In the field of optical computing and parallel information processing,several number systems like binary,quaternary,octal,hexadecimal,etc.have been used for different arithmetic and algebraic operations.Here,we have proposed an all-optical conversion scheme from its binary to its other 2n radix based form with the help of terahertz optical asymmetric demultiplexer (TOAD) based tree-net architecture.