LD泵浦的946nm Nd:YAG激光器及腔内倍频473nm蓝光输出

本文偷 准三能级系统９４６ｎｍＮＤ：ＹＡＧ固体激光器室温运转的条件及实现方法,并给出腔内倍频获得４７３ｎｍ蓝光发射的方案,用波长８０８．５ｎｍ,功率２Ｗ的半导体激光器泵浦Ｎｄ：＾ＡＧ,采用腔内插入高损耗元件选模的方法,在室温下获得９４６ｎｍ波长连续红外激光输出１８０ｍＷ,斜效率１３５;用ＢＢＯ和ＬＢＯＪ晶体腔内倍频,获得４７３ｎｍ波长连续蓝色激光,输出功率分别１２ｍＷ和５０ｍＷ,斜效率分别为３％及     

LD泵浦的声光调Q腔内倍频激光器

研制成用ＬＤ泵浦的声光调Ｑ的Ｎｄ：ＹＶＯ４－ＫＴＰ腔内倍频激光器，得到了ＴＥＭ００模、频率高达１００ｋＨｚ的稳定的５３２ｕｍ绿激光脉冲系列输出，阈值泵浦功率为２７ｍＷ；在连续５７０ｍＷ的泵浦功率下，绿激光脉冲的峰值功率达１１００Ｗ，脉宽为４．６ｕｓ；输出功率稳定，在±５℃的工作温度变化下，输出功率变化小于±２％。此种器件可望得到广泛的应用。     

大功率半导体激光侧面泵浦Nd：YAG板条激光器

用准连续６０Ｗ半导体激光侧面泵浦Ｎｄ：ＹＡＧ板条激光器，获得单脉冲能量３．５ｍＪ的激光输出，脉冲重复频率１～１００Ｈｚ，能量输出起伏小于±１％，光－光效率为１５％，斜效率为２９％。实现了声光调Ｑ、电光调Ｑ、ＢＤＮ染料和ＬｉＦ色心晶体被动调Ｑ的激光输出，最大峰值功率超过１００ｋＷ。     

半导体激光泵浦固体激光器锁模获得成功

半导体激光泵浦固体激光器锁模获得成功本文报道ＬＤＡ侧面泵浦Ｎｄ：ＹＡＧ板条激光器声光主动锁模、调Ｑ锁模和预激光调Ｑ锁模的研究结果。泵浦光源准连续输出最大平顶峰值功率约６０Ｑ，Ｎｄ：ＹＡＧ板条几何尺寸为１６．２×２×２ｍｍ３，板条两端平行切成布儒斯特角...     

晶体温度对L泵浦Nd：YVO_4／KTP腔内倍频激光器输出的影响

研究了ＬＤ泵浦Ｎｄ：ＹＶＯ４／ＫＴＰ腔内倍频激光器中激光晶体与倍频晶体的温度对器件基频与倍频输出的影响。用国产１Ｗ激光二极管作泵浦源,通过选择合适的Ｗｄ：ＹＶＯ４和ＫＴＰ的工作温度,在泵浦功率为６０４．２ｍＷ时获Ｔ得１３３．６ｍＷ的绿光输出,光－光转换效率为２２．１％。     

全固化Nd：YVO4绿光激光器

本文介绍了一种新型微型全固化绿光激光器。采用激光二极管端面泵浦Ｎｄ：ＹＶＯ４激光晶体，用ＫＴＰ作为非线性倍频晶体，当泵浦光功率为３６０ｍＷ时，获得５３０ｎｍ波长、９．３ｍＷ的基横模绿光输出，总的光－光转换效率为２．４％。     

激光二极管直接耦合泵浦的Nd：YVO_4激光器连续运转和高重复率被动调Q运转

以５００ｍＷ激光二极管直接耦合泵浦Ｎｄ：ＹＶＯ４，实现了１０６４ｎｍ连续激光运转。泵浦阈值功率约２２ｍＷ，获得基横模最大输出约１７２ｍＷ，相应的斜效率为３５．８％；在Ｎｄ：ＹＶＯ４激光谐振腔内采用Ｃｒ４＋：ＹＡＧ作为饱和吸收体，实现了激光二极管连续泵浦Ｎｄ：ＹＶＯ４高重复率被动调Ｑ激光运转。获得了脉宽约１１４ｎｓ的１０６４ｎｍ调Ｑ激光脉冲，重复率高达３８０ｋＨｚ。     

连续钛宝石激光器长波段调谐的实验研究

本文主要报导用钛宝石进行长波段激光调谐的实验结果。钛宝石晶体（φ４×１１．５ｍｍ）置于四镜Ｚ形驻波腔内，由氩离子激光器全线轴向泵浦，激光波长由石英双折射滤光片调谐。在８Ｗ功率泵浦时，钛宝石激光器调谐范围是９０１．６ｎｍ到１０００．０ｎｍ；当泵浦功率为８．９Ｗ时，１００５．０ｎｍ处激光输出超过１５ｍＷ．９８０ｎｍ处钛宝石激光器的阈值为６．６Ｗ，斜率效率为３．７％；当泵浦功率为１０．５Ｗ时，激光连续输出达１５５ｍＷ。同时还对实验结果和双折射调谐器的设计进行了分析。     

LD泵浦Nd：YVO_4激光器的基横模、高重复频率声光调Q

用国产激光二极管，实现了连续泵浦Ｎｄ：ＹＶＯ４激光器声光调Ｑ．以及单纵模预激光调Ｑ输出。在较小的泵浦功率下．得到了２．４％的光－光转换效率，斜效率为１２．５％，脉冲宽度为６０ｎｓ，激光为基横模输出．将实验结果与ＬＤ泵浦Ｎｄ：ＹＡＧ激光器进行了比较．     

三明治腔结构的Nd:YVO_4激光器

报道了一种三明治腔结构（Ｓａｎｄｗｉｃｈ－ｔｙｐｅｒｅｓｏｎａｔｏｒ）的ＮｄＹＶＯ４全固态激光器。用发射波长８０６ｎｍ的光纤耦合二极管激光器（ＬＤ）泵浦ＮｄＹＶＯ４晶体，泵浦光功率为７Ｗ时获得１．０６４μｍ连续波（ＣＷ）ＴＥＭ００模最大输出功率为３．７Ｗ，光学斜效率为６２％；将ＫＴＰ放入腔内倍频，当泵光为５．６Ｗ时，获得ＣＷ绿光输出６２０ｍＷ。光－光转换效率达１１％。     

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