重复频率40Hz高能量倍频调Q Nd：YAG激光器

在对圆棒形ＹＡＧ棒内热效应进行详细分析的基础上，报导了一种闪光灯泵浦、调Ｑ倍频ＹＡＧ激光器。当重复频率为４０Ｈｚ时，１．０６４μｍ最大单脉冲能量为４６２ｍＪ，０．５３２μｍ最大单脉冲能量为２５０ｍＪ；当每秒一次工作时，０．５３２μｍ激光能量为３８０ｍＪ／脉冲，倍频效率大于６９％。     

高效铜激光倍频及在光刻中的应用

通过线聚焦将自滤波振荡行波放大后的铜激光在ＢＢＯ晶体中信频，当基频光功率为５．４Ｗ时，倍频效率达１４．４％。用钢激光倍频光进行接触式光刻，刻线分辨率优于１．０μｍ。     

调QNd∶YAG脉冲激光在LiIO_3中倍频的应力波

当调ＱＮｄ∶ＹＡＧ脉冲激光通过ＬｉＩＯ３晶体时，由于晶体弱吸收激光而在其内激起应力波。在激光倍频时这种波得到增强，并随倍频的位相失配角变化。研究表明，这是因为激光倍频时部分１０６４μｍ的基频激光转换成０５３２μｍ的倍频光，并且ＬｉＩＯ３晶体吸收倍频光比吸收基频光更强。     

激光二极管泵浦的1.34μm及其腔内倍频红光Nd: YVO_4激光器

报道了激光二极管泵浦的１．３４μｍＮｄＹＶＯ４激光器，利用ＫＴＰ晶体腔内倍频，实现了６７０ｎｍ红光输出。计算了ＫＴＰ在１．３４μｍ的倍频参数，分析并提出了提高腔内倍频效率的有效途径。     

LD泵浦的Nd：MgO：LiNbO_3单晶光纤腔外倍频激光器

通过镁离子内扩散方法．实现了沿α轴生长的Ｎｄ：ＭｇＯ：ＬｉＮｂＯ３单晶光纤具有阶跃折射率分布的芯－包层波导结构。并研制成ＬＤ泵浦的该包层单晶光纤室温腔外倍频激光器，在１９ｍＷ的１．０６４μｍ入射光功率下，得到１０μＷ的０．５３２μｍ的连续绿光输出。     

神光装置φ200mm口径KDP晶体高功率倍频激光系统

报道了φ２００ｍｍ口径ＫＤＰ晶体高功率倍频激光系统的研制结果，并实现了神光装置信频激光打靶。五十枪次全口径打靶实验表明，倍频激光系统性能稳定。实验中，当入射基频激光强度大于１．５ＧＷ／ｃｍ２，倍频器的外部转换效率保持在６０％以上。最大入射基频激光能量为３５７．８Ｊ时，输出倍频激光能量为２２３．４Ｊ，倍频转换效率为６５．６％。     

可调谐TEA CO2激光在AgCaSe2中的倍频

在一台小型ＣＯ２激光器上采用光栅调谐的方法获得了从９．２３￣１０．６４μｍ范围的多线输出。其中７条最强的谱线用非线性光学晶体ＡｇＧａＳｅ２实现了二次谐波转换。在基波聚焦情况下，用一片优质的１４ｍｍ长的晶体，获得了Ｒ（１４）跃迁１０．２８８μｍ的２６％倍频能量转换效率。     

β—B_aB_2O_4晶体环形腔内倍频调谐性质测量与分析

报导连续波环形染料激光器内腔ＢＢＯ（β—ＢａＢ２Ｏ４）晶体倍频外调谐角改变量与匹配波长改变量关系的实验结果。测得面Δθｍ／Δλｍ～０．１２°／ｎｍ与理论基本一致。     

应用于腔内倍频系统的高精度温控系统

在高平均功率激光倍频系统中,非线性倍频晶体吸收剩余能量后温度急剧变化,可能导致相位匹配条件破坏,极大程度地减小倍频转换效率.为了获得高效稳定的倍频输出,研制了一种恒温控制系统,该系统采用新型集成温度传感器AD590探测晶体温度,半导体制冷器调节温度,系统温度精度达0.1℃.     

优质KTP晶体腔内有效倍频效率及损耗的研究

本文报道一种高效内倍频Ｎｄ：ＹＶＯ４／ＫＴＰ激光器的输出特性以及优质ＫＴＰ晶体腔内有效倍频效率和损耗的研究结果。在泵浦功率为１９Ｗ时获得了５．８５Ｗ的连续绿光输出,相应的光－光转换效率为３０．８％。研究表明,优质ＫＴＰ晶体腔内有效倍频效率超过７０％,最高达到７４．１％;而其损耗仅为０．００７ｃｍ＾－１。     

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.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.     

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