高频方波放电激励扩散冷却CO2激光器的研究

提出了一种新的放电激励技术用于扩散冷却CO2激光器,在5mm×30mm×446mm的放电空间获得均匀稳定的辉光放电及10W的激光输出.     

8 W高功率全固态LD双端抽运连续波绿光激光器

高功率全固态绿光激光器在激光抽运、激光精密加工、激光医学、激光展示、光存储、信息处理、检测等方面有许多应用。Nd∶YVO4 LBO是目前用于产生 5 32nm绿色激光辐射的一组理想晶体组合。本实验小组以 3mm× 3mm× 10mm @0 .5wt . %的Nd∶YVO4晶体为增益介质 ,4mm× 4mm× 15mm ,Ⅰ类非临界相位匹配的LBO为二倍频晶体 ,当抽运功率为 2 8 9W时 ,获得了 8W (已滤除掉 1 0 6 4μm的基频光 )的稳定绿光输出 ,光 光转换效率高达约2 8%。图 1实验装置Fig .1Experimentalsetup　　实验装置采用Z型折叠腔 (见图 1) ,通过数值计算与优化得…     

C波段输出8W的GaAs准单片集成电路

<正>南京电子器件研究所在φ50mm半绝缘GaAs晶片上,采用全离子注入、0.5/μm自对准栅,平面工艺,背面通孔热沉等先进工艺技术,在大大提高单位栅宽的功率密度和增益的基础上,采用CAD设计和内匹配功率合成技术,在C波段(5.5～5.8GHz)测得1dB压缩输出功率大于8W,功率增益大于5dB的准单片功率MMIC。管壳外形尺寸为13mm×12mm;内腔尺寸为6.4mm×8.4mm,远小于富士通公司输出8W产品的内腔尺寸(9.2mm×9.6mm)。 设计中采用微波非线性电路大信号分析方法,使用自行研制的谐波平衡模拟器软件包,进行计算机辅助优化设计,大大缩短了实验周期,减少了实验次数,并通过实验验证了软件的可行性。     

射频激励平板波导-非稳腔CO2激光器的研究

本文报导一个横向射频激励的平板波导CO2激光器。该激光器采用虚共焦非稳腔,其波导尺寸为1.5mm×30mm×400mm,获得133W的激光输出,光电转换效率为11%,发射光束近衍射极限。     

复合Nd∶YAG晶体大功率1064 nm固体激光器研究

报道了采用Comsol多物理场仿真软件模拟计算三种结构Nd∶YAG晶体的温度场分布,并通过实验,对比分析复合晶体与均匀掺杂Nd∶YAG晶体的输出功率和转化效率。模拟结果表明,当泵浦功率为18 W时,尺寸为3 mm×3 mm×10 mm、3 mm×3 mm×16 mm、3 mm×3 mm×20 mm的三种晶体的最高温度分别为97.12 ℃、89.08 ℃和88.01 ℃,复合晶体在降低晶体工作温度,减小热效应方面优势明显。采用相同的工作条件,当泵浦功率为18 W时,均匀掺杂Nd∶YAG晶体1064 nm激光最大输出功率为6 W,16 mm长的复合晶体的输出功率为9.3 W,且未出现饱和现象,光斑质量优于均匀掺杂晶体情况。理论和实验结果表明,复合晶体在降低热效应,提高光斑质量方面具有更高的实用性。     

LD抽运Cr,Nd:YAG倍频输出532 nm绿光

我们用本所生长的掺 0 .0 2 5 at.- % Cr和 0 .5 at.- % Nd的 Cr,Nd:YAG晶体作为激光增益介质 ,在室温下获得了 5 32 nm的绿光输出。实验中所用的 Cr,Nd:YAG晶体的尺寸为 8mm× 8mm× 1 .8mm,Cr4 在 1 .0 6 4μm的吸收系数为 0 .1 44 cm- 1 ,Nd3 在 80 8nm处的吸收系数为 2 .6 cm- 1 。用脉冲 LD作抽运源 ,抽运光波长为 80 8nm,脉冲宽度为 2 ms,重复率为 2 0 0 Hz,输出的最大功率为 2 W,占空比为 5 :1。采用端面抽运方式 ,抽运光直接入射到晶体上。Cr,Nd:YAG晶体的两个面作为激光谐振腔 ,设计为平 -平腔 ,晶体的输入面镀 80 8nm增…     

104 W全固态532 nm Nd∶YAG激光器

我们采用单Nd∶YAG棒平凹谐振腔设计及临界相位匹配的KTP晶体 ,利用内腔倍频技术获得了平均功率为 10 4W的绿光输出。实验装置如图 1。实验采用美国CEO公司生产的半导体激光器组件 ,它由 80个 2 0W二极管激光器组成 ,按照五角形等间距侧面抽运Nd∶YAG棒 ,其总抽运功率为 16 0 0W ,激光介质的尺寸为 6 36mm× 146mm ,侧面打毛 ,两端磨成平面 ,镀 10 6 4nm增透膜。倍频晶体采用Ⅱ类相位匹配的KTP晶体 ( =2 3 6° ;θ=90°) ,其尺寸为 7mm× 7mm× 8mm ,两面镀 10 6 4nm和 5 32nm增透膜 ;考虑到高功率下激光介质Nd∶YAG棒的热致…     

M~2≤1.14的LD抽运的Yb:YAG微晶片激光器

采用国产1W的InGaAs激光二极管(LD),掺杂浓度为10at.-％的Yb:YAG微晶片(φ5mm×0.6mm),室温下获得了输出功率91.5mW,波长1.049μm的基模激光连续输出,光束质量M~2≤1.14,斜率效率为30％。在晶体制冷情况下,获得了111mW的激光输出,斜率效率达40％。     

电源

升压DC/DC转换器X7AH-01FXX0系列非隔离的DC/DC升压转换器的输入为3～5.5V,额定输出为12V/0.8A和15V/0.6A,满载效率为88%,功能包括输入欠压保护、输出电压调节等,并有直插式(17.78mm×7.82mm×16.51mm)和贴片式(19.81mm×17.78mm×8.13mm)两种工业标准的封装。Bel Fuse Inc.http://www.belfuse.com具有Auto-Track功能的电源模块隔离式DC/DC插入电源模块PTB78520W提供两个高电流输出,第一个输出包括软启动以及开/关遥控,第二个输出通过开关转换,使用户可利用Auto-Track功能控制输出电压,输出电流为20A,输入电压为18～60V,输出…     

射频激励宽波导CO2激光器研究

本文报道一种采用射频横向激励的宽皮导CO2激光器。该器件波导尺寸为2mm×30mm×400mm,得到了超过100W的激光输出,光电转换效率约为10%。     

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