非稳腔1.06μm激光输出喇曼频移实验研究

本文报道了1.06μm非稳腔激光输出经高压甲烷喇曼频移的实验研究结果。重点比较了喇曼激光和1.06μm泵浦激光的光束质量。     

1.54μm腔内喇曼激光器实验研究

喇曼激光器作为一种将基波频率转换成斯托克斯频率的高量子效率转换装置,实现激光频率的扩展,日益受到人们的重视。腔外喇曼频移过程,国内、外都有过充分的研究,而腔内喇曼频移激光器投入实际使用则只是近几年才发展起来。本文报道了脉冲Nd:YAG1.06μm基频经高压甲烷气体在封闭式激光腔内喇曼频移成1.54μm一阶斯托克斯脉冲输出的实验研究结果。     

重频双波长输出(Nd,Ce):YAG喇曼频移激光器研究

通过实验对高重频喇曼双波长激光器的关键技术进行了详细的研究,成功地实现了频率为15Hz,1.54μm/1.06μm混合激光输出脉冲能量达20mJ的双波长喇曼激光输出。     

重频双波长输出(Nd,Ce)∶YAG喇曼频移激光器研究

通过实验对高重频喇曼双波长激光器的关键技术进行了详细的研究,成功地实现了频率为15Hz,1.54μm/1.06μm混合激光输出脉冲能量达20mJ的双波长喇曼激光输出.     

视力无害激光测距仪

最近,瑞典爱立克森雷达电子设备公司研制出一种对视力无害的新型激光测距仪,它采用喇曼频移技术,使用1.54μm波长,重复率高。它用喇曼频移的掺钕钇铝石榴石(Nd:YAG)发射机,将1.06μm脉冲发送到充填高压甲烷气体的管子一端。甲烷分子吸收该辐射后,发射1.54μm波长的光子。这种辐射被眼球前部吸收,而不是聚焦在视网膜上。 该装置配用于海军和陆军防空火控系统。     

甲烷受激喇曼散射的研究

本文报导0.532μ激光泵浦甲烷(CH_4)的受激喇曼散射(SRS)的实验结果。实验采用调Q Nd:YAG倍频器件作泵浦源。激光能量30mJ, 脉宽8ns,束发散度1mrad,直径2mm,线偏振光输出。泵浦光经透镜聚焦进入喇曼池,池长42cm,直径1.5cm,内充色谱纯甲烷介质。 实验研究了气压参数对甲烷SRS的影响关系,     

输出功率达1W以上的Nd：GdVO4喇曼激光器

人眼安全的激光器在遥感、遥测及军事应用（如测距、目标指示）中日益受到关注．台湾National Chiao Tung大学已研制出一种Nd：GdVO4喇曼激光器，在该激光晶体中利用受激喇曼散射，并将输出波长从．1．34μm位移到1．52μm的人眼安全波长。     

连续调谐波导型H_2受激振动喇曼散射的研究

设计和研制了一台石英毛细管波导型H_2喇曼池,用450nm染料激光研究了H_2的受激振动喇曼散射,测定了一阶Stokes波输出能量与H_2气压之间的依赖关系。最高能量转换效率为20％。用Oxazine-1染料激光作泵浦源获得三阶Stokes信号,得到的红外喇曼散射最长波长达6.57μm。     

喇曼频移激光器的光损伤研究

报道了在内腔复合镜输出方式工作下的高压甲烷气体(Nd,Ce):YAG喇曼频移激光器光损伤机制的理论分析及实验结果,提出了高重复频率工作下喇曼频移激光器解决光损伤的设计方案。     

纯硅材料喇曼激光器及硅芯光纤的研究进展

硅材料在1.2～6.6μm波段有高透明和高喇曼增益的特性,易于在室温条件下激发出近中红外波段喇曼激光.详细阐述了硅激光的非线性转换效率的问题.介绍了采用纯硅材料作为增益介质的喇曼激光器的研究进展,并对研究现状进行了报道.预测硅芯光纤将作为新型大功率近中红外的喇曼激光器的增益介质.     

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.     

Development of the readout system for waveguide multilayer optical card

Waveguide multilayer optical card （WMOC） is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling ＆ processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic （VB） language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.     

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.     

Collinear phase-matching study of terahertz-wave generation via difference frequency mixed in GaAs and Inp

The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching, the optimum phase-matching wave hands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and lnP are 0.95-1.38μm and 0.7-0.96μm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.     

Effects of the alloy compositions on the phonon-polaritons in ternary mixed crystals

Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.     

New insert layer structure OLEDs

An insert layer structure organic electroluminescent device（OLED） based on a new luminescent material （Zn（salen）） is fabricated. The configuration of the device is ITO/CuPc/NPD/Zn（salen）/Liq/LiF/A1/CuPc/NPD/Zn（salen）/Liq/LiF/A1. Effective insert electrode layers comprising LiF（1nm）/Al（5 nm） are used as a single semitransparent mirror, and bilayer cathode LiF（1 nm）/A1（100 nm） is used as a reflecting mirror. The two mirrors form a Fabry-Perot microcavity and two emissive units. The maximum brightness and luminous efficiency reach 674 cd/m^2 and 2.652 cd/A, respectively, which are 2.1 and 3.7 times higher than the conventional device, respectively. The superior brightness and luminous efficiency over conventional single-unit devices are attributed to microcavity effect.