共查询到20条相似文献,搜索用时 62 毫秒
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激光聚变装置光束自动准直系统的研究进展 总被引:12,自引:3,他引:12
光束自动准直系统应用于惯性约束聚变的高功率激光装置,研究了光束自动准直的原理和关键技术,介绍了国外光束自动准直系统的发展状况,展望了高功率激光装置自动准直系统的未来发展趋势。 相似文献
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以降低激光实时监测系统基准点光束漂移为目标,提出了基于LabVIEW的激光实时监测系统.利用激光实时监测装置采集监测信号,LabVIEW软件编程获取基准点与光斑中心偏差量,利用调整光束水平以及垂直方向偏移量实现激光光束自动准直,利用监测信息存储模块缓存以及寄存监测信息,利用多媒体接口接收监测信息存储模块输出监测信息.系... 相似文献
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南京航空学院激光自动机研制小组 《中国激光》1974,1(2):44-49
中距离(0~40米)空间定位是航空工业的一项重要技术关键, 现有方法存在较多问题,激光自动准直技术是解决这一关键的有效方法.我们与有关工厂协作所研制的激光自动准直系统通过试验表明,其静态准确度达到了±0.1毫米(试验距离0~27米).这种激光自动准直系统也可用于其他工业部门.本文介绍了激光自动准直系统的原理、静态准确度分析和试验结果、激光束的飘移. 相似文献
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为了实现半导体激光器的光束准直,分析了半导体激光器光束沿快、慢轴方向的准直原理。采用单个半导体激光器作为被准直单元,提出了基于像散曲面微透镜的半导体激光器光束准直方法。讨论了半导体激光器填充因子对像散曲面微透镜准直性能的影响。对填充因子0.5的半导体激光器进行模拟验证。准直后,快轴方向剩余发散角约为0.34,慢轴方向剩余发散角约为2.69。结果表明,像散曲面微透镜不但可以对高填充因子的半导体激光器光束进行准直,而且准直后出射光斑面积小。该研究为高功率半导体激光器堆栈光束的准直提供了可行性方案。 相似文献
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本文利用高斯光束传输特性,在水下激光成像的特定条件下,提出了设计准直器的一种新方法和最优化设计方案,并给出了最优化的流程图。计算了高斯光束通过准直器的象差,并 同步扫描水下激光成像系统准直器的设计实例。 相似文献
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双半圆柱透镜准直半导体激光光束 总被引:12,自引:5,他引:7
柱透镜被广泛运用于准直半导体激光光束,而普通圆柱透镜准直能力并不高,为了克服这一不足,提出一种新的柱透镜结构:双半圆柱透镜(DHCL);基于光线传输理论导出该结构柱透镜准直激光光束的基本公式并给出数值模拟的结果。理论分析和数值模拟均表明:在用于准直半导体激光器输出光束方面,双半圆柱透镜突破了普通圆柱透镜在最佳准直时对透镜材料折射率的限制,提高了结构设计和材料选择的灵活性;特别是在高折射率条件下,双半圆柱透镜对光束的准直能力远远超过了普通圆柱透镜。理论上可以将半导体激光光束快轴方向发散角压缩到0.1 mrad的量级。 相似文献
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针对影响信号光束宽度最优化设计的三个最重要因素进行了讨论:一是系统的跟瞄精度,二是光学准直系统的准直能力,三是大气湍流效应对激光大气传输造成的光束弯曲、偏折、漂移等现象对系统的影响。 相似文献
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Michael Reilly 《半导体技术》2004,29(12)
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. 相似文献
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Thomas M.Trexler 《半导体技术》2004,29(5)
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. 相似文献
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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. 相似文献
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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. 相似文献
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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. 相似文献
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Qi-jiang Ran Pei-de Han Yu-jun Quan Li-peng Gao Fan-ping Zeng Chun-hua Zhao 《光电子快报》2008,4(4):239-242
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. 相似文献
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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. 相似文献
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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. 相似文献
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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. 相似文献
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《中国通信》2014,(7)
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 相似文献