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207自泵浦相位共轭中的温度与混沌态罗毅(西北大学中国西安710069)吕光爵(美麻州大学洛尔分校M.A.01854)光折变晶体BaTiO_3中实验测量了自泵浦相位共轭(SPPC)输出与温度的关系,发现当温度超过82℃后,自泵浦相位共轭输出出现混沌。... 相似文献
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《激光与光电子学进展》1995,(6)
利用光折变晶体Cu:KNSBN中的自泵浦相位共轭实现图象识别及其动态现象一、引言_相位共轭镜的一个重要应用是实现联想存储操作。BaTiO3和SBN这类光折变晶体具有强非线性,所以在各种应用中能广泛用作自泵浦相位共轭[1,2]。不久前,Liu报导了在光... 相似文献
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光折变晶体特别是光折变效应极强的钛酸钡晶体的出现,使人们在获得简便而又高效的 相位共轭反射镜方面有了新的突破。人们利用这种具有极低功率响应的光折变晶体,运用它 的自泵浦相位共轭效应,已获得反射率为30%—50%的相位共轭波输出。本文具体报导了在 钛酸钡晶体中,最佳利用普克尔斯系数λ_(42)的一种相位共轭镜设计。对常规BaTiO_3晶体相 位共轭反射镜,由于BaTiO_3晶体本身的折射系数很大(n=2.42),至使外界入射光束不可 能在晶体内折射后,在晶体内的传输光束能与晶轴正C方向成45°角配置(BaTiO_3的内全反 相似文献
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掺铑钛酸钡晶体是一种近年来生长成功的光折变晶体。人们对它的光折变性质如二波耦合、相位共轭、光致吸收等都做过很多研究。但关于其光折变性质随温度的变化尚未见报导。本文中我们对物理所生长的掺铑钛酸钡晶体的光折变性质对温度的依赖性进行了研究,发现其二波耦会强度及其相位共轭反射率随温度的升高而增加。在二波耦合实验中,我们用He-Ne激光器作光源,为消除强的扇光而采用o光偏振,两束对称入射(晶体外夹角2θ=18°)。泵浦光强度为0.36W/cm2,泵浦光与信号光的强度比为为20,测得二波耦合强度随温度线性增加,当温度从20℃… 相似文献
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本文讨论了在光折变晶体中,通过特殊的背向受激二波混频产生自泵浦相位共轭波的理论,并指出散射波的频偏是由于极化光折变晶体中的光生伏打效应引起相位栅的运动而产生的。 相似文献
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用自泵浦相位共轭实现全光型半加器逻辑操作 总被引:2,自引:0,他引:2
通过对KNSBN:Cu光折变晶体的自泵浦相位共轭(SPPC)和诱导自泵浦相位共轭(ISPPC)特性的研究,分别利用SPPC和ISPPC实现了XOR逻辑操作和AND逻辑操作,并将SPPC和ISPPC有机组合实现了全光型半加器逻辑操作。 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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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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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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《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