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Conference Digest. 2000 International Quantum Electronics Conference (Cat. No.00TH8504)最新文献

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Adaptive image transmission with a pattern forming system 带有模式形成系统的自适应图像传输
M. Schwab, C. Denz
Photorefractive materials are well-suited for pattern observation since their intrinsically slow dynamics offers the opportunity to perform real-time measurements and observations. A single-feedback configuration creating two counterpropagating beams in the nonlinear optical medium gives rise to transverse modulational instability above a certain threshold. This instability generally leads to the formation of hexagonal patterns. In the case of the photorefractive feedback system, patterns of non-hexagonal geometry can be excited by changing the distance between the crystal and the feedback mirror. In addition, the powerful tool of spatial filtering can be applied to manipulate the system in a way that e.g. non-hexagonal patterns become dominant in a parameter region where the hexagon is the natural output of the system. From the point of view of all-optical image processing, this phenomenon can be interpreted as a distribution of a laser beam into an adaptive number of spots with the same intensity. Thus, switches from one to six, four or two channels can be realized. Taking into account higher order terms, other possible configurations of distributing channels are accessible. Our aim is to investigate the prospects of transmitting an image into these self-organized channels. We present experimental results for image transmission of simple geometric figures into the spatial sidebands, proving the principle function of our adaptive image processing system.
光折变材料非常适合于模式观测,因为它们固有的慢动力学提供了进行实时测量和观测的机会。在非线性光学介质中产生两个反向传播光束的单反馈配置在一定阈值以上引起横向调制不稳定性。这种不稳定性通常导致六边形图案的形成。在光折变反馈系统中,可以通过改变晶体与反馈镜之间的距离来激发非六边形几何图形。此外,强大的空间滤波工具可以应用于以一种方式操纵系统,例如,非六边形图案在参数区域中占主导地位,其中六边形是系统的自然输出。从全光图像处理的角度来看,这种现象可以解释为激光束分布为具有相同强度的自适应数量的光斑。因此,可以实现从一个到六个、四个或两个通道的切换。考虑到高阶项,可以访问分布通道的其他可能配置。我们的目的是研究将图像传输到这些自组织通道中的前景。给出了将简单几何图形传输到空间边带的实验结果,证明了自适应图像处理系统的基本功能。
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引用次数: 0
Inhibition of dipolar radiation in a momentum nonconserving nonlinear interaction 动量非守恒非线性相互作用中偶极辐射的抑制
M. Botey, J. Marterell, J. Trull, R. Vilaseca
It has been shown in many occasions that the spontaneous emission rate of a dipolar radiative system can be strongly modified by the environment that surrounds it. Recently, it has been suggested that these changes could also be seen in very simple systems where the radiation is emitted only m one or two directions, as in surface second harmonic generation. In an experiment of SHG in front of a mirror, corresponding to the radiation of a sheet of dipoles at a variable distance from a surface boundary, Kauranen et al. [1998] observed that even when the total rate of radiation was suppressed, the field between the dipolar sheet and the boundary was finite and independent of this total rate. In this work, we have shown that this apparent contradiction can only be explained if the quadratic nonlinear interaction includes terms not conserving momentum, such as the term that considers the transfer of energy from the reflected SHG field to the incident fundamental and vice-versa.
在许多场合已经表明,偶极辐射系统的自发辐射率可以被它周围的环境强烈地改变。最近,有人提出,这些变化也可以在非常简单的系统中看到,其中辐射仅向一个或两个方向发射,如在表面二次谐波产生中。Kauranen et al.[1998]在镜面前的SHG实验中,对应于距离表面边界可变距离的偶极子片的辐射,观察到即使在总辐射率被抑制的情况下,偶极片和边界之间的场也是有限的,与总辐射率无关。在这项工作中,我们已经证明,这种明显的矛盾只能在二次非线性相互作用包含不守恒动量的项时才能解释,例如考虑从反射SHG场到入射基场的能量转移的项,反之亦然。
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引用次数: 0
Towards a deterministic source of cold atoms 走向冷原子的确定性来源
D. Frese, B. Ueberholz, S. Kuhr, W. Alt, D. Schrader, V. Comer, D. Meschede
The interest in optical dipole traps as an elegant and simple way to store laser-cooled neutral atoms has rapidly increased. Far-off-resonance optical dipole traps can confine atoms in all ground states for a long time with a very small ground state relaxation time. In contrast to previous work, the magneto-optical trap presented here describes experiments performed with a few atoms, with the atom number ranging from 1 to 10. The precise control of a deterministic number of atoms is crucial in many experiments, e.g. in cavity QED and quantum information processing.
作为一种优雅而简单的储存激光冷却中性原子的方法,人们对光学偶极子阱的兴趣迅速增加。远共振光学偶极子阱能以极小的基态弛豫时间将原子长时间限制在所有基态。与以前的工作相反,这里提出的磁光阱描述了用几个原子进行的实验,原子序数从1到10不等。原子数量的精确控制在许多实验中是至关重要的,例如在腔QED和量子信息处理中。
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引用次数: 4
Evaporative cooling of cesium in a surface trap 表面捕集器中铯的蒸发冷却
M. Hammes, D. Rychtarik, V. Druzhinina, R. Grimm
Summary form only given. Optical dipole traps facilitate storage of atoms independent of their magnetic sub-state. Trapping at high densities is thus not limited by two-body collisions changing the spin state of the atom, which in the particular case of cesium have so far prevented the attainment of Bose-Einstein condensation in magnetic traps. For evaporative cooling of Cs we use the gravito-optical surface trap (GOST) which consists of a horizontal evanescent-wave (EW) atom mirror in combination with a blue-detuned hollow beam (HE) for transverse confinement. Starting conditions for evaporative cooling are prepared by optical cooling, based on inelastic reflections from the EW.
只提供摘要形式。光学偶极子阱有助于独立于其磁亚态的原子的存储。因此,高密度的俘获不受改变原子自旋状态的两体碰撞的限制,在铯的特殊情况下,这种碰撞迄今为止阻碍了磁阱中玻色-爱因斯坦凝聚的实现。对于铯的蒸发冷却,我们使用了重力光学表面阱(GOST),它由一个水平倏逝波(EW)原子反射镜和一个蓝色失谐空心光束(HE)组成,用于横向约束。利用电子波的非弹性反射,通过光学冷却制备蒸发冷却的起始条件。
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引用次数: 0
Dynamical behavior of mutually-coupled semiconductor lasers: modelling and simulations 相互耦合半导体激光器的动力学行为:建模和仿真
J. Mulet, T. Heil, C. Mirasso, Ingo Fischer
Summary form only given. The dynamical behavior of two weakly mutually-coupled semiconductor lasers has been recently studied both experimentally and numerically. The main results predict that two different lasers may synchronize. The simplest synchronization mechanism is such that one laser is forced to oscillate at the relaxation oscillation frequency of the other laser. On the other hand, experiments on strongly mutually-coupled semiconductor lasers show the occurrence of synchronized low frequency fluctuations (LFFs) similar to the ones observed in a diode laser subjected to optical feedback. We numerically study the dynamical behavior of two mutually coupled semiconductor lasers under different coupling strengths and detunings. We model the two lasers with the single mode rate equations with extra terms accounting for the delayed light injected by the other laser. For simplicity, we take identical parameters for the two lasers, although for slightly different parameters we observe the same qualitative behaviors. We observe that for strong coupling and zero detuning both lasers exhibit synchronized LFFs.
只提供摘要形式。近年来,对两个弱互耦合半导体激光器的动力学行为进行了实验和数值研究。主要结果预测两个不同的激光器可以同步。最简单的同步机制是迫使一个激光以另一个激光的松弛振荡频率振荡。另一方面,在强互耦合半导体激光器上的实验表明,同步低频波动(LFFs)的发生与在受光反馈的二极管激光器中观察到的相似。本文对两个互耦半导体激光器在不同耦合强度和失谐下的动力学行为进行了数值研究。我们用单模速率方程对两个激光器进行了建模,其中额外的项代表了另一个激光器注入的延迟光。为简单起见,我们对两种激光器采用相同的参数,尽管参数略有不同,我们观察到相同的定性行为。我们观察到,在强耦合和零失谐情况下,两个激光器都表现出同步的LFFs。
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引用次数: 0
3D images of the retina of the living eye generated using transversal OCT images acquired at different depths 利用在不同深度获得的横向OCT图像生成活体眼睛视网膜的三维图像
A. Podoleanu, J. Rogers, D. Jackson
Summary form only given. We present a relatively fast optical coherence tomography (OCT) system equipped with a special software package to render 3D images of the tissue. The OCT system is capable of producing transversal as well as longitudinal images from the retina in vivo. A powerful superluminiscent diode at 860 nm is used, with the system delivering 140 /spl mu/W power to the eye.
只提供摘要形式。我们提出了一个相对快速的光学相干断层扫描(OCT)系统,配备了一个特殊的软件包来渲染组织的3D图像。OCT系统能够产生体内视网膜的横向和纵向图像。采用功率强大的860纳米超发光二极管,系统可为眼睛提供140 /spl mu/W的功率。
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引用次数: 0
Coherent excitation with a train of electron pulses 一串电子脉冲的相干激发
L. D. Noordam, A. Guertler, F. Robincheaux
The Coulomb field of an electron passing an atom generates a transverse electric field corresponding to a half cycle of electromagnetic radiation and a longitudinal field corresponding to a single cycle pulse. These fields induce transitions within the atom. The power spectrum of the radiation of a single-cycle pulse is very broad. The field of the passing electron can induce transitions in the atom to all states for which the energy difference to the initial state, /spl Delta/E, is within the generated power spectrum. As a result, collisional excitation lacks selectivity in the population of the excited states. We investigate how, in such a collisional process, the transfer to an excited state can be enhanced. In our search for a scheme to control the excited state population we are inspired by the success of controlled photoexcitation using narrow-band lasers, having many oscillations of the e.m. radiation field. We investigated if enhanced excitation of a selected state is also possible for electron collisions and thus turn the (inefficient) broadband excitation into controlled excitation to a selected final state. To this end we consider the impact of a train of electron pulses with a repetition frequency /spl nu/. As in the optical case, this will induce a series of N broadband bursts of radiation spectrum. As can be seen in the figure the analogy with photons holds and N electron bursts spaced with time /spl tau//sub r/ will also favour transitions with frequency /spl nu/=1//spl tau//sub t/.
电子通过原子时的库仑场产生的横向电场对应于半个周期的电磁辐射,纵向电场对应于一个单周期脉冲。这些场引起原子内部的跃迁。单周期脉冲辐射的功率谱很宽。经过的电子的场可以诱导原子跃迁到与初始态的能量差/spl Delta/E在生成的功率谱内的所有状态。因此,碰撞激发在激发态的居群中缺乏选择性。我们研究了如何在这样的碰撞过程中增强向激发态的转移。在我们寻找一种控制激发态居群的方案时,我们受到了使用窄带激光器控制光激发的成功启发,该激光器具有许多电磁辐射场的振荡。我们研究了是否在电子碰撞中也可以增强选定状态的激发,从而将(低效的)宽带激发转变为选定最终状态的受控激发。为此,我们考虑了重复频率/spl / nu/的电子脉冲序列的影响。在光学的情况下,这将引起一系列的N宽带辐射频谱爆发。从图中可以看出,光子的类比成立,N个电子爆发以时间/spl tau//sub r/为间隔,也有利于频率/spl nu/=1//spl tau//sub t/的跃迁。
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引用次数: 0
UV laser footprinting and DNA-protein crosslinking 紫外激光足迹与dna -蛋白质交联
D. Angelov, S. Dimitrov, J. Cadet
Summary form only given. Protein-nucleic acid complexes are the main players of the processes involved in the control of gene expression and regulation. Direct and powerful approaches for studying these interactions are footprinting and protein-DNA crosslinking formation. Protein-DNA crosslinking detects the presence of a protein on a given DNA sequence, while footprinting allows to study the mechanism of protein-DNA interactions.
只提供摘要形式。蛋白质-核酸复合物是参与基因表达和调控控制过程的主要参与者。研究这些相互作用的直接而有力的方法是足迹和蛋白质- dna交联形成。蛋白质-DNA交联检测蛋白质在给定DNA序列上的存在,而足迹允许研究蛋白质-DNA相互作用的机制。
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引用次数: 0
Variable coherence in determining the scattering parameters of diffuse media using laser speckle 用激光散斑确定漫射介质散射参数的变相干性
K. Webb, M. Webster, J. D. McKinnny, A. Weiner
Summary form only given. We demonstrate the application of a variable-coherence laser source for determining the scattering parameters of a diffuse medium and the potential for imaging spatially-dependent scatter. A key concept in this work in the ability to synthesize a variable-coherence source by frequency modulating a tunable laser diode (with a center wavelength of 850 nm) at a rate much faster than the integration time of the detector. This allows for a rapid measurement and the adaption of laser coherence to the degree of scatter, which we show is critical in obtaining the necessary sensitivity.
只提供摘要形式。我们演示了可变相干激光源在确定漫射介质散射参数和成像空间依赖散射的潜力方面的应用。这项工作的一个关键概念是,通过频率调制可调谐激光二极管(中心波长为850纳米),以比探测器的积分时间快得多的速度合成可变相干源的能力。这允许快速测量和适应激光相干散射的程度,我们表明,这是获得必要的灵敏度的关键。
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引用次数: 0
Theoretical study of solid state losers 固体减震器的理论研究
V. Zehnlé
Coupled solid state laser systems belong to the wide family of nonlinear coupled oscillators. These systems are known to exhibit a great number of rich and complex dynamical behaviors: chaos, partial synchronization, periodic behavior, spiking. When the coupling strength is high enough, all the oscillators adopt a common and well defined phase relationship (phase locking). This state of "collective" order is very important since phase locked lasers are promising candidates for the delivering of high power coherent output. Starting from Maxwell-Bloch equations, we develop a theoretical model for a set of coupled monomode lasers in a single crystal. We adopt a semi-classical description and obtain a set of equations describing the temporal evolution of laser field amplitude and population inversion.
耦合固体激光系统属于广义的非线性耦合振荡器。已知这些系统表现出大量丰富而复杂的动力学行为:混沌、部分同步、周期行为、尖峰。当耦合强度足够高时,所有振子都采用共同且定义良好的相位关系(锁相)。这种“集体”顺序的状态非常重要,因为锁相激光器是提供高功率相干输出的有希望的候选者。从麦克斯韦-布洛赫方程出发,建立了单晶耦合单模激光器的理论模型。采用半经典描述,得到了一组描述激光场振幅随时间变化的方程和总体反演方程。
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引用次数: 0
期刊
Conference Digest. 2000 International Quantum Electronics Conference (Cat. No.00TH8504)
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