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2003 Conference on Lasers and Electro-Optics Europe (CLEO/Europe 2003) (IEEE Cat. No.03TH8666)最新文献

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Violet laser diodes for laser cooling and trapping of ytterbium atoms 用于激光冷却和捕获镱原子的紫色激光二极管
C. Park, Jae Ihn Kim, Jin Yong Yeom, T. Yoon
We report the construction of frequency-stabilized high-power violet laser diodes for laser cooling and trapping experiment of ytterbium atoms. An external-cavity master laser of which frequency was stabilized to the ytterbium cooling transition at 398.9 nm was built and used to build a frequency-stabilized high-power slave laser (25 mW) by injection seeding technique.
本文报道了用于镱原子激光冷却和俘获实验的高功率稳频紫色激光二极管的构建。建立了频率稳定在镱冷却跃迁398.9 nm的外腔主激光器,并利用注入播种技术构建了频率稳定的大功率从激光器(25 mW)。
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引用次数: 0
Optical waveguides in LiF by ion-beam irradiation: fabrication and characterisation 离子束辐照LiF中的光波导:制造和表征
S. Pelli, G. Righini, F. Quercioli, B. Tiribilli, M. Vassalli, M. Cremona, J. Pereira
In our experiments, we have successfully managed to produce optical waveguides in polished LiF crystals by using He/sup +/ ion beam irradiation. The beam was masked by a metal window, producing large irradiated stripes about 1 mm wide. Irradiation energy was chosen to be 1.1 MeV, since it allowed to produce 3 /spl mu/m thick waveguides with a parabolic colour centre creation and thus refractive index profile, which was very suitable for characterisation purposes.
在我们的实验中,我们已经成功地利用He/sup +/离子束辐照在抛光的LiF晶体中产生光波导。光束被金属窗掩盖,产生约1毫米宽的大辐照条纹。辐照能量选择为1.1 MeV,因为它可以产生3 /spl μ m /m厚的波导,具有抛物线色中心,因此折射率分布,非常适合用于表征目的。
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引用次数: 0
Study of poled lithium niobate waveguide devices by confocal defect spectroscopy 用共聚焦缺陷光谱研究极化铌酸锂波导器件
V. Dierolf, C. Sandmann
V, Dierolfnrid Chr. Snridnranri Leliigh Universifq., Physics Depnminit and Center for Opticnl Technologies, Bethlehem, PA 18015 USA Nonlinear light sources based on periodically poled LiNbO, (PPLN) have gained a great deal of attention due to low thresholds, ease of operation and wide tuning range. In particular, the integrated optical versions of them, achieve, due to the confinement of light over long interaction lengths, very high conversion efficiencies. In order to optimize these integrated optical devices, both the Ti-profile and the domain structure have to he engineered precisely and effects of interaction have to be under control. To achieve this goal, we developed a novel characterization tool based on the luminescence of well characterized "designer defect"(e.g.: E?' ) that we use as probes for the local environment. We applied this concept to the two components of a PPLN waveguide device. ( I ) Characrerizaation ofdomain strirctiires nnd domain walls. It has been shown that the domain inversion process, most notably the coercive field, is strongly influenced by the presence of intrinsic and extrinsic defects. We investigated this effect by addressing the reverse question: How does domain inversion influence the intrinsic defects and dopants? Performing optical spectroscopy with high resolution (both spectrally and spatially) on trivalent rare earth ions (E?' and Yb'7 in congruent and stoichiometric LiNbO, we find drastic changes in the defect luminescence. Based on a detailed analysis of these changes, using earlier extensive studies of the defect system [ I ] ; we conclude that a defect reconfiguration takes place. Obviously, some o f the required charge compensators do not reposition themselves according to the reversed orientation of the spontaneous polarization vector at room temperature, while others do. Furthermore, we were able to detect a change in the intrinsic electric field experienced by the ion. On the other hand, we use the emission changes for non-destructive 3D-domain imaging (Fig. I ) in a home-built confocal fluorescence microscope. For this technique, we scan the excitation laser over the sample and measure the corresponding emission spectra. Evaluation of the moments of the spectra enables us to image domains with high contrast and high spatial resolution (<500nm). This method can be employed in situ, allowing precise control of the domain structures and time resolved investigations of domain inversion. For instance, we are studying the spatial extent and dynamics of domain walls. Especially, we focus-on the question at which stage the defect rearrangement occurs. "E. '' uOnrnlnS rrnngea ' y cOn~Oc*' fluorescence microscope.
Dierolfnrid Chr。利利大学。基于周期性极化LiNbO (PPLN)的非线性光源因其低阈值、易于操作和宽调谐范围而受到广泛关注。特别是,它们的集成光学版本,由于光在长相互作用长度上的限制,实现了非常高的转换效率。为了优化这些集成光学器件,必须精确地设计ti轮廓和畴结构,并控制相互作用的影响。为了实现这一目标,我们开发了一种新的表征工具,该工具基于表征良好的“设计缺陷”的发光。: E ?’),作为对当地环境的探测。我们将这一概念应用于PPLN波导器件的两个组件。(1)域约束和域壁的表征。结果表明,畴反转过程,尤其是矫顽场,受到内源缺陷和外源缺陷存在的强烈影响。我们通过解决相反的问题来研究这种效应:畴反转如何影响本征缺陷和掺杂?对三价稀土离子(E?和Yb'7在相同的和化学计量的LiNbO中,我们发现缺陷发光发生了剧烈的变化。基于对这些变化的详细分析,使用早期对缺陷系统的广泛研究[I];我们得出结论,缺陷重构发生了。显然,在所需要的电荷补偿器中,有些在室温下不会根据自发极化矢量的反向方向重新定位,而另一些则会。此外,我们能够探测到离子所经历的本征电场的变化。另一方面,我们在自制的共聚焦荧光显微镜中使用发射变化进行非破坏性3d域成像(图1)。在该技术中,我们对样品进行激发激光扫描,并测量相应的发射光谱。对光谱矩的评估使我们能够获得高对比度和高空间分辨率(<500nm)的图像域。该方法可以在原位应用,允许精确控制畴结构和时间分辨的畴反演研究。例如,我们正在研究畴壁的空间范围和动态。我们特别关注缺陷重排发生在哪个阶段的问题。“E。uOnrnlnS rnngea ' y cOn~Oc*'荧光显微镜。
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引用次数: 0
Fluorescent performance of Cr/sup 4+/:LiGaSiO/sub 4/ - new promising laser crystal Cr/sup 4+/:LiGaSiO/sub 4/ -新型激光晶体的荧光性能
K.A. Soubbotin, V. Smirnov, V. Lebedev, E. Zharikov, I. Shcherbakov, Z.B. Gevorkian
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引用次数: 1
Method for remote sensing of the atmosphere by using laser generated flashes 利用激光产生的闪光对大气进行遥感的方法
A. Martirosyan
In this paper, a new atmospheric monitoring method by using pulsed flashes is described. The formula for calculating the volumes of local regions in the case when scattering angles are not equal to 90/spl deg/ and for the extinction coefficient K between flashes is introduced.
本文介绍了一种利用脉冲闪光进行大气监测的新方法。给出了散射角不等于90/spl°时局部区域体积和闪光间消光系数K的计算公式。
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引用次数: 0
Effects of optical nonlinearity in picosecond optical pulse transmission over 200 km of optical fibers using a midspan optical phase conjugation 采用跨中相位共轭的光纤传输皮秒光脉冲时光学非线性的影响
J. Inoue, H. Sotobayashi, F. Kubota, H. Kawaguchi
In this report, we experimentally demonstrate that mid-span optical phase conjugation(OPC) transmissions have large tolerance for the nonlinearity. We also compare the results with that in the transmission experiments using 200 km large-core SMFs and NDFs. We used a semiconductor optical amplifier (SOA) as an optical phase conjugator and 200 km of standard SMFs as a transmission line. We found that mid-span OPC has large tolerance for optical nonlinearity in the transmission line.
在本报告中,我们通过实验证明了中跨光相位共轭(OPC)传输具有很大的非线性容忍度。并与200 km大芯smf和ndf的传输实验结果进行了比较。我们使用半导体光放大器(SOA)作为光相位共轭器,并使用200公里的标准smf作为传输线。我们发现中跨OPC对传输线中的光学非线性有很大的容忍度。
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引用次数: 0
Fine frequency tuning of a microspherical cavity by temperature control 通过温度控制实现微球腔的精细频率调谐
A. Chiba, H. Fujiwara, J. Hotta, S. Takeuchi, K. Sasaki
In this paper, resonant frequency control for the whispering-gallery modes (WGM) is demonstrated by adjusting the temperature. We used single-mode optical fiber for the fabrication of the microsphere. The polymer coating of the fiber was stripped, and then the tip was melted by a focused CO/sub 2/ laser beam to form a sphere with a stem. The temperature of the microsphere was monitored by a thermometer. A tunable external-cavity diode laser (linewidth<300 kHz) was illuminated on the microsphere. The scattered light from the microsphere was collected by a microscope objective and imaged onto a pinhole so that the edge of the microsphere was selectively observed by an avalanche photodiode. We scanned the laser frequency to measure the scattering spectra over tens of GHz range at 780 nm.
本文演示了通过调节温度来控制耳语通道模式(WGM)的谐振频率。我们使用单模光纤来制造微球。将光纤的聚合物涂层剥离,然后用聚焦的CO/sub /激光束将尖端熔化,形成一个带茎的球体。用温度计监测微球的温度。将线宽< 300khz的可调谐外腔二极管激光器照射在微球上。来自微球的散射光被显微镜物镜收集并成像到针孔上,以便雪崩光电二极管选择性地观察微球的边缘。我们对激光频率进行扫描,在780 nm处测量了几十GHz范围内的散射光谱。
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引用次数: 0
The dynamics of few femtosecond pulse in a Kerr-lens mode-locked laser from full space-time domain simulations 克尔透镜锁模激光器中几个飞秒脉冲的动力学研究
A.I. Konukhov, L. Melnikov
The Kerr-lens mode locking lasers is known suitable for generation of few femtoseconds pulses. In this paper, we have developed full spatio-temporal numerical model of Kerr-lens mode-locked laser based on the wave equation for field envelope taking into account the space-temporal coupling. We present a detailed analysis of different regimes of oscillations of Ti:Sapphire laser. The stability region, quasilocking regimes caused by transverse mode beating, different kind of pulse train instabilities are demonstrated. The dispersion, cavity arm lengths, round-trip gain necessary for stable producing of shortest pulses are presented.
克尔透镜锁模激光器已知适合于产生几飞秒脉冲。本文在考虑时空耦合的场包络波方程的基础上,建立了克尔透镜锁模激光器的全时空数值模型。我们详细分析了钛蓝宝石激光器的不同振荡机制。论证了系统的稳定区域、横模跳动引起的准锁态、不同类型的脉冲序列不稳定性。给出了稳定产生最短脉冲所需的色散、腔臂长度和往返增益。
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引用次数: 0
Enhanced self-mode-locking in broad area semiconductor lasers by pulse injection 脉冲注入增强广域半导体激光器的自锁模
J. Kaiser, Ingo Fischer, W. Elsaber
In this paper we give evidence that in free-running broad area semiconductor lasers (BALs) weak self-mode-locking of longitudinal modes already exists, leading to a fast regular intensity modulation of the output at the cavity round trip time. This fast dynamics deteriorates the output in terms of spectral width and temporal stability on the one hand, but on the other hand it could also offer an interesting possibility for optical pulse generation in these semiconductor laser devices. In fact, a significant improvement of the pulsed output has been achieved by additional injection of a picosecond pulse into the device.
本文证明了在自由运行的广域半导体激光器(BALs)中,纵向模式的弱自锁模已经存在,从而导致了在空腔往返时间输出的快速规则强度调制。这种快速动态一方面会使输出在光谱宽度和时间稳定性方面恶化,但另一方面,它也可以为这些半导体激光设备中的光脉冲产生提供有趣的可能性。事实上,通过向器件中额外注入皮秒脉冲,已经实现了脉冲输出的显著改进。
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引用次数: 0
Sub-500 fs operation of a passively mode-locked surface-emitting laser at a repetition rate of more than 10 GHz 被动锁模表面发射激光器在超过10ghz的重复频率下低于500fs的工作
S. Hoogland, A. Tropper
We report on a passively mode-locked diode-pumped surface-emitting laser operating at a fundamental repetition rate of 10.014 GHz with a pulse duration of 490 fs. The average output power was 37.8 mW.
本文报道了一种被动锁模二极管泵浦表面发射激光器,工作频率为10.014 GHz,脉冲持续时间为490 fs。平均输出功率为37.8 mW。
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引用次数: 0
期刊
2003 Conference on Lasers and Electro-Optics Europe (CLEO/Europe 2003) (IEEE Cat. No.03TH8666)
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