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2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)最新文献

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Attosecond Electron Localization and Screening Dynamics in Metals 金属中的阿秒电子定位与筛选动力学
M. Volkov, Shunsuke A. Sato, F. Schlaepfer, L. Kasmi, N. Hartmann, M. Lucchini, L. Gallmann, Á. Rubio, U. Keller
A high degree of electron localization on the d-orbitals of transition metals and their compounds provides a lever to efficiently control their properties with light. For example, light absorption in VO2 may result in an ultrafast electronic phase transition from a dielectric into a metallic state [1]. The essential timescale of electronic phase transitions is connected to the screening dynamics, which typically belongs to the attosecond domain. It is followed by femtosecond electron-electron thermalization, which may blur the initial imprints of screening-induced charge re-distribution. Here we show that the properties of transition metals could in principle be manipulated much faster than the electron thermalization timescale and even faster than the optical cycle.
过渡金属及其化合物的d轨道上高度的电子局域化为有效地控制它们的光性质提供了一个杠杆。例如,VO2中的光吸收可能导致从介电态到金属态的超快电子相变[1]。电子相变的基本时间尺度与筛选动力学有关,通常属于阿秒域。其次是飞秒电子-电子热化,这可能模糊筛选引起的电荷再分配的初始印记。在这里,我们证明了过渡金属的性质原则上可以比电子热化时间尺度更快地被操纵,甚至比光学周期更快。
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引用次数: 0
Light Transport and Vortex Formation in All Solid Band Gap Fibres 全固体带隙光纤中的光输运和涡旋形成
A. Pryamikov, G. Alagashev, S. Turitsyn
Study of optical vortices (OV) is a growing area of research bringing together advanced theoretical and mathematical concepts and emerging technologies [1]. The necessary condition of OV existence is zero amplitude on a certain line representing the vortex axis. The zero — amplitude line may coincide with the axis of light beam or have more complicated shape [2]. It is known that the most important feature of the optical vortex formation is the rotation of the Poynting vector (energy rotation) around the phase dislocation (the OV core) [1]. It should also be noted that when the zero amplitude line has the shape of a ring the phases of the plane wavefront inside the ring and outside it differ b y π [2]. In this work, we examine the linear OVs that occur in the cladding of all-solid-band-gap fibres (ASBGFs) [3]. In the case of ASBGFs the formation of OVs can have strong impact on localization of the core modes. We demonstrate that the vortex formation in ASBGFs is determined by the location of the zero — amplitude lines in the cladding elements.
光学涡旋的研究是一个不断发展的研究领域,它将先进的理论和数学概念与新兴技术结合在一起。涡轴存在的必要条件是在某一条代表涡轴的直线上振幅为零。零振幅线可能与光束轴线重合,也可能具有更复杂的形状[2]。众所周知,光涡旋形成的最重要特征是坡印亭矢量(能量旋转)围绕相位错(OV核)[1]的旋转。还应注意,当零振幅线具有环形形状时,环内和环外的平面波前的相位相差为y π[2]。在这项工作中,我们研究了发生在全固体带隙光纤(ASBGFs)[3]包层中的线性OVs。在ASBGFs中,OVs的形成会对核心模态的定位产生强烈影响。我们证明了涡的形成是由包层元件中零振幅线的位置决定的。
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引用次数: 0
Tunable Self-Pulsations in a Quantum-Dot External-Cavity Laser Emitting across the Excited State 跨激发态发射量子点外腔激光的可调谐自脉冲
S. White, M. Cataluna
Self-pulsations have previously been observed in single-section quantum-dot (QD) lasers at low MHz frequencies1 and higher GHz frequencies2. In this contribution, we present the first demonstration of SP involving laser emission solely in the excited-state transition. This was achieved with a single-section amplifier at the core of the laser, thus in the absence of a separate saturable absorber section. SPs had a frequency of ∼3.8 GHz, tunable via current variation. The use of an external cavity and the tunability afforded by this setup also allowed spectrally tunable SPs between 1160 and 1196 nm, which enabled further investigation of its dynamics (including bistability).
在低MHz频率和高GHz频率的单段量子点(QD)激光器中已经观察到自脉冲。在这篇论文中,我们首次展示了仅在激发态跃迁中涉及激光发射的SP。这是通过在激光器核心的单段放大器实现的,因此在没有单独的饱和吸收部分的情况下。SPs的频率为~ 3.8 GHz,可通过电流变化进行调谐。使用外腔和这种设置提供的可调性也允许在1160和1196 nm之间进行光谱可调的SPs,这使得进一步研究其动力学(包括双稳性)成为可能。
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引用次数: 0
Low RF-Power Injection-Locking and Beatnote Control of Terahertz Quantum Cascade Laser Frequency Combs 太赫兹量子级联激光频率梳的低射频功率注入锁定和节拍控制
P. Taeschler, A. Forrer, D. Stark, T. Olariu, M. Beck, J. Faist, G. Scalari
Quantum Cascade lasers (QCLs), relying on intersubband transitions in semiconductor quantum well structures, show very short carrier lifetimes of the order of picoseconds [1]. As a consequence, relaxation oscillations remain over-damped up to modulation frequencies of several tens of GHz [2], enabling efficient amplitude modulation of the gain medium in this frequency range. These properties make QCLs ideally suited for RF-injection-locking. We demonstrate that the round-trip frequency of THz QCLs, as observed from the beatnote, can be injection-locked by RF-modulating the bias current. Within a certain locking range we observe mutual phase-locking of approximately 20 longitudinal modes for significantly lower RF-powers than in previous studies [3]. Apart from injection-locking, we demonstrate beatnote control by means of an external cavity.
量子级联激光器(qcl)依赖于半导体量子阱结构中的子带间跃迁,其载流子寿命非常短,约为皮秒[1]。因此,松弛振荡在几十GHz的调制频率下仍保持过阻尼状态[2],从而实现增益介质在该频率范围内的有效调幅。这些特性使得qcl非常适合rf注入锁定。我们证明了太赫兹qcl的往返频率,正如从节拍笔记观察到的那样,可以通过射频调制偏置电流来锁定注入。在一定的锁定范围内,我们观察到大约20个纵向模式的相互锁相,其rf功率明显低于先前的研究[3]。除了注入锁定之外,我们还演示了通过外部腔体控制节拍的方法。
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引用次数: 0
Metasurfaces Can Sense Spatial Coherence of Light 超表面可以感知光的空间相干性
T. Frank, O. Buchnev, T. Cookson, M. Kaczmarek, P. Lagoudakis, V. Fedotov
We report on a discovery that homogeneous metallic non-diffracting metasurfaces of a certain type respond differently to spatially coherent and incoherent light, enabling robust speckle-free discrimination between different degrees of coherence. The effect has no direct analogue in natural optical materials and may find applications in compact metadevices enhancing imaging, vision, detection, communication and metrology.
我们报告了一项发现,某种类型的均匀金属非衍射超表面对空间相干光和非相干光的响应不同,从而实现了不同相干度之间的鲁棒无斑点识别。这种效应在天然光学材料中没有直接的类似物,可以在紧凑的元器件中找到应用,增强成像,视觉,检测,通信和计量。
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引用次数: 0
Kapitza Pendulum Effect with Overclocked Raman Comb Solitons in a Microring Resonator 微环谐振腔中超频拉曼梳状孤子的Kapitza钟摆效应
D. Puzyrev, N. Alexeeva, I. V. Barashenkov, B. Malomed, C. Milián, D. Skryabin
Frequency comb generation in microring resonators with Kerr nonlinearity has been intensely studied in the last decade. These studies have demonstrated a plethora of novel solitonic effects with immediate applications in the precision measurements and optical signal processing [1]. Using nonlinear effects other than Kerr nonlinearity for comb generation is an active research area. In particular, Raman nonlinearity is ubiquitous in nature and its impact on Kerr frequency combs has attracted significant recent attention [1,2].
近十年来,人们对克尔非线性微环谐振器中频率梳的产生进行了深入的研究。这些研究已经证明了大量新的孤子效应在精密测量和光信号处理中的直接应用[1]。利用克尔非线性以外的非线性效应进行梳子生成是一个活跃的研究领域。特别是,拉曼非线性在自然界中无处不在,它对克尔频率梳的影响最近引起了人们的极大关注[1,2]。
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引用次数: 0
Spectral Interleaving with Quantum Cascade Laser Frequency Combs 量子级联激光频率梳的频谱交织
M. Gianella, Akshay Nataraj, B. Tuzson, F. Kapsalidis, S. Schilt, T. Südmeyer, J. Faist, L. Emmenegger
Quantum cascade laser (QCL) based frequency combs are mid-infrared sources capable of producing hundreds of mW of optical power distributed across several hundred comb lines spanning tens of cm−1. In the dual comb (or multi-heterodyne) configuration, two nearly identical frequency combs with slightly different comb spacing are used as an interrogating and local oscillator comb, respectively, to probe the absorption or refractive index of a sample [1]. The multi-heterodyne beat note signal produced by overlapping the two beams on a fast photodetector allows simultaneous access to all optical frequencies of the interrogating comb, enabling fast (sub-μs) acquisition of time-resolved absorption and/or dispersion spectra [2]. The typical length of QCL devices of ca. 5 mm leads to comb spacings of the order of 10 GHz (0.33 cm−1). While suitable for spectroscopy in the condensed phase, gas-phase spectroscopy requires much finer spectral sampling (e.g. <10 MHz for Doppler-broadened transitions of small molecules). This can be achieved by spectral interleaving, i.e. by the continuous or step-wise shifting of the spectrum of the interrogating comb.
基于量子级联激光(QCL)的频率梳是中红外光源,能够产生数百mW的光功率,分布在跨越数十cm−1的数百个梳线上。在双梳(或多外差)配置中,使用两个几乎相同频率的梳,梳间距略有不同,分别作为询问梳和本振梳,用于探测样品的吸收或折射率[1]。通过在快速光电探测器上重叠两束光束产生的多外差拍音信号允许同时访问查询梳的所有光学频率,从而实现快速(亚μs)采集时间分辨吸收和/或色散光谱[2]。QCL器件的典型长度约为5 mm,导致梳间距约为10 GHz (0.33 cm−1)。虽然适合于凝聚相光谱,但气相光谱需要更精细的光谱采样(例如小分子的多普勒展宽跃迁<10 MHz)。这可以通过频谱交错来实现,即通过连续或逐步移动询问梳的频谱。
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引用次数: 0
Nonlinear Optics of Multiferroic Materials 多铁材料的非线性光学
M. Fiebig
Multiferroics, that is, materials with a coexistence of long-range magnetic and electric order have been attracting tremendous interest because of pronounced coupling effects between magnetic and electric properties that may be the basis for novel devices in which a magnetization is controlled by an electric voltage rather than by energy-intensive electric-current-driven magnetic fields. For monitoring as well as controlling the magnetoelectric coupling, it is essential to have simultaneous access to the magnetic and electric phase of a multiferroic. Only then, the spatial relation between the magnetic and electric domain structures and their response to external perturbations like applied magnetic or electric fields can be studied. Nonlinear optics is particularly well suited for this purpose.
多铁性材料,即具有长程磁性和电序共存的材料,已经引起了极大的兴趣,因为磁性和电性能之间存在明显的耦合效应,这可能是新型器件的基础,其中磁化由电压而不是由能量密集的电流驱动的磁场控制。为了监测和控制磁电耦合,必须同时获得多铁体的磁相和电相。只有这样,才能研究磁畴结构和电畴结构之间的空间关系以及它们对外加磁场或电场等外部扰动的响应。非线性光学特别适合于这一目的。
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引用次数: 0
Cold Damping of a Levitated Nanoparticle 悬浮纳米粒子的冷阻尼
F. Tebbenjohanns, M. Frimmer, A. Militaru, V. Jain, L. Novotný
The interaction of light and matter gives rise to optical forces. A particularly impressive example is optical trapping of dielectric particles in strongly focused laser fields using the optical gradient force. This force pulls the particle to the region of largest field intensity. As a result, for small oscillation amplitudes around the trap center, the particle's center-of-mass motion can be regarded as a harmonic oscillator.
光与物质的相互作用产生光力。一个特别令人印象深刻的例子是利用光学梯度力在强聚焦激光场中捕获介电粒子。这个力把粒子拉到磁场强度最大的区域。因此,对于绕阱中心振荡幅度较小的粒子,质心运动可视为谐振子。
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引用次数: 0
Multiscale Dissipative Structures Driven by Modulation and Polarization Instabilities 调制和极化不稳定性驱动的多尺度耗散结构
H. Kbashi, Marina Zajnulina, Amos M. Garcia, S. Sergeyev
The modulation and multimode instabilities (MI and MMI) are mechanisms driving spontaneous spatial and temporal patterns (STP) formation including rogue waves (RWs) in a vast number of nonlinear systems ranging from biology to the laser physics [1–4]. Using Erbium-doped fiber laser (EDFL) mode-locked with carbon nanotubes, here for the first time we demonstrate experimentally the STP formation in the form of Akhmediev breathers (ABs), Peregrine soliton (PS), bi-periodic (second-order) Akhmediev breathers (BPAB), and chaotic solitons (CSs) driven by modulation and a new type of multimode instability — polarization instability called vector resonance multimode instability (VRMMI) [2, 3]. The output power statistics of STPs reveal their connection with the dark and bright rogue waves (DRWs and BRWs).
调制和多模不稳定性(MI和MMI)是驱动自发时空模式(STP)形成的机制,包括从生物学到激光物理的大量非线性系统中的流氓波(RWs)[1-4]。利用碳纳米管锁模的掺铒光纤激光器(EDFL),我们首次通过实验证明了STP的形成形式为Akhmediev呼吸子(ABs)、Peregrine孤子(PS)、双周期(二阶)Akhmediev呼吸子(BPAB)和由调制驱动的混沌孤子(CSs),以及一种新型的多模不稳定性——偏振不稳定性,称为矢量共振多模不稳定性(VRMMI)[2,3]。stp的输出功率统计揭示了它们与暗异常波和亮异常波之间的联系。
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引用次数: 0
期刊
2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)
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