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携带横向轨道角动量的时空局域波包的传输特性（特邀）

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光学学报 2024年第10期 302-308页

作者：张年佳曹前 chong andy 詹其文上海理工大学光电信息与计算机工程学院釜山国立大学物理系

光学轨道角动量（OAM）可以纵向OAM的形式存在于空间涡旋光束中，或以横向OAM的形式存在于时空光涡旋波包中。与涡旋光束不同，时空光涡旋波包在传播过程中同时受到衍射和色散效应的影响，造成波包在时空域内的展宽，并且时空光涡旋波... 详细信息

光学轨道角动量（OAM）可以纵向OAM的形式存在于空间涡旋光束中，或以横向OAM的形式存在于时空光涡旋波包中。与涡旋光束不同，时空光涡旋波包在传播过程中同时受到衍射和色散效应的影响，造成波包在时空域内的展宽，并且时空光涡旋波包携带的横向OAM也会在传播过程中分裂。这两点限制了横向OAM在其他研究领域的应用。本文引入并研究了携带横向OAM的三维时空局域波包，此波包可以同时克服衍射与色散效应造成的时空域三维变化。在传播过程中，该时空局域波包的时空域分布不变，且在遇到障碍物后也能快速重新恢复到原有的状态，具有传播不变以及自恢复的特性。本文对时空局域波包的传播过程以及经过障碍物后的恢复过程进行了数值模拟仿真，证实了其传播不变特性和自恢复特性。这种携带横向OAM的三维时空局域波包为横向OAM未来的利用提供了新的机遇，有望应用于光通信、量子光学、光学成像等领域。

关键词：横向光学轨道角动量三维时空局域波包传播不变自恢复

Photonic orbital angular momentum with controllable orientation

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National Science Review 2022年第7期9卷 56-62页

作者： Chenhao Wan Jian Chen andy chong Qiwen Zhan School of Optical-Electrical and Computer Engineering University of Shanghai for Science and Technology Department of Physics University of Dayton School of Optical and Electronic Information Huazhong University of Science and Technology Department of Electro-Optics and Photonics University of Dayton

Vortices are whirling disturbances,commonly found in nature,ranging from tremendously small scales in Bose-Einstein condensations to cosmologically colossal scales in spiral *** optical vortex,generally associated with a spiral phase,can carry orbital angular momentum(OAM).The optical OAM can either be in the longitudinal direction if the spiral phase twists in the spatial domain or in the transverse direction if the phase rotates in the spatiotemporal *** this article,we demonstrate the intersection of spatiotemporal vortices and spatial vortices in a wave *** a result of this intersection,the wave packet hosts a tilted OAM that provides an additional degree of freedom to the applications that harness the OAM of photons.

关键词： orbital angular momentum spatiotemporal vortex spatial vortex spiral phase

Optical spatiotemporal vortices

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eLight 2023年第1期3卷 156-168页

作者： Chenhao Wan andy chong Qiwen Zhan School of Optical-Electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghai 200093China School of Optical and Electronic Information and Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074HubeiChina Department of Physics Pusan National UniversityGeumjeong-GuBusan 46241South Korea Zhangjiang Laboratory 100 Haike RoadShanghai 201204China Shanghai Key Lab of Modern Optical System University of Shanghai for Science and TechnologyShanghai 200093China

Spatiotemporal vortices of light,featuring transverse orbital angular momentum(OAM)and energy circulation in the spatiotemporal domain,have received increasing attention *** experimental realization of the controllable generation of spatiotemporal vortices triggers a series of research in this *** review article covers the latest developments of spatiotemporal vortices of light ranging from theoretical physics,experimental generation schemes,and characterization methods,to applications and future *** new degree of freedom in photonic OAM endowed by spatiotemporal vortices paves the way to the discovery of novel physical mechanisms and photonic applications in light science.

关键词： Spatiotemporal optical vortex Orbital angular momentum Spin-orbit interaction Linear momentum density Toroidal vortex Topological charge

Tilted spatiotemporal optical vortex with partial temporal coherence [Invited]

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Chinese Optics Letters 2023年第12期21卷 7-10页

作者： Jordan Adams andy chong Department of Electro-Optics and Photonics University of DaytonDaytonOhio 45434United States Optics and Photonics Riverside Research InstituteBeavercreekOhio 45431United States Department of Physics Pusan National UniversityGeumjeong-GuBusan 46241Republic of Korea

We report the experimental and theoretical investigation of tilted spatiotemporal optical vortices with partial temporal *** theoretical study shows that the instantaneous spatiotemporal optical vortex is widely variable with the statistical orbital angular momentum(OAM)*** decreasing temporal coherence results in a larger variability of OAM tilt,the average OAM direction is relatively unchanged.

关键词： STOVs tilted optical vortex partial temporal coherence optical OAM partially coherent OAM

Scalar optical hopfions

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eLight 2022年第1期2卷 284-290页

作者： Chenhao Wan Yijie Shen andy chong Qiwen Zhan School of Optical‑Electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghai 200093China School of Optical and Electronic Information and Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074HubeiChina Optoelectronics Research Centre University of SouthamptonSouthampton SO171BJUK Department of Physics Pusan National UniversityGeumjeong‑GuBusan 46241South Korea Zhangjiang Laboratory 100 Haike RoadShanghai 201204China Shanghai Key Lab of Modern Optical System University of Shanghai for Science and TechnologyShanghai 200093China

Hopfions are three-dimensional(3D)topological states discovered in field theory,magnetics,and hydrodynamics that resemble particle-like objects in physical *** inherit the topological features of the Hopf fibration,a homotopic mapping from unit sphere in 4D space to unit sphere in 3D *** we design and demonstrate dynamic scalar optical hopfions in the shape of a toroidal vortex and expressed as an approximate solution to Maxwell’s *** lines correspond to disjoint and interlinked loops forming complete ring tori in 3D *** Hopf invariant,product of two winding numbers,is determined by the topological charge of the poloidal spatiotemporal vortices and toroidal spatial vortices in toroidal *** hopfions provide a photonic testbed for studying topological states and may be utilized as high-dimensional information carriers.

关键词： Hopfion Toroidal vortex Spatiotemporal vortex Wave packet Topology Topological charge

Complex Swift Hohenberg equation dissipative soliton fiber laser

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Photonics Research 2021年第6期9卷 1033-1038页

作者： ANKITA KHANOLKAR YIMIN ZANG andy chong Department of Electro-Optics and Photonics University of DaytonDaytonOhio 45469USA Department of Physics University of DaytonDaytonOhio 45469USA

Complex Swift Hohenberg equation(CSHE)has attracted intensive research interest over the years,as it enables realistic modeling of mode-locked lasers with saturable absorbers by adding a fourth-order term to the spectral *** researchers have reported a variety of numerical solutions of CSHE which reveal interesting pulse patterns and *** this work,we have demonstrated a CSHE dissipative soliton fiber laser experimentally using a unique spectral filter with a complicated transmission *** behavior and performance of the laser agree qualitatively with the numerical simulations based on *** findings bring insight into dissipative soliton dynamics and make our mode-locked laser a powerful testbed for observing dissipative solitons of CSHE,which may open a new course in ultrafast fiber laser research.

关键词： fiber laser soliton

Propagation of transverse photonic orbital angular momentum through few-mode fiber

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Advanced Photonics 2023年第3期5卷 101-107页

作者： Qian Cao Zhuo Chen chong Zhang andy chong Qiwen Zhan University of Shanghai for Science and Technology School of Optical-Electrical and Computer EngineeringShanghaiChina Zhangjiang Laboratory ShanghaiChina University of Shanghai for Science and Technology Shanghai Key Laboratory of Modern Optical SystemShanghaiChina Pusan National University Department of PhysicsBusanRepublic of Korea

Spatiotemporal optical vortex(STOV)pulses can carry transverse orbital angular momentum(OAM)that is perpendicular to the direction of pulse *** a STOV pulse,its spatiotemporal profile can be significantly distorted due to unbalanced dispersive and diffractive *** may limit its use in many research applications,where a long interaction length and a tight confinement of the pulse are *** first demonstration of STOV pulse propagation through a few-mode optical fiber is *** numerical and experimental analysis on the propagation of STOV pulse through a commercially available SMF-28 standard telecommunication fiber is *** spatiotemporal phase feature of the pulse can be well kept after the pulse propagates a few-meter length through the fiber even with *** propagation of the pulse will result in a breakup of its spatiotemporal spiral phase structure due to an excessive amount of modal group delay *** stable and robust transmission of transverse photonic OAM through optical fiber may open new opportunities for transverse photonic OAM studies in telecommunications,OAM lasers,and nonlinear fiber-optical research.

关键词： photonic orbital angular momentum spatiotemporal optical vortices multimode fiber

Generation of ultrafast spatiotemporal wave packet embedded with time-varying orbital angular momentum

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Science Bulletin 2020年第16期65卷 1334-1336,M0003页

作者： Chenhao Wan Jian Chen andy chong Qiwen Zhan School of Optical-Electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghai 200093China School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China Department of Physics University of DaytonDaytonOH 45469USA Department of Electro-Optics and Photonics University of DaytonDaytonOH 45469USA

It was not until 1992 did scientists realize that light beams with a helical phase carry orbital angular momentum(OAM)[1].The discovery of optical OAM has spurred a wealth of applications such as high-speed optical communications,optical spanners and spinorbit angular momentum coupling[2-4].To date,the majority of OAM beams are temporally static,i.e.,the OAM does not vary in ***,Rego et al.[5]generated extreme-ultraviolet selftorqued beams in high-harmonic generation driven by timedelayed pulses that differ by one unit of *** temporal OAM variation could potentially be utilized to manipulate nanostructures and launch chiral excitations on ultrafast time scales[6].

关键词：轨道角动量普朗克常数拓扑荷波包涡旋光束微纳米结构时间间隔相位旋转

Ultrabroadband,few-cycle pulses directly from a Mamyshev fiber oscillator

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Photonics Research 2020年第1期8卷 65-69页

作者： CHUNYANG MA ANKITA KHANOLKAR YIMIN ZANG andy chong Department of Electronic Science and Engineering Jilin UniversityChangchun 130012China Department of Physics University of DaytonDaytonOhio 45469USA Department of Electro-Optics and Photonics University of DaytonDaytonOhio 45469USA

While the performance of mode-locked fiber lasers has been improved significantly,the limited gain bandwidth restricts them from generating ultrashort pulses approaching a few cycles or even *** we present a novel method to achieve few-cycle pulses(~5 cycles)with an ultrabroad spectrum(~400 nm at-20 dB)from a Mamyshev oscillator configuration by inserting a highly nonlinear photonic crystal fiber and a dispersion delay line into the cavity.A dramatic intracavity spectral broadening can be stabilized by the unique nonlinear processes of a self-similar evolution as a nonlinear attractor in the gain fiber and a"perfect"saturable absorber action of the Mamyshev *** the best of our knowledge,this is the shortest pulse width and broadest spectrum directly generated from a fiber laser.

关键词： fiber oscillator cycle