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Coherence phase spectrum analyzer for a randomly fluctuated fractional vortex beam

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Photonics Research 2024年第1期12卷 33-39页

作者： ZHUOYI WANG XINGYUAN LU JIANBO GAO XUECHUN ZHAO qiwen zhan YANGJIAN CAI CHENGLIANG ZHAO School of Physical Science and Technology Soochow UniversitySuzhou 215006China School of Optical-Electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghai 200093China Shandong Provincial Engineering and Technical Center of Light Manipulations&Shandong Provincial Key Laboratory of Optics and Photonic Device School of Physics and ElectronicsShandong Normal UniversityJinan 250358China Shandong Joint Research Center of Light Manipulation Science and Photonics Integrated Chip of East China Normal University and Shandong Normal University East China Normal UniversityShanghai 200241China

Fractional vortex beams exhibit a higher degree of modulation dimensions than conventional vortices,thus inheriting superior anti-turbulent transmission properties through the incorporation of additional coherence ***,aliasing the mixed modes induced by coherence degradation makes the quantitative measurement of the topological charge in fractional vortex beams *** this study,a coherence phase spectrum was introduced,and experimental demonstrations to quantitatively determine the fractional topological charge of partially coherent fractional vortex beams were *** leveraging the four-dimensional measurement of a partially coherent light field,the source coherence function was inversely reconstructed,and fractional topological charges were determined with high precision by extracting the phase spectrum of the coherence ***–Gaussian,elliptical Gaussian,and plane-wave-fraction vortex beams with various degrees of coherence were used to demonstrate measurement *** proposed method is applicable to X-rays and electron *** has potential applications in optical encryption,high-capacity optical communication,and quantum entanglement.

关键词： function fractional vortex

Single-shot phase retrieval for randomly fluctuated and obstructed vortex beams

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Science China(Physics,Mechanics & Astronomy) 2024年第4期67卷 72-80页

作者： Hao zhang Jun’an Zhu Xingyuan Lu Zhiquan Hu Jianbo Gao Kun Liu qiwen zhan Yangjian Cai Chengliang Zhao School of Physical Science and Technology Soochow UniversitySuzhou 215006China School of Optical-Electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghai 200093China Shandong Provincial Engineering and Technical Center of Light Manipulations Shandong Provincial Key Laboratory of Optics and Photonic DeviceSchool of Physics and ElectronicsShandong Normal UniversityJinan 250358China Joint Research Center of Light Manipulation Science and Photonic Integrated Chip of East China Normal University and Shandong Normal University East China Normal UniversityShanghai 200241China

Vortex beams with orbital angular momentum play a crucial role in increasing the information capacity in optical *** magnitude of orbital angular momentum determines the ability of information *** practice,a vortex beam can encounter random objects or turbulence during free-space propagation,resulting in information ***,accurately measuring the orbital angular momentum of a randomly fluctuated and obstructed vortex beam is a considerable ***,we propose a single-shot method for the phase retrieval of a randomly fluctuated and obstructed vortex beam by combining the phase-shift theorem and self-reference *** results reveal that the sign and magnitude of the initial orbital angular momentum can be simultaneously determined based on their quantitative relation with the number of coherence singularities on the observation plane,thus addressing the effects of random occlusion and atmospheric *** proposed method considerably improved the accurate decoding of orbital angular momentum information in nonideal freespace optical communications.

关键词： optical vortex phase retrieve orbital angular momentum measurement antiturbulence antidisturbance

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Quantum integrated nonlocal sensing of dynamic object

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Science China(Physics,Mechanics & Astronomy) 2024年第7期67卷 187-187页

作者： Jiachen Liu qiwen zhan School of Optical-Electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghai 200093China

In recent years,the application of quantum technology for imaging and information acquisition of objects has emerged as a prominent and extensively studied topic among researchers[1].Several well-established technical... 详细信息

关键词： ghost Quantum Sever

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基于转角系统的可重构相干纳米激光阵列

科学通报 2024年第10期69卷 1245-1247页

作者：顾亮亮詹其文上海理工大学光电信息与计算机工程学院上海200093 张江实验室上海201204

自1960年7月梅曼发明第一台激光器以来,追求高性能和微型化的激光从未停止,特别是半导体激光,已成为信息技术的核心器件之一[1,2].微型化激光的相关研究始于20世纪90年代,研究人员发现,激光尺寸越小,其自发辐射速率越快且耦合因子越大,... 详细信息

自1960年7月梅曼发明第一台激光器以来,追求高性能和微型化的激光从未停止,特别是半导体激光,已成为信息技术的核心器件之一[1,2].微型化激光的相关研究始于20世纪90年代,研究人员发现,激光尺寸越小,其自发辐射速率越快且耦合因子越大,故调制速率更快且阈值更低[3].因此,追求体积小、速度快、功耗低的微型激光一直是激光领域的研究热点之一.21世纪初,研究人员陆续发明了纳米线激光、微盘激光和光子晶体缺陷态激光,这些微型化激光的特征尺寸约为一个真空波长[4~6];2009年创造的等离激元纳米激光则又将其特征尺寸下降了一个数量级,仅为真空波长的1/10[7].

关键词：激光领域调制速率特征尺寸半导体激光等离激元梅曼激光阵列耦合因子

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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44卷 294-300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上海200093 釜山国立大学物理系韩国釜山46241

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... 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

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强聚焦高阶时空涡旋的生成方法及其传播特性

光学学报 2024年第10期44卷 338-346页

作者：于自强莫德威于飞詹其文陈建上海理工大学光电信息与计算机工程学院上海200093 上海理工大学上海市现代光学系统重点实验室上海200093 中国科学院上海光学精密机械研究所高功率激光单元技术实验室上海201800 国科大杭州高等研究院物理与光电工程学院浙江杭州310024

主要研究了经高数值孔径物镜强聚焦生成高阶时空涡旋的方法及高度局域时空涡旋在焦平面前后的传播特性。根据模式转换理论,对入射波包进行预处理,利用Richards Wolf矢量衍射公式仿真计算预处理后的入射波包以及经透镜强聚焦后在焦平面... 详细信息

主要研究了经高数值孔径物镜强聚焦生成高阶时空涡旋的方法及高度局域时空涡旋在焦平面前后的传播特性。根据模式转换理论,对入射波包进行预处理,利用Richards Wolf矢量衍射公式仿真计算预处理后的入射波包以及经透镜强聚焦后在焦平面及焦平面前后传播的时空波包的三维时空分布,并对其强度和相位进行了分析。结果表明,强聚焦波包具有预定的高阶时空螺旋相位,且在透镜焦平面前后传播过程中,时空波包的总拓扑荷数保持不变,波包强度分布发生旋转,波包内部演化出若干个一阶时空相位奇点。

关键词：物理光学轨道角动量时空光涡旋强聚焦光束传播拓扑荷数

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

Physical conversion and superposition of optical skyrmion topologies

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Photonics Research 2023年第12期11卷 2042-2053页

作者： HOUAN TENG JINzhan ZHONG JIAN CHEN XINRUI LEI qiwen zhan School of Optical-Electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghai 200093China zhangjiang Laboratory Shanghai 201204China

Optical skyrmions are quasiparticles with nontrivial topological textures that have significant potential in optical information processing,transmission,and ***,we theoretically and experimentally achieve the conversion of optical skyrmions among Néel,Bloch,intermediate skyrmions,and bimerons by polarization devices,where the fusion and annihilation of optical skyrmions are demonstrated *** analyzing the polarization pattern in Poincarébeams,we reveal the skyrmion topology dependence on the device,which provides a pathway for the study of skyrmion interactions.A vectorial optical field generator is implemented to realize the conversion and superposition experimentally,and the results are in good agreement with the theoretical *** results enhance our comprehension of optical topological quasiparticles,which could have a significant impact on the transfer,storage,and communication of optical information.

关键词： Poincaré superposition topological

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