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Coherence phase spectrum analyzer for a randomly fluctuated fractional vortex beam

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

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Rotational Doppler effect of composite vortex beams with tailored OAM spectra

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Photonics Research 2024年第8期12卷 1665-1672页

作者： YUTIAN LIANG RUIJIAN LI JIE zhao XINGYUAN LU TONG LIU ZHENGLIANG LIU YUAN REN chengliang zhao Department of Aerospace Science and Technology Space Engineering University School of Physical Science and Technology Soochow University Department of Basic Course Space Engineering University

There recently has been increasing interest in the research and application of the rotational Doppler effect(RDE),which paves a promising way to detect rotating objects remotely. In order to obtain more information about the rotating object from the rotational Doppler signal, composite vortex beams by coaxial superposition of orbital angular momentum(OAM) modes are often used as the probe beam. However, to the best of our knowledge, the RDE of composite vortex beams with arbitrary OAM spectra has not yet been comprehensively studied. In this paper, the correspondence between the OAM spectrum of a probe beam and the frequency spectrum of a rotational Doppler signal is theoretically analyzed. It is explicitly revealed that the RDE frequency spectrum of scattered light is related to the product of two autocorrelation functions: one from the OAM spectrum of probe beam and the other from the spiral spectrum of rotating object. On the basis of this relation, one can regulate the RDE frequency spectrum on demand via tailoring the OAM spectrum of the probe beam. As a proof of concept we design a special composite vortex beam to eliminate the broadening of the RDE spectrum induced by misalignment. These findings are of practical value in applications such as remote sensing and optical metrology.

关键词： Circular polarization Doppler effect Light beams Optical vortex beams Remote sensing Spatial light modulators

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Coherence entropy during propagation through complex media

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Advanced Photonics 2024年第4期6卷 25-35页

作者： Xingyuan Lu Zhuoyi Wang Qiwen Zhan Yangjian Cai chengliang zhao Soochow University School of Physical Science and Technology Jiangsu Key Laboratory of Frontier Material Physics and Devices University of Shanghai for Science and Technology School of Optical-Electrical and Computer Engineering Shandong Normal University School of Physics and Electronics Shandong Provincial Engineering and Technical Center of Light ManipulationsShandong Provincial Key Laboratory of Optics and Photonic Device East China Normal University Joint Research Center of Light Manipulation Science and Photonic Integrated Chip of East China Normal University and Shandong Normal University

The deformation, flicker, and drift of a light field owing to complex media such as a turbulent atmosphere have limited its practical applications. Thus, research on invariants in randomly fluctuated light fields has garnered considerable attention in recent years. Coherence is a statistical property of light,while its full and quantitative characterization is challenging. Herein, we successfully realize the orthogonal modal decomposition of partially coherent beams and introduce the application of coherence entropy as a global coherence characteristic of such randomly fluctuated light fields. It is demonstrated that coherence entropy remains consistent during propagation in a unitary system by unraveling complex channels. As representative examples, we study the robustness of coherence entropy for partially coherent beams as they propagate through deformed optical systems and turbulent media. Coherence entropy is anticipated to serve as a key metric for evaluating the propagation of partially coherent beams in complex channels. This study paves the way for a broader application scope of a customized low-coherence light field through nonideal optical systems and complex media.

关键词： Global system for mobile communications Atmospheric propagation Modal decomposition Matrices Turbulence Physical coherence Deformation Partial coherence Spherical lenses Optical coherence

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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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Partially coherent vortex beams:Fundamentals and applications

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Science China(Physics,Mechanics & Astronomy) 2021年第2期64卷 32-50页

作者： Miao Dong chengliang zhao YangJian Cai YuanJie Yang School of Physics University of Electronic Science and Technology of ChinaChengdu611731China School of Physical Science and Technology Soochow UniversitySuzhou215006China Shandong Provincial Engineering and Technical Centre of Light Manipulations&Shandong Provincial Key Laboratory of Optics and Photonic Device School of Physics and ElectronicsShandong Normal UniversityJinan250014China

It has been over 30 years since the concept of optical vortices was first proposed by Coullet et *** 1989,and the field of structured beams has grown *** the last two decades,partially coherent vortex beams(PCVBs)have received increasing interest in the fields of optical manipulation,optical communication,optical imaging,etc.,and great progress has been made in the area of the coherence singularities,generation methods,topological charge measurements,and promising applications of *** this review,we firstly outline the basic concepts of *** explicate the relationship between the coherence vortices and optical vortices,and the evolution behavior of optical vortices to coherence vortices is summarized in *** discuss a special form of coherence singularity,ring dislocation,mathematically and *** ring dislocation in the correlation functions under low coherence is dependent on the mode indices,which provide a feasible approach to measure mode indices of ***,we summarize the various methods for measuring the topological charge of PCVBs,highlight the measurement method based on the cross-correlation function,and a physical explanation on the relation between ring dislocation and topological charge is *** that,we review the recent advances on experimental generation of several kinds of ***,we give an overview on the potential applications of PCVBs.

关键词： coherence singularities coherence vortices vortex beams topological charge

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综合物探方法在章丘多层煤矿采空区探测中的应用

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矿业工程研究 2024年第1期39卷 50-56页

作者：苏媛媛赵诚亮许博文山东省第一地质矿产勘查院山东济南250109

为充分发挥综合物探技术在地下采空区的探测优势,探测地下煤矿采空区的分布特征,更好地服务于城市建设及生态环境保护,选择合适的物探方法至关重要.山东章丘煤矿采空区分布复杂,断裂构造发育,且存在多层煤开采的情况,从分析已有煤矿资... 详细信息

为充分发挥综合物探技术在地下采空区的探测优势,探测地下煤矿采空区的分布特征,更好地服务于城市建设及生态环境保护,选择合适的物探方法至关重要.山东章丘煤矿采空区分布复杂,断裂构造发育,且存在多层煤开采的情况,从分析已有煤矿资料入手,总结煤层分布特征及采空区分布形态,选取高密度电阻率法和EH-4电导率成像法这2种方法对该矿采空区进行勘探,发挥浅层探测优势,选取适当参数,提高探测精度,明确精细化解释原则,推断出勘查区3煤、4煤、7煤、9煤和10煤采空区的分布范围及埋藏深度,并推测主要断裂构造的分布位置.针对物探推断解释的成果,后期进行钻探及井下电视,验证这2种方法组合勘探的效果良好,基本实现对深度30~400 m采空区异常的探测.将高密度电阻率法与EH-4电导率成像法同时运用于煤矿采空区勘查,可为同类场地条件下探测地下煤层采空区提供借鉴.

关键词：多层煤矿采空区煤层分布规律 EH-4电导率成像法高密度电阻率法

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Review on partially coherent vortex beams

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Frontiers of Optoelectronics 2019年第3期12卷 229-248页

作者： Jun ZENG Rong LIN Xianlong LIU chengliang zhao Yangjian CAI School of Physical Science and Technology Soochow UniversitySuzhou 215006China 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 250014China College of Physics and Electronic Engineering Heze UniversityHeze 274015China

Ever since vortex beams were proposed, they are known for owning phase singularity and carrying orbital angular momentum (OAM). In the past decades, coherent optics developed rapidly. Vortex beams have been extended from fully coherent light to partially coherent light, from scalar light to vector light, from integral topological charge (TC) to fractional TC. Partially coherent vortex beams have attracted tremendous interest due to their hidden correlation singularity and unique propagation properties (e.g., beam shaping, beam rotation and self-reconstruction). Based on the sufficient condition for devising a genuine correlation function of partially coherent beam, partially coherent vortex beams with nonconventional correlation functions (i.e., non-Gaussian correlated Schell-model functions) were introduced recently. This timely review summarizes basic concepts, theoretical models, generation and propagation of partially coherent vortex beams.

关键词： partially coherent vortex beam phase singularity correlation singularity topological charge (TC) coherence length correlation function

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Facile fabrication of ultrathin freestanding nanoporous Cu and Cu-Ag films with high SERS sensitivity by dealloying Mg-Cu(Ag)-Gd metallic glasses

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Journal of Materials Science & Technology 2021年第11期70卷 205-213页

作者： Yuan-Yun zhao Feng Qian chengliang zhao Chunxiao Xie Jianguo Wang Chuntao Chang Yanjun Li Lai-Chang Zhang Neutron Scattering Technical Engineering Research Center School of Mechanical EngineeringDongguan University of TechnologyDongguan523808China Department of Materials Science and Engineering Norwegian University of Science and TechnologyTrondheim7491Norway Edith Cowan University School of Engineering270 Joondalup DriveJoondalupPerthWA6027Australia School of Materials Science and Engineering Beijing Institute of TechnologyBeijing100081China

Nanoporous metals prepared by dealloying have attracted increasing attention due to their interesting size-dependent physical,chemical,and biological ***,facile fabrication of metallic ultrathin freestanding nanoporous films(UF-NPFs)by dealloying is still ***,we report a novel strategy of facile preparation of flexible Cu,Cu_(3)Ag,and CuAg UF-NPFs by dealloying thick Mg-Cu(Ag)-Gd metallic glass *** dealloying,the local reaction latent heat-induced glass transition of the precursor ribbons leads to the formation of a solid/liquid interface between the initially dealloyed nanoporous layer and the underlying supercooled liquid *** to the bulging effect of in situ generated H2 on the solid/liquid interface,Cu,Cu_(3)Ag,and CuAg UF-NPFs with thicknesses of~200 nm can self-peel off from the outer surface of the dealloying ***,it was found that the surfaceenhanced Raman scattering(SERS)detection limit of Rhodamine 6G(R6G)on the Cu and CuAg UF-NPF substrates are 10^(-6)M and 10^(-11)M,respectively,which are lower than most of the Cu and Cu-Ag substrates prepared by other *** work presents a reliable simple strategy to synthesize a variety of cost effective and flexible metallic UF-NPFs for functional applications.

关键词： Metallic glasses Dealloying Nanoporous metals Ultrathin freestanding films Surface-enhanced Raman scattering(SERS)

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Facile synthesis of metal and alloy nanoparticles by ultrasound-assisted dealloying of metallic glasses

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Journal of Materials Science & Technology 2021年第23期82卷 144-152页

作者： Yuan-Yun zhao Feng Qian Wenfeng Shen chengliang zhao Jianguo Wang Chunxiao Xie Fengling Zhou Chuntao Chang Yanjun Li Neutron Scattering Technical Engineering Research Center School of Mechanical EngineeringDongguan University of TechnologyDongguan523808China Department of Materials Science and Engineering Norwegian University of Science and TechnologyTrondheim7491Norway Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo315201China School of Materials Science and Engineering Beijing Institute of TechnologyBeijing100081China Guangdong-Hong Kong-Macao Joint Laboratory for Neutron Scattering Science and Technology Dongguan University of TechnologyDongguan523808China

Metal and alloy nanoparticles synthesized by chemical reduction have attracted increasing attention due to their superior physical,chemical,and biological ***,most chemical synthesis processes rely on the use of harsh reducing agents and complicated chemical ***,we report a novel reduction-agent-free and surfactant(stabilizer)-free strategy to synthesize Cu,Ag,Au,Cu-Pt,Cu-Au,Cu-Au-Pt-Pd,and Au-Pt-Pd-Cu nanoparticles by ultrasound-assisted dealloying of Mgbased metallic *** formation mechanism of the metal and alloy nanoparticles is revealed by a detailed investigation of sequential intermediate *** demonstrate that the glass-liquid phase transition of the initially dealloying metallic glasses,together with the synergistic effect of dealloying and ultrasound-driven ligament-breakage of small enough nanoporous intermediates,play key roles in preparing the uniformly dispersed metal and alloy *** approach greatly simplifies the up-scaling synthesis of monometallic and bimetallic nanoparticles,and also provides a general strategy for synthesizing unprecedented multimetallic nanoparticles.

关键词： Metallic glasses Dealloying Ultrasound Nanoparticles Multimetallic nanoparticles

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New(Fe0.76Si0.09B0.1P0.05)98.25Nb1Cu0.75 bulk nanocrystalline alloys with good soft magnetic properties

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Progress in Natural Science:Materials International 2015年第3期25卷 263-266页

作者： Zongzhen Li Shaoxiong Zhou chengliang zhao Lin Xue Guangqiang Zhang Rui Xiang China Iron&Steel Research Institute Group Advanced Technology&Materials Co.Ltd. Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Materials Technology&EngineeringChinese Academy of Sciences

A new(Fe0.76Si0.09B0.1P0.05)98.25Nb1Cu0.75 bulk nanocrystalline alloy in a rod shape with a diameter of 2.5 mm was successfully developed by copper mold casting and isothermal annealing. It was found that the introduction of Cu can result in the formation of a large number of α-Fe(Si)clusters(less than 3 nm) embedded in the glassy matrix, which greatly improved the primary crystallization of α-Fe(Si) nanocrystals during subsequent annealing. The obtained superior soft magnetic properties can be ascribed to the formation of optimal nanocomposite structures with a large number of α-Fe(Si) nanocrystals( 17 nm) uniformly distributed in the glassy matrix.

关键词： Metallic glasses Nanostructured materials Rapid-solidification Microstructure TEM

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