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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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Ultra-robust informational metasurfaces based on spatial coherence structures engineering

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light(Science & Applications) 2024年第7期13卷 1310-1319页

作者： Leixin Liu Wenwei Liu Fei Wang Xiaofeng Peng Duk-Yong Choi Hua Cheng Yangjian Cai Shuqi Chen shandong provincial engineering and technical center of light manipulations Collaborative Innovation Center of Light Manipulation and ApplicationsShandong Provincial Key Laboratory of Optics and Photonic DeviceSchool of Physics and ElectronicsShandong Normal UniversityJinan 250014China. The key laboratory of Weak light Nonlinear photonics Ministry of EducationSchool of PhysicsSchool of Materials Science and EngineeringSmart Sensing Interdisciplinary Science CenterNankai UniversityTianjin 300071China. School of Physical Science and Technology Soochow UniversitySuzhou 215006China. Laser Physics Centre Research School of PhysicsAustralian National UniversityCanberraACT 2601Australia. The Collaborative Innovation center of Extreme optics Shanxi UniversityTaiyuanShanxi 030006China

Optical information transmission is vital in modern optics and photonics due to its concurrent and multi-dimensional nature,leading to tremendous applications such as optical microscopy,holography,and optical *** optical information transmission technologies suffer from bulky optical setup and information loss/crosstalk when meeting scatterers or obstacles in the light ***,we theoretically propose and experimentally realize the simultaneous manipulation of the coherence lengths and coherence structures of the light beams with the disordered *** ultra-robust optical information transmission and self-reconstruction can be realized by the generated partially coherent beam with modulated coherence structure even 93%of light is recklessly obstructed during light transmission,which brings new light to robust optical information transmission with a single *** method provides a generic principle for the generalized coherence manipulation on the photonic platform and displays a variety of functionalities advancing capabilities in optical information transmission such as meta-holography and imaging in disordered and perturbative media.

关键词： optics coherent holography

Mid-infrared SESAM mode-locked Er:CaF_(2)-SrF_(2)bulk laser at 2.73µm

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Chinese optics Letters 2024年第5期22卷 85-88页

作者：刘晶晶唐琳萱冯潇玥宗梦雨仝鲁阳张振赵丽娜刘杰苏良碧 shandong provincial engineering and technical center of light manipulations and shandong provincial key laboratory of optics and photonic Device School of Physics and ElectronicsShandong Normal UniversityJinan 250358China CAS key laboratory of Transparent and Opto-Functional Inorganic Materials Synthetic Single Crystal Research CenterShanghai Institute of CeramicsChinese Academy of SciencesShanghai 201899China State key laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 201899China

To the best of our knowledge,this is the first time that a mid-infrared Er^(3+):CaF_(2)-SrF_(2) laser has achieved continuous-wave mode-locked operation by a semiconductor saturable absorber *** laser emits a maximum output power of 93 mW at 2.73μm with a repetition rate of approximately 69 MHz and demonstrates a high signal-to-noise ratio of around 71 *** addition,a MgF_(2) birefringent plate was utilized to enable wavelength tuning of the Er^(3+):CaF_(2)-SrF_(2) laser,resulting in operation at approximately 2.73μm,2.75μm,2.79μm,and 2.81μ*** results demonstrate that Er^(3+):CaF_(2)-SrF_(2) is a promising alternative for the generation of efficient diode-pumped mode-locked lasers around 2.8μm.

关键词： mid-infrared laser mode-locked laser tunable wavelength

Robust measurement of orbital angular momentum of a partially coherent vortex beam under amplitude and phase perturbations

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Opto-Electronic Science 2024年第1期3卷 1-12页

作者： Zhao Zhang Gaoyuan Li Yonglei Liu Haiyun Wang Bernhard J.Hoenders Chunhao Liang Yangjian Cai Jun Zeng 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 Collaborative Innovation center of light Manipulation and Applications Shandong Normal UniversityJinan 250358China School of Physical Science and Technology Soochow UniversitySuzhou 215006China School of Physical Science and Technology Suzhou University of Science and TechnologySuzhou 215009China Zernike Institute for Advanced Materials University of GroningenNijenborgh 4NL-9747 AG GroningenThe Netherlands 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

The ability to overcome the negative effects,induced by obstacles and turbulent atmosphere,is a core challenge of long-distance information transmission,and it is of great significance in free-space optical *** spatial-coherence structure,that characterizes partially coherent fields,provides a new degree of freedom for carrying ***,due to the influence of the complex transmission environment,the spatial-coherence structure is severely damaged during the propagation path,which undoubtedly limits its ability to transmit ***,we realize the robust far-field orbital angular momentum(OAM)transmission and detection by modulating the spatial-coherence structure of a partially coherent vortex beam with the help of the *** cross-phase enables the OAM information,quantified by the topological charge,hidden in the spatial-coherence structure can be stably transmitted to the far field and can resist the influence of obstructions and turbulence within the communication *** is due to the self-reconstruction property of the spatial-coherence structure embedded with the *** demonstrate experimentally that the topological charge information can be recognized well by measuring the spatial-coherence structure in the far field,exhibiting a set of distinct and separated dark rings even under amplitude and phase *** findings open a door for robust optical signal transmission through the complex environment and may find application in optical communication through a turbulent atmosphere.

关键词： degree of coherence orbital angular momentum cross-phase topological charge information transmission

Modulation of epsilon-near-zero wavelength and enhancement of third-order optical nonlinearity in ITO/Au multilayer films

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Chinese optics Letters 2023年第1期21卷 131-135页

作者：郭斌张中帅霍燕燕王书运宁廷银 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

We report the modulation of epsilon-near-zero(ENZ)wavelength and enhanced third-order nonlinearity in indium tin oxide(ITO)/Au multilayer *** samples consisting of five-layer 40 nm ITO films spaced by four-layer ultrathin Au films of different thickness,i.e.,ITO(40 nm)/[Au(x)/ITO(40 nm)]4,were prepared by magnetron sputtering at room *** ENZ wavelength in the multilayer films is theoretically calculated and experimentally *** nonlinear refractive index and nonlinear absorption coefficient of the samples of x=0,2,3,4 nm were determined using the Z-scan method at a wavelength of 1.064μ*** large nonlinear refractive index n2=1.12×10^(−13) m^(2)=W and nonlinear absorption coefficient β=−1.78×10^(−7) m=W in the sample of x=4 nm are both four times larger than those in the single-layer ITO *** large optical nonlinearity due to the ENZ enhancement and carrier concentration is *** results indicate that the ITO/Au multilayer films are promising for advanced all-optical devices.

关键词： third-order nonlinearity epsilon-near-zero wavelength multilayer

Generation of Lommel beams through highly scattering media

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Chinese optics Letters 2022年第9期20卷 55-60页

作者：涂诗杰雷倩男蔡阳健赵倩 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 School of Physical Science and Technology Soochow UniversitySuzhou 215006China

Lommel beams have been potential candidates for optical communication and optical manipulation,due to their adjustable symmetry of transverse intensity distribution and continuously variable orbital angular ***,the wavefront of the Lommel beam is scrambled when it transmits through highly scattering ***,we explore the construction of Lommel beams through highly scattering media with a transmission matrix-based point spread function engineering ***,various Lommel beams with different parameters were generated through a ZnO scattering layer by use of a digital micromirror *** construction of Lommel beams under high scattering is expected to benefit the optical applications behind highly scattering media.

关键词： Lommel beams scattering wavefront shaping

Powerful supercontinuum vortices generated by femtosecond vortex beams with thin plates

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photonics Research 2022年第4期10卷 802-809页

作者： Litong Xu Dongwei Li Junwei Chang Deming Li Tingting Xi Zuoqiang Hao 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 School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China

We demonstrate numerically and experimentally the generation of powerful supercontinuum vortices from femtosecond vortex beams by using multiple thin fused silica *** supercontinuum vortices are shown to preserve the vortex phase profile of the initial beam for spectral components ranging from 500 nm to 1200 *** transfer of the vortex phase profile results from the inhibition of multiple filamentation and the preservation of the vortex ring with relatively uniform intensity distribution by means of the thin-plate scheme,where the supercontinuum is mainly generated from the self-phase modulation and self-steepening *** scheme works for vortex beams with different topological charges,which provides a simple and effective method to generate supercontinuum vortices with high power.

关键词： vortex continuum scheme

Efficient high harmonic generation in nonlinear photonic moiré superlattice

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Frontiers of physics 2023年第5期18卷 209-216页

作者： Tingyin Ning Yingying Ren Yanyan Huo Yangjian Cai 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 Collaborative Innovation center of light Manipulation and Applications Shandong Normal UniversityJinan 250358China

photonic moirésuperlattice as an emerging platform of flatbands can tightly confine the light inside the cavity and has important applications not only in linear optics but also in nonlinear *** this paper,we numerically investigate the third-and fifth-order harmonic generation(THG and FHG)in photonic moirésuperlattices fabricated by the nonlinear material *** high conversion efficiency of THG and FHG is obtained at a relatively low intensity of fundamental light,e.g.,the maximum conversion efficiency of THG and FHG arrives even up to be 10^(−2) and 10^(−9) at the fundamental intensity of 30 kW/m^(2),respectively,in the moirésuperlattice of near flat band formed by the twist angle 6.01°.The results indicate the photonic moirésuperlattice of a high-quality factor and flatbands is a promising platform for efficient nonlinear processes and advanced photonic devices.

关键词： moirésuperlattice resonant mode harmonic generation