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Single-shot real-time femtosecond imaging of temporal focusing

Light(Science & Applications) 2018年第1期7卷 593-602页

作者： jinyang liang Liren Zhu Lihong V.Wang Caltech Optical Imaging Laboratory Andrew and Peggy Cherng Department of Medical EngineeringDepartment of Electrical EngineeringCalifornia Institute of Technology1200 East California BoulevardMail Code 138-78PasadenaCA 91125USA Present address:CentreÉnergie Matériaux Télécommunications Institut National de la Recherche Scientifique1650 Boulevard Lionel-BouletVarennesQC J3X1S2Canada

While the concept of focusing usually applies to the spatial domain,it is equally applicable to the time *** imaging of temporal focusing of single ultrashort laser pulses is of great significance in exploring the physics of the space–time duality and finding diverse *** drastic changes in the width and intensity of an ultrashort laser pulse during temporal focusing impose a requirement for femtosecond-level exposure to capture the instantaneous light patterns generated in this exquisite *** far,established ultrafast imaging techniques either struggle to reach the desired exposure time or require repeatable *** have developed single-shot 10-trillion-frame-per-second compressed ultrafast photography(T-CUP),which passively captures dynamic events with 100-fs frame intervals in a single camera *** synergy between compressed sensing and the Radon transformation empowers T-CUP to significantly reduce the number of projections needed for reconstructing a high-quality three-dimensional spatiotemporal *** the only currently available real-time,passive imaging modality with a femtosecond exposure time,T-CUP was used to record the first-ever movie of nonrepeatable temporal focusing of a single ultrashort laser pulse in a dynamic scattering medium.T-CUP’s unprecedented ability to clearly reveal the complex evolution in the shape,intensity,and width of a temporally focused pulse in a single measurement paves the way for single-shot characterization of ultrashort pulses,experimental investigation of nonlinear light-matter interactions,and real-time wavefront engineering for deep-tissue light focusing.

关键词： ultrashort passive scattering

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Single-shot compressed optical field topography

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Light(Science & Applications) 2022年第9期11卷 2166-2175页

作者： HAOCHENG TANG TING MEN XIANGLEI LIU YAODAN HU JINGQIN SU YANLEI ZUO PING LI jinyang liang MICHAEL C.DOWNER ZHENGYAN LI School of Optical and Electronic Information&Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhanHubeiChina Centre Energie Matériaux Télécommunications Institut National de la Recherche ScientifiqueUniversitédu QuébecVarennesQuébecCanada Laser Fusion Research Center Chinese Academy of Engineering PhysicsMianyangSichuanChina Department of Physics University of Texas at AustinAustinTXUSA Optics Valley Laboratory WuhanHubeiChina

Femtosecond lasers are powerful in studying matter's ultrafast dynamics within femtosecond to attosecond time *** a three-dimensional(3D)topological map of the optical field of a femtosecond laser pulse including its spatiotemporal amplitude and phase distributions,allows one to predict and understand the underlying physics of light interaction with matter,whose spatially resolved transient dielectric function experiences ultrafast ***,such a task is technically challenging for two reasons:first,one has to capture in single-shot and squeeze the 3D information of an optical field profile into a two-dimensional(2D)detector;second,typical detectors are only sensitive to intensity or amplitude information rather than *** we have demonstrated compressed optical field topography(COFT)drawing a 3D map for an ultrafast optical field in single-shot,by combining the coded aperture snapshot spectral imaging(CASSI)technique with a global 3D phase retrieval *** can,in single-shot,fully characterize the spatiotemporal coupling of a femtosecond laser pulse,and live stream the light-speed propagation of an air plasma ionization front,unveiling its potential applications in ultrafast sciences.

关键词： optical topography field

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High-speed dual-view band-limited illumination profilometry using temporally interlaced acquisition

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Photonics Research 2020年第11期8卷 1808-1817页

作者： Cheng Jiang Patrick Kilcullen Yingming Lai Tsuneyuki Ozaki jinyang liang CentreÉnergie Matériaux Télécommunications Institut National de la Recherche Scientifique1650 boulevard Lionel-BouletVarennesQuébec J3X1S2Canada

We report dual-view band-limited illumination profilometry(BLIP)with temporally interlaced acquisition(TIA)for high-speed,three-dimensional(3D)***-limited illumination based on a digital micromirror device enables sinusoidal fringe projection at up to 4.8 *** fringe patterns are captured alternately by two high-speed cameras.A new algorithm,which robustly matches pixels in acquired images,recovers the object’s 3D *** resultant TIA–BLIP system enables 3D imaging over 1000 frames per second on a field of view(FOV)of up to 180 mm×130 mm(corresponding to 1180×860 pixels)in captured *** demonstrated TIA–BLIP’s performance by imaging various static and fast-moving 3D ***–BLIP was applied to imaging glass vibration induced by sound and glass breakage by a *** to existing methods in multiview phase-shifting fringe projection profilometry,TIA–BLIP eliminates information redundancy in data acquisition,which improves the 3D imaging speed and the *** envision TIA–BLIP to be broadly implemented in diverse scientific studies and industrial applications.

关键词： illumination enable projection

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Single-shot real-time compressed ultrahigh-speed imaging enabled by a snapshot-to-video autoencoder

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Photonics Research 2021年第12期9卷 2464-2474页

作者： XIANGLEI LIU JOÃO MONTEIRO ISABELA ALBUQUERQUE YINGMING LAI CHENG JIANG SHIAN ZHANG TIAGO H.FALK jinyang liang CentreÉnergie Matériaux Télécommunications Institut National de la Recherche ScientifiqueVarennesQuébec J3X1S2Canada State Key Laboratory of Precision Spectroscopy East China Normal UniversityShanghai 200062China

Single-shot 2 D optical imaging of transient scenes is indispensable for numerous areas of *** existing techniques,compressed optical-streaking ultrahigh-speed photography(COSUP)uses a cost-efficient design to endow ultrahigh frame rates with off-the-shelf CCD and CMOS *** far,COSUP’s application scope is limited by the long processing time and unstable image quality in existing analytical-modeling-based video *** overcome these problems,we have developed a snapshot-to-video autoencoder(S2 V-AE)—which is a deep neural network that maps a compressively recorded 2 D image to a *** S2 V-AE preserves spatiotemporal coherence in reconstructed videos and presents a flexible structure to tolerate changes in input *** in compressed ultrahigh-speed imaging,the S2 V-AE enables the development of single-shot machine-learning assisted real-time(SMART)COSUP,which features a reconstruction time of 60 ms and a large sequence depth of 100 ***-COSUP is applied to wide-field multiple-particle tracking at 20,000 frames per *** a universal computational framework,the S2 V-AE is readily adaptable to other modalities in high-dimensional compressed ***-COSUP is also expected to find wide applications in applied and fundamental sciences.

关键词： frames video overcome

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High-fidelity image reconstruction for compressed ultrafast photography via an augmented-Lagrangian and deep-learning hybrid algorithm

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Photonics Research 2021年第2期9卷 I0023-I0030页

作者： CHENGSHUAI YANG YUNHUA YAO CHENGZHI JIN DALONG QI FENGYAN CAO YILIN HE JIALI YAO PENGPENG DING liang GAO TIANQING JIA jinyang liang ZHENRONG SUN SHIAN ZHANG State Key Laboratory of Precision Spectroscopy School of Physics and Electronic ScienceEast China Normal University Department of Electrical and Computer Engineering University of Illinois at Urbana-Champaign Institut National de la Recherche Scientifique Centreénergie Matériaux TélécommunicationsLaboratory of Applied Computational Imaging Collaborative Innovation Center of Extreme Optics Shanxi University Collaborative Innovation Center of Light Manipulations and Applications Shandong Normal University

Compressed ultrafast photography(CUP) is the fastest single-shot passive ultrafast optical imaging technique,which has shown to be a powerful tool in recording self-luminous or non-repeatable ultrafast ***, the low fidelity of image reconstruction based on the conventional augmented-Lagrangian(AL)and two-step iterative shrinkage/thresholding(Tw IST) algorithms greatly prevents practical applications of CUP, especially for those ultrafast phenomena that need high spatial resolution. Here, we develop a novel AL and deep-learning(DL) hybrid(i.e., AL+DL) algorithm to realize high-fidelity image reconstruction for CUP. The AL+DL algorithm not only optimizes the sparse domain and relevant iteration parameters via learning the dataset but also simplifies the mathematical architecture, so it greatly improves the image reconstruction accuracy. Our theoretical simulation and experimental results validate the superior performance of the AL+DL algorithm in image fidelity over conventional AL and Tw IST algorithms, where the peak signalto-noise ratio and structural similarity index can be increased at least by 4 d B(9 d B) and 0.1(0.05) for a complex(simple) dynamic scene, respectively. This study can promote the applications of CUP in related fields, and it will also enable a new strategy for recovering high-dimensional signals from low-dimensional detection.

关键词： image algorithm luminous

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High-spatial-resolution ultrafast framing imaging at 15 trillion frames per second by optical parametric amplification

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Advanced Photonics 2020年第5期2卷 53-63页

作者： Xuanke Zeng Shuiqin Zheng Yi Cai Qinggang Lin jinyang liang Xiaowei Lu Jingzhen Li Weixin Xie Shixiang Xu Shenzhen University College of Physics and Optoelectronic EngineeringShenzhen Key Lab of Micro-Nano Photonic Information TechnologyShenzhenChina Shenzhen University College of Electronic Information EngineeringShenzhenChina Institut National de la Recherche Scientifique CentreÉnergie Matériaux TélécommunicationsLaboratory of Applied Computational ImagingVarennesQuébecCanada

We report a framing imaging based on noncollinear optical parametric amplification(NCOPA),named FINCOPA,which applies NCOPA for the first time to single-shot ultrafast optical *** an experiment targeting a laser-induced air plasma grating,FINCOPA achieved 50 fs-resolved optical imaging with a spatial resolution of^83 lp∕mm and an effective frame rate of 10 trillion frames per second(Tfps).It has also successfully visualized an ultrafast rotating optical field with an effective frame rate of 15 *** has simultaneously a femtosecond-level temporal resolution and frame interval and a micrometer-level spatial *** outstanding spatial and temporal resolutions with an ultrahigh frame rate,FINCOPA will contribute to high-spatiotemporal resolution observations of ultrafast transient events,such as atomic or molecular dynamics in photonic materials,plasma physics,and laser inertial-confinement fusion.

关键词： ultrafast imaging spatiotemporal resolution frame rate noncollinear optical parametric amplification

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Single-shot compressed ultrafast photography: a review

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Advanced Photonics 2020年第1期2卷 41-56页

作者： Dalong Qi Shian Zhang Chengshuai Yang Yilin He Fengyan Cao Jiali Yao Pengpeng Ding liang Gao Tianqing Jia jinyang liang Zhenrong Sun Lihong V.Wange East China Normal University School of Physics and Electric ScienceState Key Laboratory of Precision SpectroscopyShanghaiChina Shanxi University Collaborative Innovation Center of Extreme OpticsTaiyuanChina University of Illinois at Urbana-Champaign Department of Electrical and Computer EngineeringUrbanaIllinoisUnited States Institut National de la Recherche Scientifique CentreÉnergie Matériaux TélécommunicationsLaboratory of Applied Computational ImagingVarennesQuébecCanada

Compressed ultrafast photography(CUP)is a burgeoning single-shot computational imaging technique that provides an imaging speed as high as 10 trillion frames per second and a sequence depth of up to a few hundred *** technique synergizes compressed sensing and the streak camera technique to capture nonrepeatable ultrafast transient events with a single *** recent unprecedented technical developments and extensions of this methodology,it has been widely used in ultrafast optical imaging and metrology,ultrafast electron diffraction and microscopy,and information security *** review the basic principles of CUP,its recent advances in data acquisition and image reconstruction,its fusions with other modalities,and its unique applications in multiple research fields.

关键词： ultrafast optical imaging compressed sensing computational imaging single-shot measurement

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Single-shot spectral-volumetric compressed ultrafast photography

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Advanced Photonics 2021年第4期3卷 35-40页

作者： Pengpeng Ding Yunhua Yao Dalong Qi Chengshuai Yang Fengyan Cao Yilin He Jiali Yao Chengzhi Jin Zhengqi Huang Li Deng Lianzhong Deng Tianqing Jia jinyang liang Zhenrong Sun Shian Zhang East China Normal University School of Physics and Electronic ScienceState Key Laboratory of Precision SpectroscopyShanghaiChina Institut National de la Recherche Scientifique CentreÉnergie Matériaux TélécommunicationsLaboratory of Applied Computational ImagingVarennesQuébecCanada Shanxi University Collaborative Innovation Center of Extreme OpticsTaiyuanChina

In ultrafast optical imaging,it is critical to obtain the spatial structure,temporal evolution,and spectral composition of the object with snapshots in order to better observe and understand unrepeatable or irreversible dynamic ***,so far,there are no ultrafast optical imaging techniques that can simultaneously capture the spatial–temporal–spectral five-dimensional(5D)information of dynamic *** break the limitation of the existing techniques in imaging dimensions,we develop a spectral-volumetric compressed ultrafast photography(SV-CUP)*** our SV-CUP,the spatial resolutions in the x,y and z directions are,respectively,0.39,0.35,and 3 mm with an 8.8 mm×6.3 mm field of view,the temporal frame interval is 2 ps,and the spectral frame interval is 1.72 *** demonstrate the excellent performance of our SV-CUP in spatial–temporal–spectral 5D imaging,we successfully measure the spectrally resolved photoluminescent dynamics of a 3D mannequin coated with CdSe quantum *** SV-CUP brings unprecedented detection capabilities to dynamic scenes,which has important application prospects in fundamental research and applied science.

关键词： ultrafast optical imaging multi-dimensional imaging computational imaging compressed sensing image reconstruction

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Metalens-Based Compressed Ultracompact Femtophotography:Analytical Modeling and Simulations

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Ultrafast Science 2024年第1期4卷 7-16页

作者： Miguel Marquez Giacomo Balistreri Roberto Morandotti Luca Razzari jinyang liang Centre Energie Materiaux Telecommunications Institut National de la Recherche ScientifiqueUniversite du Quebec1650 Boulevard Lionel-BouletVarennesQuebec J3X1P7Canada.

Single-shot 2-dimensional optical imaging of transient phenomena is indispensable for numerous areas of *** existing techniques,compressed ultrafast photography(CUP)using a chirped ultrashort pulse as active illumination can acquire nonrepetitive time-evolving events at hundreds of trillions of frames per ***,the bulky size and conventional configurations limit its reliability and application *** metalenses offer a promising solution for an ultracompact design with a stable performance by integrating the functions of a focusing lens and dispersive optical components into a single ***,existing metalens designs,typically optimized for the full visible spectrum with a relatively low spectral resolution,cannot be readily applied to active-illumination *** address these limitations,here,we propose single-shot compressed ultracompact femtophotography(CUF)that synergically combines the fields of nanophotonics,optical imaging,compressed sensing,and deep *** develop the theory of CUF’s data acquisition composed of temporal–spectral mapping,spatial encoding,temporal shearing,and spatiotemporal *** also develop CUF’s image reconstruction via deep ***,we design and evaluate CUF’s crucial components—a static binary transmissive mask,a superdispersive metalens,and a 2-dimensional ***,using numerical simulations,CUF’s feasibility is verified using 2 synthetic scenes:an ultrafast beam sweeping across a surface and the propagation of a terahertz Cherenkov wave.

关键词： Femto illumination hundreds

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Metabolic reprogramming: a new option for the treatment of spinal cord injury

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Neural Regeneration Research 2025年第4期20卷 1042-1057页

作者： Jiangjie Chen jinyang Chen Chao Yu Kaishun Xia Biao Yang Ronghao Wang Yi Li Kesi Shi Yuang Zhang Haibin Xu Xuesong Zhang Jingkai Wang Qixin Chen Chengzhen liang Department of Orthopedics The Second Affiliated Hospital of Zhejiang University School of MedicineHangzhouZhejiang ProvinceChina Orthopedics Research Institute of Zhejiang University Zhejiang UniversityHangzhouZhejiang ProvinceChina Key Laboratory of Motor System Disease Research and Precision Therapy of Zhejiang Province HangzhouZhejiang ProvinceChina Clinical Research Center of Motor System Disease of Zhejiang Province HangzhouZhejiang ProvinceChina Qiandongnan Prefecture People’s Hospital KailiGuizhou ProvinceChina Department of Orthopedics Fourth Medical CenterChinese PLA General HospitalBeijingChina

Spinal cord injuries impose a notably economic burden on society,mainly because of the severe after-effects they *** the ongoing development of various therapies for spinal cord injuries,their effectiveness remains ***,a deeper understanding of metabolism has opened up a new therapeutic opportunity in the form of metabolic *** this review,we explore the metabolic changes that occur during spinal cord injuries,their consequences,and the therapeutic tools available for metabolic *** spinal cord metabolism is characterized by independent cellular metabolism and intercellular metabolic ***,spinal cord injury results in metabolic disorders that include disturbances in glucose metabolism,lipid metabolism,and mitochondrial *** metabolic disturbances lead to corresponding pathological changes,including the failure of axonal regeneration,the accumulation of scarring,and the activation of *** rescue spinal cord injury at the metabolic level,potential metabolic reprogramming approaches have emerged,including replenishing metabolic substrates,reconstituting metabolic couplings,and targeting mitochondrial therapies to alter cell *** available evidence suggests that metabolic reprogramming holds great promise as a next-generation approach for the treatment of spinal cord *** further advance the metabolic treatment of the spinal cord injury,future efforts should focus on a deeper understanding of neurometabolism,the development of more advanced metabolomics technologies,and the design of highly effective metabolic interventions.

关键词： axons glycolysis metabolic reprogramming metabolism mitochondria neural regeneration neuroprotection oxidative phosphorylation spinal cord injury therapy

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