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ultrafast imaging of Electronic Relaxation in Ortho-xylene： New Features from Fragmentation-Ion Spectroscopy

Chinese Physics Letters 2014年第12期31卷 130-133页

作者：刘玉柱 KNOPP Gregor 肖韶荣 GERBER Thomas College of Physics and Opto-electronics Engineering Nanjing University of Information Science & Technology Nanjing 210044 Paul Scherrer Institute Villigen 5232 Switzerland

After light absorption, a molecule can undergo ra- diationless processes, and photophysics is one of the important general types. The photophysical pro- cesses involve internal conversion （IC） due to elec- tronic nonadiabaticity and intersystem crossing （ISC） induced by spin-orbit coupling. In polyatomic molecules that are excited IC and ISC to vibronic to higher electronic states, levels of lower electronic states are two dominant mechanisms. With the ad- vent of femtosecond ultrashort pulse, tracking and controlling the ultrafast photophysical processes be- come realizable. Due to the fact that ISC requires a change in the spin of an electron, it is usually a slower process than IC. However, extensive reports show that ultrafast competing ISC exists in a number of systems. Re- cently, Richter et al. reported femtosecond ISC in cytosine. Martinez-Fernandez et al. simulated the deactivation dynamics of photo-excited 6-thioguanine using a direct surface hopping dynamics approach Their simulations show that 6-thioguanine is another example of a system showing ultrafast ISC that can compete with IC in the same time scale. Both the spin-orbit and the dynamic couplings are important to describe realistically the excited state dynamics of 6-thioguanine. A similar phenomenon has also been evidenced in the S1 state of benzene. The exper- imental results show that the ultrafast decay of the S1 state is due to competing IC and ISC processes and both processes occur on a femtosecond timescale. Spin-orbit coupling is highly effective when the in- volved states are nearly isoenergetic.

关键词： ultrafast imaging Electronic Relaxation Fragmentation-Ion Spectroscopy

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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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ultrafast quasi-three-dimensional imaging

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International Journal of Extreme Manufacturing 2023年第4期5卷 501-512页

作者： Yiling Lian Lan Jiang Jingya Sun Jiadong Zhou Yao Zhou Laser Micro/Nano Fabrication Laboratory School of Mechanical EngineeringBeijing Institute of TechnologyBeijing 100081People’s Republic of China Yangtze Delta Region Academy of Beijing Institute of Technology Jiaxing 314019People’s Republic of China Beijing Institute of Technology Chongqing Innovation Center Chongqing 401120People’s Republic of China Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(MOE)School of PhysicsBeijing Institute of TechnologyBeijing 100081People’s Republic of China Advanced Research Institute of Multidisciplinary Sciences Beijing Institute of TechnologyBeijing 100081People’s Republic of China

Understanding laser induced ultrafast processes with complex three-dimensional(3D)geometries and extreme property evolution offers a unique opportunity to explore novel physical phenomena and to overcome the manufacturing *** imaging offers exceptional spatiotemporal resolution and thus has been considered an effective ***,in conventional single-view imaging techniques,3D information is projected on a two-dimensional plane,which leads to significant information loss that is detrimental to understanding the full ultrafast ***,we propose a quasi-3D imaging method to describe the ultrafast process and further analyze spatial asymmetries of laser induced *** polarized laser pulses are adopted to illuminate reflection-transmission views,and binarization techniques are employed to extract contours,forming the corresponding two-dimensional *** rotating and multiplying the two-dimensional contour matrices obtained from the dual views,a quasi-3D image can be *** successfully reveals dual-phase transition mechanisms and elucidates the diffraction phenomena occurring outside the ***,the quasi-3D image confirms the spatial asymmetries of the picosecond plasma,which is difficult to achieve with two-dimensional *** findings demonstrate that quasi-3D imaging not only offers a more comprehensive understanding of plasma dynamics than previous imaging methods,but also has wide potential in revealing various complex ultrafast phenomena in related fields including strong-field physics,fluid dynamics,and cutting-edge manufacturing.

关键词： ultrafast imaging extraction and reconstruction quasi-three-dimension plasma diffraction

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Parametric amplification as a single-shot time-resolved off-harmonic probe for laser–matter interactions

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High Power Laser Science and Engineering 2023年第4期11卷 9-16页

作者： Filip Grepl Maksym Tryus Timofej Chagovets Daniele Margarone ELI Beamlines Facility The Extreme Light Infrastructure ERICDolníBˇrežanyCzech Republic Faculty of Nuclear Sciences and Physical Engineering Czech Technical University in PraguePragueCzech Republic

An optical probing of laser–plasma interactions can provide time-resolved measurements of plasma density;however,single-shot and multi-frame probing capabilities generally rely on complex setups with limited *** have demonstrated a new method for temporal resolution of the rapid dynamics(∼170 fs)of plasma evolution within a single laser shot based on the generation of several consecutive probe pulses from a single beta barium borate-based optical parametric amplifier using a fraction of the driver pulse with the possibility to adjust the central wavelengths and delays of particular pulses by optical delay *** flexibility and scalability of the proposed experimental technique are presented and discussed.

关键词： off-harmonic optical probing plasma diagnostics ultrafast imaging

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Recent advances in transient imaging:A computer graphics and vision perspective

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Visual Informatics 2017年第1期1卷 65-79页

作者： Adrian Jarabo Belen Masia Julio Marco Diego Gutierrez Universidad de Zaragoza-I3A Zaragoza 50018Spain

Transient imaging has recently made a huge impact in the computer graphics and computer vision *** capturing,reconstructing,or simulating light transport at extreme temporal resolutions,researchers have proposed novel techniques to show movies of light in motion,see around corners,detect objects in highly-scattering media,or infer material properties from a distance,to name a *** key idea is to leverage the wealth of information in the temporal domain at the pico or nanosecond resolution,infor-mation usually lost during the capture-time temporal *** paper presents recent advances in this field of transient imaging from a graphics and vision perspective,including capture techniques,analysis,applications and simulation.

关键词： Transient imaging ultrafast imaging Time-of-flight

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