Single-pulse ultrafast real-time simultaneous planar imaging of femtosecond laser-nanoparticle dynamics in flames  

作　　者：Yogeshwar Nath Mishra Peng Wang Florian J.Bauer Murthy S.Gudipati Lihong V.Wang 

机构地区：[1]Caltech Optical Imaging Laboratory,Andrew and Peggy Cheng Department of Medical Engineering,Department of Electrical Engineering,California Institute of Technology,1200 East California Boulevard,Mail Code 138-78,Pasadena,CA 91125,USA [2]Science Division,Jet Propulsion Laboratory,California Institute of Technology,4800 Oak Grove Drive,Pasadena,CA 91109,USA [3]Lehrstuhl für Technische Thermodynamik(LTT)and Erlangen Graduate School in Advanced Optical Technologies(SAOT),Universität Erlangen-Nürnberg,Erlangen 91058,Germany

出　　处：《Light(Science & Applications)》2024年第10期2312-2320,共9页光（科学与应用)（英文版）

基　　金：the Swedish Research Council for the financial support of grant#IPD2018-06783;Part of the work of Y.N.M.that was enabled by JPL was carried out at the Jet Propulsion Laboratory,California Institute of Technology,under a contract with NASA(80NM0018D0004);MSG thanks funding from JPL JROC and NASA SSW programs.

摘　　要：The creation of carbonaceous nanoparticles and their dynamics in hydrocarbon flames are still debated in environmental,combustion,and material sciences.In this study,we introduce single-pulse femtosecond laser sheetcompressed ultrafast photography(fsLS-CUP),an ultrafast imaging technique specifically designed to shed light on and capture ultrafast dynamics stemming from interactions between femtosecond lasers and nanoparticles in flames in a single-shot.fsLS-CUP enables the first-time real-time billion frames-per-second(Gfps)simultaneous twodimensional(2D)imaging of laser-induced fluorescence(LIF)and laser-induced heating(LIH)that are originated from polycyclic aromatic hydrocarbons(PAHs)and soot particles,respectively.Furthermore,fsLS-CUP provides the real-time spatiotemporal map of femtosecond laser-soot interaction as elastic light scattering(ELS)at an astonishing 250 Gfps.In contrast to existing single-shot ultrafast imaging approaches,which are limited to millions of frames per second only and require multiple laser pulses,our method employs only a single pulse and captures the entire dynamics of laserinduced signals at hundreds of Gfps.Using a single pulse does not change the optical properties of nanoparticles for a following pulse,thus allowing reliable spatiotemporal mapping.Moreover,we found that particle inception and growth are derived from precursors.In essence,as an imaging modality,fsLS-CUP offers ultrafast 2D diagnostics,contributing to the fundamental understanding of nanoparticle’s inception and broader applications across different fields,such as material science and biomedical engineering.

关 键 词：PULSE SCATTERING dynamics 

分 类 号：TB383[一般工业技术—材料科学与工程]