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
Lihong V. Wang (LVW@caltech.edu)
Published:31 October 2024,
Published Online:29 August 2024,
Received:18 January 2024,
Revised:13 August 2024,
Accepted:15 August 2024
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Mishra, Y. N. et al. Single-pulse ultrafast real-time simultaneous planar imaging of femtosecond laser-nanoparticle dynamics in flames. Light: Science & Applications, 13, 2312-2320 (2024).
Mishra, Y. N. et al. Single-pulse ultrafast real-time simultaneous planar imaging of femtosecond laser-nanoparticle dynamics in flames. Light: Science & Applications, 13, 2312-2320 (2024). DOI: 10.1038/s41377-024-01588-x.
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 sheet-compressed 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 two-dimensional (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 laser-induced 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.
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