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Intricate Plasma-Scattered Images and Spectra of Focused Femtosecond Laser Pulses

We report on some interesting phenomena in the focusing and scattering of femtosecond laser pulses in free space that provide insights on intense laser plasma interactions. The scattered image in the far field is analyzed and the connection with the observed structure of the plasma at the focus is d...

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Detalles Bibliográficos
Autores principales: Ooi, C. H. Raymond, Talib, Md. Ridzuan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5004177/
https://www.ncbi.nlm.nih.gov/pubmed/27571644
http://dx.doi.org/10.1038/srep32056
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author Ooi, C. H. Raymond
Talib, Md. Ridzuan
author_facet Ooi, C. H. Raymond
Talib, Md. Ridzuan
author_sort Ooi, C. H. Raymond
collection PubMed
description We report on some interesting phenomena in the focusing and scattering of femtosecond laser pulses in free space that provide insights on intense laser plasma interactions. The scattered image in the far field is analyzed and the connection with the observed structure of the plasma at the focus is discussed. We explain the physical mechanisms behind the changes in the colorful and intricate image formed by scattering from the plasma for different compressions, as well as orientations of plano-convex lens. The laser power does not show significant effect on the images. The pulse repetition rate above 500 Hz can affect the image through slow dynamics The spectrum of each color in the image shows oscillatory peaks due to interference of delayed pulse that correlate with the plasma length. Spectral lines of atomic species are identified and new peaks are observed through the white light emitted by the plasma spot. We find that an Ar gas jet can brighten the white light of the plasma spot and produce high resolution spectral peaks. The intricate image is found to be extremely sensitive and this is useful for applications in sensing microscale objects.
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spelling pubmed-50041772016-09-07 Intricate Plasma-Scattered Images and Spectra of Focused Femtosecond Laser Pulses Ooi, C. H. Raymond Talib, Md. Ridzuan Sci Rep Article We report on some interesting phenomena in the focusing and scattering of femtosecond laser pulses in free space that provide insights on intense laser plasma interactions. The scattered image in the far field is analyzed and the connection with the observed structure of the plasma at the focus is discussed. We explain the physical mechanisms behind the changes in the colorful and intricate image formed by scattering from the plasma for different compressions, as well as orientations of plano-convex lens. The laser power does not show significant effect on the images. The pulse repetition rate above 500 Hz can affect the image through slow dynamics The spectrum of each color in the image shows oscillatory peaks due to interference of delayed pulse that correlate with the plasma length. Spectral lines of atomic species are identified and new peaks are observed through the white light emitted by the plasma spot. We find that an Ar gas jet can brighten the white light of the plasma spot and produce high resolution spectral peaks. The intricate image is found to be extremely sensitive and this is useful for applications in sensing microscale objects. Nature Publishing Group 2016-08-30 /pmc/articles/PMC5004177/ /pubmed/27571644 http://dx.doi.org/10.1038/srep32056 Text en Copyright © 2016, The Author(s) http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Ooi, C. H. Raymond
Talib, Md. Ridzuan
Intricate Plasma-Scattered Images and Spectra of Focused Femtosecond Laser Pulses
title Intricate Plasma-Scattered Images and Spectra of Focused Femtosecond Laser Pulses
title_full Intricate Plasma-Scattered Images and Spectra of Focused Femtosecond Laser Pulses
title_fullStr Intricate Plasma-Scattered Images and Spectra of Focused Femtosecond Laser Pulses
title_full_unstemmed Intricate Plasma-Scattered Images and Spectra of Focused Femtosecond Laser Pulses
title_short Intricate Plasma-Scattered Images and Spectra of Focused Femtosecond Laser Pulses
title_sort intricate plasma-scattered images and spectra of focused femtosecond laser pulses
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5004177/
https://www.ncbi.nlm.nih.gov/pubmed/27571644
http://dx.doi.org/10.1038/srep32056
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