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Gaussian-Schell analysis of the transverse spatial properties of high-harmonic beams

David T. Lloyd, Kevin O’Keeffe, Patrick N. Anderson, Simon M. Hooker, Kevin O'Keeffe Orcid Logo

Scientific Reports, Volume: 6, Start page: 30504

Swansea University Author: Kevin O'Keeffe Orcid Logo

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DOI (Published version): 10.1038/srep30504

Abstract

High harmonic generation (HHG) is a compact source of coherent, ultrafast soft x-ray radiation. HHG is increasingly being used as a source to image biological and physical systems. However, many imaging techniques such as coherent diffractive imaging, and ptychography require coherent illumination....

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Published in: Scientific Reports
ISSN: 2045-2322
Published: 2016
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URI: https://cronfa.swan.ac.uk/Record/cronfa30080
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spelling 2020-06-25T14:54:51.0831133 v2 30080 2016-09-16 Gaussian-Schell analysis of the transverse spatial properties of high-harmonic beams e17dfae9042b113b28e8340ea1572db4 0000-0003-2085-0806 Kevin O'Keeffe Kevin O'Keeffe true false 2016-09-16 SPH High harmonic generation (HHG) is a compact source of coherent, ultrafast soft x-ray radiation. HHG is increasingly being used as a source to image biological and physical systems. However, many imaging techniques such as coherent diffractive imaging, and ptychography require coherent illumination. Characterization the spatial coherence of HHG sources is vital if these sources are to kind widespread applications. Here a new method for characterizing coherent radiation is used to investigate the near- and far- field spatial properties of high harmonic radiation generated in a gas cell. The intensity distribution, wavefront curvature, and complex coherence factor are measured for a range of harmonic orders, and the Gaussian-Schell model is used to determine the properties of the harmonic beam in the plane of generation. Our results show the measured spatial properties of the harmonic beam are consistent with the finite spatial coherence of the driving laser beam as well as variations of the atomic dipole phase. These findings are used to suggest new approaches for controlling and optimizing the spatial properties of light for imaging applications. Journal Article Scientific Reports 6 30504 2045-2322 High harmonic generation, pulse metrology, coherent imaging, ultrafast optics 28 7 2016 2016-07-28 10.1038/srep30504 COLLEGE NANME Physics COLLEGE CODE SPH Swansea University EPSRC 2020-06-25T14:54:51.0831133 2016-09-16T08:52:43.2031221 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics David T. Lloyd 1 Kevin O’Keeffe 2 Patrick N. Anderson 3 Simon M. Hooker 4 Kevin O'Keeffe 0000-0003-2085-0806 5 0030080-29092016165524.pdf Gold_OA_Gaussian_Schell_VOR.pdf 2016-09-29T16:55:24.6870000 Output 805026 application/pdf Version of Record true 2016-09-29T00:00:00.0000000 This work is licensed under a Creative Commons Attribution 4.0 International License true http://creativecommons.org/licenses/by/4.0/ 0030080-16092016085418.pdf Sci_report_submission.pdf 2016-09-16T08:54:18.8170000 Output 910068 application/pdf Accepted Manuscript true 2016-09-16T00:00:00.0000000 true
title Gaussian-Schell analysis of the transverse spatial properties of high-harmonic beams
spellingShingle Gaussian-Schell analysis of the transverse spatial properties of high-harmonic beams
Kevin O'Keeffe
title_short Gaussian-Schell analysis of the transverse spatial properties of high-harmonic beams
title_full Gaussian-Schell analysis of the transverse spatial properties of high-harmonic beams
title_fullStr Gaussian-Schell analysis of the transverse spatial properties of high-harmonic beams
title_full_unstemmed Gaussian-Schell analysis of the transverse spatial properties of high-harmonic beams
title_sort Gaussian-Schell analysis of the transverse spatial properties of high-harmonic beams
author_id_str_mv e17dfae9042b113b28e8340ea1572db4
author_id_fullname_str_mv e17dfae9042b113b28e8340ea1572db4_***_Kevin O'Keeffe
author Kevin O'Keeffe
author2 David T. Lloyd
Kevin O’Keeffe
Patrick N. Anderson
Simon M. Hooker
Kevin O'Keeffe
format Journal article
container_title Scientific Reports
container_volume 6
container_start_page 30504
publishDate 2016
institution Swansea University
issn 2045-2322
doi_str_mv 10.1038/srep30504
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Physics{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Physics
document_store_str 1
active_str 0
description High harmonic generation (HHG) is a compact source of coherent, ultrafast soft x-ray radiation. HHG is increasingly being used as a source to image biological and physical systems. However, many imaging techniques such as coherent diffractive imaging, and ptychography require coherent illumination. Characterization the spatial coherence of HHG sources is vital if these sources are to kind widespread applications. Here a new method for characterizing coherent radiation is used to investigate the near- and far- field spatial properties of high harmonic radiation generated in a gas cell. The intensity distribution, wavefront curvature, and complex coherence factor are measured for a range of harmonic orders, and the Gaussian-Schell model is used to determine the properties of the harmonic beam in the plane of generation. Our results show the measured spatial properties of the harmonic beam are consistent with the finite spatial coherence of the driving laser beam as well as variations of the atomic dipole phase. These findings are used to suggest new approaches for controlling and optimizing the spatial properties of light for imaging applications.
published_date 2016-07-28T03:36:42Z
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score 11.013194

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