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Reflection of intense laser light from microstructured targets as a potential diagnostic of laser focus and plasma temperature

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Abstract

The spatial-intensity profile of light reflected during the interaction of an intense laser pulse with a microstructured target is investigated experimentally and the potential to apply this as a diagnostic of the interaction physics is explored numerically. Diffraction and speckle patterns are measured in the specularly reflected light in the cases of targets with regular groove and needle-like structures, respectively, highlighting the potential to use this as a diagnostic of the evolving plasma surface. It is shown, via ray-tracing and numerical modelling, that for a laser focal spot diameter smaller than the periodicity of the target structure, the reflected light patterns can potentially be used to diagnose the degree of plasma expansion, and by extension the local plasma temperature, at the focus of the intense laser light. The reflected patterns could also be used to diagnose the size of the laser focal spot during a high-intensity interaction when using a regular structure with known spacing.

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DOI:10.1017/hpl.2018.63

基金项目:The authors acknowledge the expertise of the STFC Central Laser Facility staff and the Detector and Target Laboratory staff at the Institut fur Kernphysik, Technische Universitat Darmstadt. Simulations were performed using the EPOCH PIC code (developed under EPSRC grant number EP/G054940/1), running on the ARCHER high performance computer, with access provided via the EPSRC-funded Plasma Physics HEC Consortia (EP/L000237/1). This work is financially supported by EPSRC (grant numbers EP/R006202/1 and EP/K022415/1) and the European Union Horizon 2020 research and innovation programme under grant agreement number 654148 Laserlab-Europe. The data presented in this paper is available at http://dx.doi.org/10.15129/6805696a-13c1-4c56-a2db-d5eb5a471d33.

收稿日期:2018-07-31

录用日期:2018-10-19

网络出版日期:2018-11-13

作者单位    点击查看

J. Jarrett:Department of Physics SUPA, University of Strathclyde, G4 0NG, UK
M. King:Department of Physics SUPA, University of Strathclyde, G4 0NG, UK
R. J. Gray:Department of Physics SUPA, University of Strathclyde, G4 0NG, UK
N. Neumann:Institut für Kernphysik, Technische Universit?t Darmstadt, 64289 Darmstadt, Germany
L. D?hl:York Plasma Institute, University of York, YO10 5DD, UK
C. D. Baird:York Plasma Institute, University of York, YO10 5DD, UK
T. Ebert:Institut für Kernphysik, Technische Universit?t Darmstadt, 64289 Darmstadt, Germany
M. Hesse:Institut für Kernphysik, Technische Universit?t Darmstadt, 64289 Darmstadt, Germany
A. Tebartz:Institut für Kernphysik, Technische Universit?t Darmstadt, 64289 Darmstadt, Germany
D. R. Rusby:STFC-Rutherford Appleton Laboratory, Didcot, OX11 0QX, UKDepartment of Physics SUPA, University of Strathclyde, G4 0NG, UK
N. C. Woolsey:York Plasma Institute, University of York, YO10 5DD, UK
D. Neely:STFC-Rutherford Appleton Laboratory, Didcot, OX11 0QX, UKDepartment of Physics SUPA, University of Strathclyde, G4 0NG, UK
M. Roth:Institut für Kernphysik, Technische Universit?t Darmstadt, 64289 Darmstadt, Germany
P. McKenna:Department of Physics SUPA, University of Strathclyde, G4 0NG, UK

联系人作者:P. McKenna(paul.mckenna@strath.ac.uk)

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引用该论文

J. Jarrett, M. King, R. J. Gray, N. Neumann, L. D?hl, C. D. Baird, T. Ebert, M. Hesse, A. Tebartz, D. R. Rusby, N. C. Woolsey, D. Neely, M. Roth, and P. McKenna, "Reflection of intense laser light from microstructured targets as a potential diagnostic of laser focus and plasma temperature," High Power Laser Science and Engineering 7(1), e2 (2019)

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