Application of harmonics imaging to focal spot measurements of the "PETAL" laser.

Authors :: Raffestin, D.
Boutoux, G.
Blanchot, N.
Batani, D.
D'Humières, E.
Moreno, Q.
Longhi, T.
Coïc, H.
Granet, F.
Rault, J.
Liberatore, C.
Jakubowska, K.
Tikhonchuk, V.
Source :: Journal of Applied Physics; 12/28/2019, Vol. 126 Issue 24, p1-9, 9p, 5 Diagrams, 5 Graphs
Publication Year :: 2019
Abstract: By using numerical simulations and experimental campaigns on a small-scale laser facility, the concept of the focal spot imaging on harmonics of laser frequency is developed and implemented on the Laser MegaJoule (LMJ)/PETawatt Aquitaine Laser (PETAL) facility. The Two/Three ω Imaging System was activated and validated during the first 2017–2019 interaction campaigns of PETAL on the LMJ. It provides major information on focal spot characteristics on a target. Such an approach could be easily applied to any high-intensity facility in the relativistic intensity regime (>10<superscript>18</superscript> W cm<superscript>−2</superscript>). [ABSTRACT FROM AUTHOR]

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