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search.filters.applied.f.access: openAccess Ă— Author: Reinhard, A. Ă—

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    Observation of energetic terahertz pulses from relativistic solid density plasmas
    (Bristol : IOP, 2012) Gopal, A.; May, T.; Herzer, S.; Reinhard, A.; Minardi, S.; Schubert, M.; Dillner, U.; Pradarutti, B.; Polz, J.; Gaumnitz, T.; Kaluza, M.C.; Jäckel, O.; Riehemann, S.; Ziegler, W.; Gemuend, H-P.; Meyer, H-G.; Paulus, G.G.
    We report the first experimental observation of terahertz (THz) radiation from the rear surface of a solid target while interacting with an intense laser pulse. Experimental and two-dimensional particle-in-cell simulations show that the observed THz radiation is mostly emitted at large angles to the target normal. Numerical results point out that a large part of the emission originates from a micron-scale plasma sheath at the rear surface of the target, which is also responsible for the ion acceleration. This opens a perspective for the application of THz radiation detection for on-site diagnostics of particle acceleration in laser-produced plasmas.
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    An investigation on THz yield from laser-produced solid density plasmas at relativistic laser intensities
    ([London] : IOP, 2018) Herzer, S.; Woldegeorgis, A.; Polz, J.; Reinhard, A.; Almassarani, M.; Beleites, B.; Ronneberger, F.; Grosse, R.; Paulus, G.G.; HĂĽbner, U.; May, T.; Gopal, A.
    We experimentally characterize the generation of high-power terahertz radiation (THz) at the rear surface of a target irradiated by multiple laser pulses. A detailed dependence of the THz yield as a function of laser pulse duration, energy, target material and thickness is presented. We studied the THz radiation emitted mainly in two directions from the target rear surface, namely target normal (acceptance angle 0.87 sr) and non-collinear direction (perpendicular to the target normal direction—acceptance angle 4.12 sr). Independent measurements based on electro-optic diagnostics and pyroelectric detector were employed to estimate the THz yield. Most of the energy is emitted at large angles relative to the target normal direction. THz yield increases with incident laser intensity and thinner targets are better emitters of THz radiation compared to thicker ones.