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Proceedings Paper

700 J THz pulses from a laser-driven particle accelerator
Author(s): Amrutha Gopal; Torsten May; Pushkar Singh; Sven Herzer; Wolfgang Ziegler; Gerhard G. Paulus; Albrecht Schmidt; Andreas Reinhard; Ulrich Dillner; Hans-Georg Meyer; Anupam Karmakar; Dirk Broemmel; Paul Gibbon
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Paper Abstract

Here we report a laser plasma-driven source of T-rays with the highest pulse energy ever recorded in a laboratory. T-rays are emitted from the rear surface of a solid target in the non-collinear direction at incident laser intensities ~ 1019 W/cm2. Pulse energy measurements reported T-ray pulses with peak energies no less than 700 μJ. Temporal measurements using a single-shot electro-optic method showed the presence of sub-picosecond T-ray pulses with 570 fs duration, thus rendering the peak-power of the source higher even than that of state-of-the-art synchrotrons. A conversion efficiency of higher than 10−3 and an average power of 7 mW makes it the most efficient compact and powerful THz source known today. Spectral analysis revealed the presences of frequencies ranging from 0.1 − 133 THz, while most of the energy is localised in the low frequency region. The dependence of T-ray yield on incident laser energy is linear and shows no signs of saturation. The spatial distribution of the recorded T-rays indicates that most of the T-rays are emitted in the non-collinear direction from the rear-surface of a solid target and the contribution in the forward direction is very small. 2D particle-in-cell simulations show the presence of transient current at the target rear surface.

Paper Details

Date Published: 9 May 2013
PDF: 6 pages
Proc. SPIE 8779, Laser Acceleration of Electrons, Protons, and Ions II; and Medical Applications of Laser-Generated Beams of Particles II; and Harnessing Relativistic Plasma Waves III, 87791Z (9 May 2013); doi: 10.1117/12.2017254
Show Author Affiliations
Amrutha Gopal, Friedrich-Schiller-Univ. Jena (Germany)
Helmholtz Institute Jena (Germany)
Torsten May, Institut für Photonische Technologien e.V. (Germany)
Pushkar Singh, Friedrich-Schiller-Univ. Jena (Germany)
Sven Herzer, Friedrich-Schiller-Univ. Jena (Germany)
Helmholtz Institute Jena (Germany)
Wolfgang Ziegler, Friedrich-Schiller-Univ. Jena (Germany)
Helmholtz Institute Jena (Germany)
Gerhard G. Paulus, Friedrich-Schiller-Univ. Jena (Germany)
Helmholtz Institute Jena (Germany)
Albrecht Schmidt, Friedrich-Schiller-Univ. Jena (Germany)
Andreas Reinhard, Friedrich-Schiller-Univ. Jena (Germany)
Ulrich Dillner, Institut für Photonische Technologien e.V. (Germany)
Hans-Georg Meyer, Institut für Photonische Technologien e.V. (Germany)
Anupam Karmakar, Forschungzentrum Jülich GmbH (Germany)
Dirk Broemmel, Forschungzentrum Jülich GmbH (Germany)
Paul Gibbon, Forschungzentrum Jülich GmbH (Germany)


Published in SPIE Proceedings Vol. 8779:
Laser Acceleration of Electrons, Protons, and Ions II; and Medical Applications of Laser-Generated Beams of Particles II; and Harnessing Relativistic Plasma Waves III
Eric Esarey; Dino A. Jaroszynski; Carl B. Schroeder; Wim P. Leemans; Kenneth W. D. Ledingham, Editor(s)

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