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| Hauptseite > Publikationsdatenbank > 700μJ THz pulses from a laser-driven particle accelerator |
| Hauptseite > Publikationsdatenbank > 700μJ THz pulses from a laser-driven particle accelerator |
| Contribution to a conference proceedings/Contribution to a book | FZJ-2014-01797 |
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2013
Society of Photo-Optical Instrumentation Engineers (SPIE)
Washington, DC
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Please use a persistent id in citations: doi:10.1117/12.2017254
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 therear surface of a solid target in the non-collinear direction at incident laser intensities ~ 10^19 W/cm^2. 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 pulseswith 570 fs duration, thus rendering the peak-power of the source higher even than that of state-of-the-art synchrotrons. A conversion efficiencyof 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-cellsimulations show the presence of transient current at the target rear surface.
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