TY  - CONF
AU  - Gopal, Amrutha
AU  - May, Torsten
AU  - Singh, Pushkar
AU  - Herzer, Sven
AU  - Ziegler, Wolfgang
AU  - Paulus, Gerhard G.
AU  - Schmidt, Albrecht
AU  - Reinhard, Andreas
AU  - Dillner, Ulrich
AU  - Meyer, Hans-Georg
AU  - Karmakar, Anupam
AU  - Brömmel, Dirk
AU  - Gibbon, Paul
TI  - 700μJ THz pulses from a laser-driven particle accelerator
CY  - Washington, DC
PB  - Society of Photo-Optical Instrumentation Engineers (SPIE)
M1  - FZJ-2014-01797
SP  - 123-150
PY  - 2013
AB  - 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.
T2  - SPIE Optics + Optoelectronics
CY  - 15 Apr 2013 - 18 Apr 2013, Prague (Czech Republic)
Y2  - 15 Apr 2013 - 18 Apr 2013
M2  - Prague, Czech Republic
LB  - PUB:(DE-HGF)8 ; PUB:(DE-HGF)7
UR  - <Go to ISI:>//WOS:000323544600039
DO  - DOI:10.1117/12.2017254
UR  - https://juser.fz-juelich.de/record/151970
ER  -