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Albert, O.

Paper Title Page
WEPP138 Experimental Demonstration of Ultrashort μJ-Class Pulses in the Terahertz Regime from a Laser Wakefield Accelerator 2818
 
  • G. R.D. Plateau, C. G.R. Geddes, N. H. Matlis, C. B. Schroeder, C. Toth, J. van Tilborg
    LBNL, Berkeley, California
  • O. Albert
    LOA, Palaiseau
  • E. Esarey, W. Leemans
    University of Nevada, Reno, Reno, Nevada
 
  Ultrashort terahertz pulses with energies in the μJ range can be generated with laser wakefield accelerators (LWFA), which are novel, compact accelerators that produce ultrashort electron bunches with energies up to 1 GeV* and energy spreads of a few-percent. Laser pulses interacting with a plasma create accelerated electrons which upon exiting the plasma emit terahertz pulses via transition radiation. Because they are only tens of femtoseconds long, electron bunches can radiate coherently (CTR) in a wide bandwidth (~ 1 - 10 THz) yielding terahertz pulses of high intensity**,***. In addition to providing a non-invasive bunch-length diagnostic**** and thus feedback for the LWFA, these high peak power THz pulses are suitable for high field (MV/cm) pump-probe experiments. Here we present energy-based measurements using a Golay cell and a single-shot electro-optic technique which were used to characterize the full waveform of these μJ-class THz pulses, including phase and amplitude information.

*W. P. Leemans et al. N. P. 2/696 (2006).
**W. P. Leemans et al. P. R.L. 91/074802 (2003).
***C. B. Schroeder et al. P. R.E 69/016501 (2004).
****J. van Tilborg et al. P. R.L. 96/014801 (2006).