Temporal characterization of femtosecond laser-plasma-accelerated electron bunches using terahertz radiation.
The temporal profile of relativistic laser-plasma-accelerated electron bunches has been characterized. Coherent transition radiation at THz frequencies, emitted at the plasma-vacuum boundary, was measured through electro-optic sampling. Frequencies up to the crystal detection limit of 4 THz were observed. Comparison between data and theory indicates that THz radiation from bunches with structure shorter than approximately = 50 fs (root-mean-square) is emitted. The measurement demonstrates both shot-to-shot stability of the laser-plasma accelerator and femtosecond synchronization between bunch and probe beam.
Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720, USA.
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J
van Tilborg
C B
CB
Schroeder
C V
CV
Filip
Cs
C
Tóth
C G R
CG
Geddes
G
G
Fubiani
R
R
Huber
R A
RA
Kaindl
E
E
Esarey
W P
WP
Leemans