Open AccessIntense terahertz pulses from SLAC electron beams using coherent transition radiation
Author(s) -
Ziran Wu,
Alan Fisher,
John Goodfellow,
M. Fuchs,
Dan Daranciang,
Mark Hogan,
H. Loos,
Aaron M. Lindenberg
Publication year - 2013
Publication title -
review of scientific instruments
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.605
H-Index - 165
eISSN - 1089-7623
pISSN - 0034-6748
DOI - 10.1063/1.4790427
Subject(s) - terahertz radiation , physics , femtosecond , transition radiation , optics , electron , laser , linear particle accelerator , pulse duration , photomixing , terahertz spectroscopy and technology , radiation , optoelectronics , far infrared laser , beam (structure) , nuclear physics , terahertz metamaterials
SLAC has two electron accelerators, the Linac Coherent Light Source (LCLS) and the Facility for Advanced Accelerator Experimental Tests (FACET), providing high-charge, high-peak-current, femtosecond electron bunches. These characteristics are ideal for generating intense broadband terahertz (THz) pulses via coherent transition radiation. For LCLS and FACET respectively, the THz pulse duration is typically 20 and 80 fs RMS and can be tuned via the electron bunch duration; emission spectra span 3-30 THz and 0.5 THz-5 THz; and the energy in a quasi-half-cycle THz pulse is 0.2 and 0.6 mJ. The peak electric field at a THz focus has reached 4.4 GV/m (0.44 V/Å) at LCLS. This paper presents measurements of the terahertz pulses and preliminary observations of nonlinear materials response.
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