Tailored terahertz pulses from a laser-modulated electronbeam
We present a new method to generate steady and tunable,coherent, broadband terahertz radiation from a relativistic electron beammodulated by a femtosecond laser. We have demonstrated this in theelectron storage ring at the Advanced Light Source. Interaction of anelectron beam with a femtosecond laser pulse copropagating through awiggler modulates the electron energies within a short slice of theelectron bunch with about the same duration of the laser pulse. The bunchdevelops a longitudinal density perturbation due to the dispersion ofelectron trajectories, and the resulting hole emits short pulses oftemporally and spatially coherent terahertz pulses synchronized to thelaser. We present measurements of the intensity and spectra of thesepulses. This technique allows tremendous flexibility in shaping theterahertz pulse by appropriate modulation of the laser pulse.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Director. Office of Science. Office of AdvancedScientific Computing Research. Office of Basic Energy Sciences and Officeof High Energy Physics
- DOE Contract Number:
- DE-AC02-05CH11231
- OSTI ID:
- 894712
- Report Number(s):
- LBNL-58991-JArt; R&D Project: 458121; BnR: KC0204016
- Journal Information:
- Physical Review Letters, Vol. 96, Issue 16; Related Information: Journal Publication Date: April 28,2006
- Country of Publication:
- United States
- Language:
- English
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