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APS » Journals » Phys. Rev. Lett. » Volume 91 » Issue 7
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Phys. Rev. Lett. 91, 074802 (2003) [4 pages]

Observation of Terahertz Emission from a Laser-Plasma Accelerated Electron Bunch Crossing a Plasma-Vacuum Boundary

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W. P. Leemans, C. G. R. Geddes*, J. Faure, Cs. Tóth, J. van Tilborg†, C. B. Schroeder, E. Esarey, G. Fubiani‡, D. Auerbach, B. Marcelis, M. A. Carnahan, R. A. Kaindl, J. Byrd, and M. C. Martin
Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720, USA

Received 14 April 2003; published 14 August 2003

Coherent radiation in the 0.3–3 THz range has been generated from femtosecond electron bunches at a plasma-vacuum boundary via transition radiation. The bunches produced by a laser-plasma accelerator contained 1.5 nC of charge. The THz energy per pulse within a limited 30 mrad collection angle was 3–5 nJ and scaled quadratically with bunch charge, consistent with coherent emission. Modeling indicates that this broadband source produces about 0.3   μJ per pulse within a 100 mrad angle, and that increasing the transverse plasma size and electron beam energy could provide more than 100   μJ/pulse.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.91.074802
DOI:
10.1103/PhysRevLett.91.074802
PACS:
41.75.Ht, 07.57.Hm, 41.75.Jv

*Also at University of California at Berkeley.

†Also at Technische Universiteit Eindhoven, the Netherlands.

‡Also at Université de Paris XI, Orsay, France.

 
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