Phys. Rev. Lett. 93, 264801 (2004) [4 pages]Enhanced Coherent Emission of Terahertz Radiation by Energy-Phase Correlation in a Bunched Electron BeamReceived 19 March 2004; published 28 December 2004 We report the first observation of enhanced coherent emission of terahertz radiation in a compact free electron laser. A radio-frequency (rf) modulated electron beam is passed through a magnetic undulator emitting coherent radiation at harmonics of the rf with a phase which depends on the electron drift velocity. A proper correlation between the energy and phase distributions of the electrons in the bunch has been exploited to lock in phase the radiated field, resulting in over 1 order of magnitude enhancement of the coherent emission. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.264801
DOI:
10.1103/PhysRevLett.93.264801
PACS:
41.60.Cr
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