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Updated: Aug 19, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
Enhanced coherent emission of terahertz radiation by energy-phase correlation in a bunched electron beam
A Doria1, G P Gallerano, E Giovenale
1Ente per le Nuove Tecnologie l'Energia e l'Ambiente (ENEA), UTS Tecnologie Fisiche Avanzate, Sezione Laser ed Acceleratori, P.O. Box 65, 00044 Frascati, Italy.
Abstract:
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.
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