Echo enabled harmonic generation free electron laser in a mode-locked configuration

Brian McNeil, James Robert Henderson

Research output: Contribution to journalLetterpeer-review

4 Citations (Scopus)
207 Downloads (Pure)


Echo Enabled Harmonic Generation (EEHG) is a method of harmonic up-shifting
proposed to extend the temporal coherence properties of Free Electron Lasers (FEL) at shorter wavelengths where coherent laser seed fields are not available. Previous theoretical studies of EEHG have applied periodic boundary conditions to the electron distribution in phase space. It is shown that when these periodic boundary conditions are removed a temporal comb of enhanced electron microbunching is revealed. By matching this comb structure in the electron microbunching to the radiation modes that are generated in a Mode-Locked Optical Klystron (MLOK) FEL configuration, a train of short radiation pulses can be generated.
Original languageEnglish
Article number64001
Number of pages5
JournalEPL: A Letters Journal Exploring the Frontiers of Physics
Publication statusPublished - 2012


  • free-electron lasers
  • X- and -ray lasers
  • ultrafast processes
  • optical pulse generation and pulse compression


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