Harmonic lasing in a free-electron-laser amplifier

B W J McNeil, G.R.M. Robb, M.W. Poole, N.R. Thompson

Research output: Contribution to journalLetterpeer-review

90 Citations (Scopus)


A method is demonstrated that allows a planar wiggler high-gain Free-Electron-Laser (FEL) amplifier to lase so that the interaction with an odd harmonic of the radiation field dominates that of the fundamental. This harmonic lasing of the FEL is achieved by disrupting the electron interaction with the usually dominant fundamental while allowing that of a harmonic interaction to evolve unhindered. The disruption is achieved by a series of relative phase changes between the electrons and the ponderomotive potentials of both the fundamental and harmonic fields. Such phase changes are relatively easy to implement and some current FEL designs would require little or no structural modification to test the scheme.
Original languageEnglish
Article number084801
Number of pages4
JournalPhysical Review Letters
Issue number8
Publication statusPublished - Feb 2006


  • lasers
  • amplifier
  • electrons
  • free-electron-laser
  • harmonic lasing
  • phase changes


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