Linear Gain and Gain Saturation in a Photonic Free-Electron Laser

T. Denis, Klaus J. Boller, J.H.H. Lee, P.J.M. van der Slot, Marc van Dijk

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Photonic crystals are used to manipulate the generation of light, for example, stimulated emission can be enhanced. A
photonic free-electron laser (pFEL) applies this enhancement to generate widely tunable coherent Cerenkov radiation from
low energy electrons (keV) streaming through the photonic crystal. The lattice constant of the photonic crystal sets an output
frequency range that can be covered by varying the beam energy. The output power is scalable by increasing the number of
electron beams. To develop such lasers, we calculate the small signal gain of a pFEL by using the Pierce theory, originally
developed for slow-wave microwave tubes. We investigate the accuracy of the Pierce theory for pFELs by comparing the
results of the theory to the small-signal growth rate observed in particle-in-cell simulations. Results will be presented for a
low-energy (12.5 keV), low current (1A) electron beam propagating through a photonic crystal designed to operate at around
15 GHz.
Original languageEnglish
Publication statusPublished - 26 Aug 2012
Event34th International Free-Electron Laser Conference, FEL 2012 - Nara, Japan
Duration: 26 Aug 201231 Aug 2012
Conference number: 34


Conference34th International Free-Electron Laser Conference, FEL 2012
Abbreviated titleFEL


  • METIS-289009


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