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The Michelson resonator free-electron laser. I. Passive mode structure and mode decay

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2 Author(s)
Szarmes, E.B. ; Dept. of Phys., Duke Univ., Durham, NC, USA ; Madey, John M.J.

A general analysis of the evolution of phase locking in an RF linac-driven Michelson resonator free-electron laser (FEL) is presented. By providing a delay of one RF period in the secondary arm of the interferometer, successive optical pulses can be coupled at the beamsplitter, so that they build up from noise with a definite phase relationship. Phase locking is described in terms of longitudinal mode decay by extracting the mode losses directly from the passive frequency response of the resonator. The analyses predict significant mode structure simplification in microsecond macropulses, so that high-resolution spectroscopy is feasible on RF linac-driven FELs. Simulations of the perfectly tuned Michelson resonator FEL are described from spontaneous radiation to saturation, using a one-dimensional pulse propagation code. Excellent agreement with the analytical results in the small-signal regime is demonstrated

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Quantum Electronics, IEEE Journal of  (Volume:29 ,  Issue: 2 )