Deep saturated Free Electron Laser oscillators and frozen spikes

P.L. Ottaviani, S. Pagnutti, G. Dattoli, E. Sabia, V. Petrillo, P.J.M. van der Slot, S. Biedron, S. Milton

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13 Citations (Scopus)


We analyze the behavior of Free Electron Laser (FEL) oscillators operating in the deep saturated regime and point out the formation of sub-peaks of the optical pulse. These are very stable configurations and the sub-peaks are found to have a duration corresponding to the coherence length. We speculate on the physical mechanisms underlying their growth and attempt an identification with natural mode-locked structures in FEL oscillators. Their impact on the intra-cavity nonlinear harmonic generation is also discussed along with the possibility of exploiting them as cavity out-coupler


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