Superradiant cascade in a seeded free-electron laser

L. Giannessi, M. Bellaveglia, E. Chiadroni, A. Cianchi, M.E. Couprie, M. Del Franco, G. Di Pirro, M. Ferrario, G. Gatti, M. Labat, G. Marcus, A. Mostacci, A. Petralia, V. Petrillo, M. Quattromini, J.V. Rau, S. Spampinati, V. Surrenti

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We report measurements demonstrating the concept of the free-electron laser (FEL) superradiant cascade. Radiation (λrad=200 nm) at the second harmonic of a short, intense seed laser pulse (λseed= 400 nm) was generated by the cascaded FEL scheme at the transition between the modulator and radiator undulator sections. The superradiance of the ultrashort pulse is confirmed by detailed measurements of the resulting spectral structure, the intensity level of the produced harmonics, and the trend of the energy growth along the undulator. These results are compared to numerical particle simulations using the FEL code GENESIS 1.3 and show a satisfactory agreement. © 2013 American Physical Society.
Original languageEnglish
Article number044801
Pages (from-to)-
JournalPhysical Review Letters
Issue number4
Publication statusPublished - 23 Jan 2013
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Giannessi, L., Bellaveglia, M., Chiadroni, E., Cianchi, A., Couprie, M. E., Del Franco, M., Di Pirro, G., Ferrario, M., Gatti, G., Labat, M., Marcus, G., Mostacci, A., Petralia, A., Petrillo, V., Quattromini, M., Rau, J. V., Spampinati, S., & Surrenti, V. (2013). Superradiant cascade in a seeded free-electron laser. Physical Review Letters, 110(4), -. [044801].