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High-order-harmonic generation and superradiance in a seeded free-electron laser |
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| Authors: | Giannessi L Artioli M Bellaveglia M Briquez F Chiadroni E Cianchi A Couprie M E Dattoli G Di Palma E Di Pirro G Ferrario M Filippetto D Frassetto F Gatti G Labat M Marcus G Mostacci A Petralia A Petrillo V Poletto L Quattromini M Rau J V Rosenzweig J Sabia E Serluca M Spassovsky I Surrenti V |
| Institution: | ENEA C.R. Frascati, Via E. Fermi, 45 00044 Frascati, Roma, Italy. Luca.Giannessi@enea.it |
| Abstract: | Higher order harmonic generation in a free-electron laser amplifier operating in the superradiant regime R. H. Dicke, Phys. Rev. 93, 99 (1954).] has been observed. Superradiance has been induced by seeding a single-pass amplifier with the second harmonic of a Ti:sapphire laser, generated in a β-Barium borate crystal, at seed intensities comparable to the free-electron laser saturation intensity. Pulse energy and spectral distributions of the harmonics up to the 11th order have been measured and compared with simulations. |
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