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.
High-order-harmonic generation and superradiance in a seeded free-electron laser / L. Giannessi, M. Artioli, M. Bellaveglia, F. Briquez, E. Chiadroni, A. Cianchi, M. E. Couprie, G. Dattoli, E. Di Palma, G. Di Pirro, M. Ferrario, D. Filippetto, F. Frassetto, G. Gatti, M. Labat, G. Marcus, A. Mostacci, A. Petralia, V. Petrillo, L. Poletto, M. Quattromini, J. V. Rau, J. Rosenzweig, E. Sabia, M. Serluca, I. Spassovsky, V. Surrenti. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 108:16(2012 Apr 09), pp. 164801.1-164801.5.
High-order-harmonic generation and superradiance in a seeded free-electron laser
V. Petrillo;
2012
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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