Journal
PHYSICAL REVIEW LETTERS
Volume 108, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.108.164801
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Funding
- Ministero dell'Istruzione, dell'Universita' e della Ricerca [DM1834 RIC.4-12-2002]
- EU [011935 EUROFEL]
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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 beta-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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