| Literature DB >> 22182029 |
M Labat1, M Bellaveglia, M Bougeard, B Carré, F Ciocci, E Chiadroni, A Cianchi, M E Couprie, L Cultrera, M Del Franco, G Di Pirro, A Drago, M Ferrario, D Filippetto, F Frassetto, A Gallo, D Garzella, G Gatti, L Giannessi, G Lambert, A Mostacci, A Petralia, V Petrillo, L Poletto, M Quattromini, J V Rau, C Ronsivalle, E Sabia, M Serluca, I Spassovsky, V Surrenti, C Vaccarezza, C Vicario.
Abstract
The injection of a seed in a free-electron laser (FEL) amplifier reduces the saturation length and improves the longitudinal coherence. A cascaded FEL, operating in the high-gain harmonic-generation regime, allows us to extend the beneficial effects of the seed to shorter wavelengths. We report on the first operation of a high-gain harmonic-generation free-electron laser, seeded with harmonics generated in gas. The third harmonics of a Ti:sapphire laser, generated in a gas cell, has been amplified and up-converted to its second harmonic (λ(rad)=133 nm) in a FEL cascaded configuration based on a variable number of modulators and radiators. We studied the transition between coherent harmonic generation and superradiant regime, optimizing the laser performances with respect to the number of modulators and radiators.Entities:
Year: 2011 PMID： 22182029 DOI： 10.1103/PhysRevLett.107.224801
Source DB: PubMed Journal: Phys Rev Lett ISSN： 0031-9007 Impact factor: 9.161