High-gain harmonic-generation free-electron laser seeded by harmonics generated in gas |
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| Authors: | Labat M Bellaveglia M Bougeard M Carré B Ciocci F Chiadroni E Cianchi A Couprie M E Cultrera L Del Franco M Di Pirro G Drago A Ferrario M Filippetto D Frassetto F Gallo A Garzella D Gatti G Giannessi L Lambert G Mostacci A Petralia A Petrillo V Poletto L Quattromini M Rau J V Ronsivalle C Sabia E Serluca M Spassovsky I Surrenti V Vaccarezza C Vicario C |
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| Affiliation: | ENEA C.R. Frascati, Via E. Fermi, 45 00044 Frascati, Roma, Italy. |
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| 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. |
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