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 (lambda(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 super-radiant regime, optimizing the laser performances with respect to the number of modulators and radiators.
High-Gain Harmonic-Generation Free-Electron Laser Seeded by Harmonics Generated in Gas / M., Labat; M., Bellaveglia; M., Bougeard; B., Carre; 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; Mostacci, Andrea; 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. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 107:22(2011), pp. 224801-1-224801-5. [10.1103/physrevlett.107.224801]
High-Gain Harmonic-Generation Free-Electron Laser Seeded by Harmonics Generated in Gas
E. Chiadroni;MOSTACCI, Andrea;
2011
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 (lambda(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 super-radiant regime, optimizing the laser performances with respect to the number of modulators and radiators.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
