Free-electron lasers (FELs) are promising devices for generating light with laser-like properties in the extreme ultraviolet and X-ray spectral regions. Recently, FELs based on the self-amplified spontaneous emission (SASE) mechanism have allowed major breakthroughs in diffraction and spectroscopy applications, despite the relatively large shot-to-shot intensity and photon-energy fluctuations and the limited longitudinal coherence inherent in the SASE mechanism. Here, we report results on the initial performance of the FERMI seeded FEL, based on the high-gain harmonic generation configuration, in which an external laser is used to initiate the emission process. Emission from the FERMI FEL-1 source occurs in the form of pulses carrying energy of several tens of microjoules per pulse and tunable throughout the 65 to 20 nm wavelength range, with unprecedented shot-to-shot wavelength stability, low-intensity fluctuations, close to transform-limited bandwidth, transverse and longitudinal coherence and full control of polarization.
Highly coherent and stable pulses from the FERMI seeded free-electron laser in the extreme ultraviolet / E., Allaria; R., Appio; L., Badano; W. A., Barletta; S., Bassanese; S. G., Biedron; A., Borga; E., Busetto; D., Castronovo; P., Cinquegrana; S., Cleva; D., Cocco; M., Cornacchia; P., Craievich; I., Cudin; G., D'Auria; DAL FORNO, Massimo; M. B., Danailov; R., De Monte; G., De Ninno; P., Delgiusto; A., Demidovich; S., Di Mitri; B., Diviacco; A., Fabris; R., Fabris; W., Fawley; M., Ferianis; Ferrari, Eugenio; S., Ferry; L., Froehlich; P., Furlan; G., Gaio; F., Gelmetti; L., Giannessi; M., Giannini; R., Gobessi; R., Ivanov; E., Karantzoulis; M., Lonza; A., Lutman; B., Mahieu; M., Milloch; S. V., Milton; M., Musardo; I., Nikolov; Noe', Salvatore; Parmigiani, Fulvio; G., Penco; M., Petronio; L., Pivetta; M., Predonzani; F., Rossi; L., Rumiz; A., Salom; C., Scafuri; C., Serpico; P., Sigalotti; S., Spampinati; C., Spezzani; M., Svandrlik; C., Svetina; S., Tazzari; M., Trovo; R., Umer; A., Vascotto; M., Veronese; R., Visintini; M., Zaccaria; D., Zangrando; M., Zangrando. - In: NATURE PHOTONICS. - ISSN 1749-4885. - STAMPA. - (2012), pp. 699-704. [10.1038/NPHOTON.2012.233]
Highly coherent and stable pulses from the FERMI seeded free-electron laser in the extreme ultraviolet
DAL FORNO, MASSIMO;FERRARI, EUGENIO;NOE', SALVATORE;PARMIGIANI, FULVIO;
2012-01-01
Abstract
Free-electron lasers (FELs) are promising devices for generating light with laser-like properties in the extreme ultraviolet and X-ray spectral regions. Recently, FELs based on the self-amplified spontaneous emission (SASE) mechanism have allowed major breakthroughs in diffraction and spectroscopy applications, despite the relatively large shot-to-shot intensity and photon-energy fluctuations and the limited longitudinal coherence inherent in the SASE mechanism. Here, we report results on the initial performance of the FERMI seeded FEL, based on the high-gain harmonic generation configuration, in which an external laser is used to initiate the emission process. Emission from the FERMI FEL-1 source occurs in the form of pulses carrying energy of several tens of microjoules per pulse and tunable throughout the 65 to 20 nm wavelength range, with unprecedented shot-to-shot wavelength stability, low-intensity fluctuations, close to transform-limited bandwidth, transverse and longitudinal coherence and full control of polarization.Pubblicazioni consigliate
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