11. Status and perspectives of the FERMI FEL facility (2019)Luca Giannessi, Enrico Allaria, Laura Badano, S. Bassanese, Filippo Bencivenga, Carlo Callegari, Flavio Capotondi, Davide Castronovo, F. Cilento, Paolo Cinquegrana, Giovanni De Ninno, Primož Rebernik Ribič, 2019, published scientific conference contribution Keywords: free-electron lasers, harmonic generation
Published in RUNG: 15.01.2020; Views: 3930; Downloads: 96
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13. First lasing of a free electron laser in the soft x-ray spectral range with echo enabled harmonic generationEnrico Allaria, Alessandro Abrami, Laura Badano, Maurizio Bossi, Flavio Capotondi, Davide Castronovo, Marco Cautero, Paolo Cinquegrana, Ivan Cudin, M. B. Danailov, Primož Rebernik Ribič, Giovanni De Ninno, 2019, published scientific conference contribution Keywords: free-electron lasers, harmonic generation
Published in RUNG: 15.01.2020; Views: 4011; Downloads: 92
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15. Pulse duration of seeded free-electron lasersPaola Finetti, Hauke Höppner, Enrico Allaria, Carlo Callegari, Flavio Capotondi, Paolo Cinquegrana, Marcello Coreno, Riccardo Cucini, Miltcho Bojanov Danailov, Alexander Demidovich, Giovanni De Ninno, Primož Rebernik Ribič, 2017, original scientific article Keywords: free-electron lasers, harmonic generation, pulse duration
Published in RUNG: 14.01.2020; Views: 3996; Downloads: 14
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16. Generation and applications of extreme-ultraviolet vorticesCarlos Hernández-García, Jorge Vieira, Jose T. Mendonça, Laura Rego, Julio San Román, Luis Plaja, Primož Rebernik Ribič, David Gauthier, Antonio Picón, 2017, original scientific article Keywords: XUV/X-ray vortices, orbital angular momentum of photons, high-harmonic generation, free-electron lasers, plasma physics
Published in RUNG: 13.01.2020; Views: 4143; Downloads: 15
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17. Echo-enabled harmonic generation studies for the FERMI free-electron laserPrimož Rebernik Ribič, Eléonore Roussel, Gregory Penn, Giovanni De Ninno, Luca Giannessi, G. Penco, Enrico Allaria, 2017, original scientific article Keywords: free electron laser, harmonic up-conversion, high-harmonic generation, seeding, x-ray, pump-probe, microbunching instability
Published in RUNG: 13.01.2020; Views: 4026; Downloads: 14
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18. Tunable orbital angular momentum in high-harmonic generationDavid Gauthier, Primož Rebernik Ribič, Ganesh Adhikari, A Camper, C Chappuis, LF Dimauro, G Dovillaire, Fabio Frassetto, R Geneaux, Paolo Miotti, Luca Poletto, Barbara Ressel, C. Spezzani, Matija Stupar, T Ruchon, Giovanni De Ninno, 2017, original scientific article Keywords: Angular orbital momentum, High harmonic generation
Published in RUNG: 05.02.2018; Views: 5115; Downloads: 767
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19. Time- and angle-resolved photoemission spectroscopy with optimized high-harmonic pulses using frequency-doubled Ti:Sapphire lasersSteffen Eich, Jurij Urbančič, 2014, original scientific article Abstract: Time- and angle-resolved photoemission spectroscopy (trARPES) using femtosecond extreme ultraviolet high harmonics has recently emerged as a powerful tool for investigating ultrafast quasiparticle dynamics in correlated-electron materials. However, the full potential of this approach has not yet been achieved because, to date, high harmonics generated by 800 nm wavelength Ti:Sapphire lasers required a trade-off between photon flux, energy and time resolution. Photoemission spectroscopy requires a quasi-monochromatic output, but dispersive optical elements that select a single harmonic can significantly reduce the photon flux and time resolution. Here we show that 400 nm driven high harmonic extreme-ultraviolet trARPES is superior to using 800 nm laser drivers since it eliminates the need for any spectral selection, thereby increasing photon flux and energy resolution to <150 meV while preserving excellent time resolution of about 30 fs.
Keywords: angle-resolved photoemission spectroscopy, ARPES, high harmonic generation, ultrafast surface science
Published in RUNG: 20.04.2017; Views: 6329; Downloads: 0
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20. Self-amplified photo-induced gap quenching in a correlated electron materialMathias Stefan, Eich Steffen, Jurij Urbančič, 2016, original scientific article Abstract: Capturing the dynamic electronic band structure of a correlated material presents a powerful capability for uncovering the complex couplings between the electronic and structural degrees of freedom. When combined with ultrafast laser excitation, new phases of matter can result, since far-from-equilibrium excited states are instantaneously populated. Here, we elucidate a general relation between ultrafast non-equilibrium electron dynamics and the size of the characteristic energy gap in a correlated electron material. We show that carrier multiplication via impact ionization can be one of the most important processes in a gapped material, and that the speed of carrier multiplication critically depends on the size of the energy gap. In the case of the charge-density wave material 1T-TiSe 2 , our data indicate that carrier multiplication and gap dynamics mutually amplify each other, which explains—on a microscopic level—the extremely fast response of this material to ultrafast optical excitation.
Self-amplified photo-induced gap quenching in a correlated electron material. Available from: https://www.researchgate.net/publication/308804379_Self-amplified_photo-induced_gap_quenching_in_a_correlated_electron_material [accessed Apr 20, 2017].
Keywords: high harmonic generation, charge-density wave material, 1T-TiSe2, non-equilibrium electron dynamics, ultrafast surface science
Published in RUNG: 20.04.2017; Views: 6703; Downloads: 0
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