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177 results on '"Demidovich, Alexander"'

1. Circular Dichroism in Multiphoton Ionization of Resonantly Excited Helium Ions near Channel Closing

Author

Wagner, Rene, Ilchen, Markus, Douguet, Nicolas, Schmidt, Philipp, Wieland, Niclas, Callegari, Carlo, Delk, Zachary, Demidovich, Alexander, Di Fraia, Michele, Hofbrucker, Jiri, Manfredda, Michele, Music, Valerija, Plekan, Oksana, Prince, Kevin C., Rivas, Daniel E., Zangrando, Marco, Grum-Grzhimailo, Alexei N., Bartschat, Klaus, and Meyer, Michael

Subjects
Physics - Atomic Physics, Quantum Physics
Abstract

The circular dichroism (CD) of photoelectrons generated by near-infrared (NIR) laser pulses using multiphoton ionization of excited He$^+$ ions in the 3p(m=+1) state. The ions were prepared by circularly polarized extreme ultraviolet (XUV) pulses. For circularly polarized NIR pulses co- and counter-rotating relative to the polarization of the XUV pulse, a complex variation of the CD is observed as a result of intensity- and polarization-dependent Freeman resonances, with and without additional dichroic AC-Stark shifts. The experimental results are compared with numerical solutions of the time-dependent Schr\"odinger equation to identify and interpret the pronounced variation of the experimentally observed CD., Comment: 9 pages, 8 figures

Published
2024
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2. Strong-field quantum control in the extreme ultraviolet using pulse shaping

Author

Richter, Fabian, Saalmann, Ulf, Allaria, Enrico, Wollenhaupt, Matthias, Ardini, Benedetto, Brynes, Alexander, Callegari, Carlo, Cerullo, Giulio, Danailov, Miltcho, Demidovich, Alexander, Dulitz, Katrin, Feifel, Raimund, Di Fraia, Michele, Ganeshamandiram, Sarang Dev, Giannessi, Luca, Gölz, Nicolai, Hartweg, Sebastian, von Issendorff, Bernd, Laarmann, Tim, Landmesser, Friedemann, Li, Yilin, Manfredda, Michele, Manzoni, Cristian, Michelbach, Moritz, Morlok, Arne, Mudrich, Marcel, Ngai, Aaron, Nikolov, Ivaylo, Pal, Nitish, Pannek, Fabian, Penco, Giuseppe, Plekan, Oksana, Prince, Kevin C., Sansone, Giuseppe, Simoncig, Alberto, Stienkemeier, Frank, Squibb, Richard James, Susnjar, Peter, Trovo, Mauro, Uhl, Daniel, Wouterlood, Brendan, Zangrando, Marco, and Bruder, Lukas

Subjects
Physics - Atomic Physics
Abstract

Tailored light-matter interactions in the strong coupling regime enable the manipulation and control of quantum systems with up to unit efficiency, with applications ranging from quantum information to photochemistry. While strong light-matter interactions are readily induced at the valence electron level using long-wavelength radiation, comparable phenomena have been only recently observed with short wavelengths, accessing highly-excited multi-electron and inner-shell electron states. However, the quantum control of strong-field processes at short wavelengths has not been possible, so far, due to the lack of pulse shaping technologies in the extreme ultraviolet (XUV) and X-ray domain. Here, exploiting pulse shaping of the seeded free-electron laser (FEL) FERMI, we demonstrate the strong-field quantum control of ultrafast Rabi dynamics in helium atoms with high fidelity. Our approach unravels a strong dressing of the ionization continuum, otherwise elusive to experimental observables. The latter is exploited to achieve control of the total ionization rate, with prospective applications in many XUV and soft X-ray experiments. Leveraging recent advances in intense few-femtosecond to attosecond XUV to soft X-ray light sources, our results open an avenue to the efficient manipulation and selective control of core electron processes and electron correlation phenomena in real time.

Published
2024

3. Ultrafast electronic relaxation pathways of the molecular photoswitch quadricyclane

Author

Borne, Kurtis D., Cooper, Joseph C., Ashfold, Michael N. R., Bachmann, Julien, Bhattacharyya, Surjendu, Boll, Rebecca, Bonanomi, Matteo, Bosch, Michael, Callegari, Carlo, Centurion, Martin, Coreno, Marcello, Curchod, Basile F. E., Danailov, Miltcho B., Demidovich, Alexander, Di Fraia, Michele, Erk, Benjamin, Faccialà, Davide, Feifel, Raimund, Forbes, Ruaridh J. G., Hansen, Christopher S., Holland, David M. P., Ingle, Rebecca A., Lindh, Roland, Ma, Lingyu, McGhee, Henry G., Muvva, Sri Bhavya, Nunes, Joao Pedro Figueira, Odate, Asami, Pathak, Shashank, Plekan, Oksana, Prince, Kevin C., Rebernik, Primoz, Rouzée, Arnaud, Rudenko, Artem, Simoncig, Alberto, Squibb, Richard J., Venkatachalam, Anbu Selvam, Vozzi, Caterina, Weber, Peter M., Kirrander, Adam, and Rolles, Daniel

Published
2024
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4. Diffraction imaging of light induced dynamics in xenon-doped helium nanodroplets

Author

Langbehn, Bruno, Ovcharenko, Yevheniy, Clark, Andrew, Coreno, Marcello, Cucini, Riccardo, Demidovich, Alexander, Drabbels, Marcel, Finetti, Paola, Di Fraia, Michele, Giannessi, Luca, Grazioli, Cesare, Iablonskyi, Denys, LaForge, Aaron C., Nishiyama, Toshiyuki, de Lara, Verónica Oliver Álvarez, Peltz, Christian, Piseri, Paolo, Plekan, Oksana, Sander, Katharina, Ueda, Kiyoshi, Fennel, Thomas, Prince, Kevin C., Stienkemeier, Frank, Callegari, Carlo, Möller, Thomas, and Rupp, Daniela

Subjects
Physics - Atomic and Molecular Clusters, Physics - Optics
Abstract

We have explored the light induced dynamics in superfluid helium nanodroplets with wide-angle scattering in a pump-probe measurement scheme. The droplets are doped with xenon atoms to facilitate the ignition of a nanoplasma through irradiation with near-infrared laser pulses. After a variable time delay of up to 800 ps, we image the subsequent dynamics using intense extreme ultraviolet pulses from the FERMI free-electron laser. The recorded scattering images exhibit complex intensity fluctuations that are categorized based on their characteristic features. Systematic simulations of wide-angle diffraction patterns are performed, which can qualitatively explain the observed features by employing model shapes with both randomly distributed as well as structured, symmetric distortions. This points to a connection between the dynamics and the positions of the dopants in the droplets. In particular, the structured fluctuations might be governed by an underlying array of quantized vortices in the superfluid droplet as has been observed in previous small-angle diffraction experiments. Our results provide a basis for further investigations of dopant-droplet interactions and associated heating mechanisms., Comment: 24 pages, 8 figures, 1 table

Published
2022
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5. All-optical spin injection in silicon revealed by element specific time-resolved Kerr effect

Author

Laterza, Simone, Caretta, Antonio, Bhardwaj, Richa, Flammini, Roberto, Moras, Paolo, MatteoJugovac, Rajak, Piu, Islam, Mahabul, Ciancio, Regina, Bonanni, Valentina, Casarin, Barbara, Simoncig, Alberto, Zangrando, Marco, Ribic, Primoz Rebernik, Penco, Giuseppe, De Ninno, Giovanni, LucaGiannessi, Demidovich, Alexander, Danailov, Miltcho, Parmigiani, Fulvio, and Malvestuto, Marco

Subjects
Condensed Matter - Materials Science
Abstract

Understanding how a spin current flows across metal-semiconductor interfaces at pico- and femtosecond timescales has implications for ultrafast spintronics, data processing and storage applications. However, the possibility to directly access the propagation of spin currents on such time scales has been hampered by the simultaneous lack of both ultrafast element specific magnetic sensitive probes and tailored metal-semiconductor interfaces. Here, by means of free electron laser-based element sensitive Kerr spectroscopy, we report direct experimental evidence of spin currents across a Ni/Si interface in the form of different magnetodynamics at the Ni M2,3 and Si L2,3 absorption edges. This further allows us to calculate the propagation velocity of the spin current in silicon, which is on the order of 0.2 nm/fs.

Published
2021

6. Attosecond Pulse-shaping using a seeded free-electron laser

Author

Maroju, Praveen Kumar, Grazioli, Cesare, Di Fraia, Michele, Moioli, Matteo, Ertel, Dominik, Ahmadi, Hamed, Plekan, Oksana, Finetti, Paola, Allaria, Enrico, Giannessi, Luca, De Ninno, Giovanni, Spezzani, Carlo, Penco, Giuseppe, Demidovich, Alexander, Danailov, Miltcho, Borghes, Roberto, Kourousias, Georgios, Reis, Carlos Eduardo Sanches Dos, Billé, Fulvio, Lutman, Alberto A., Squibb, Richard J., Feifel, Raimund, Carpeggiani, Paolo, Reduzzi, Maurizio, Mazza, Tommaso, Meyer, Michael, Bengtsson, Samuel, Ibrakovic, Neven, Simpson, Emma Rose, Mauritsson, Johan, Csizmadia, Tamás, Dumergue, Mathieu, Kühn, Sergei, G., Harshitha N., You, Daehyun, Ueda, Kiyoshi, Labeye, Marie, Bækhøj, Jens Egebjerg, Schafer, Kenneth J., Gryzlova, Elena V., Grum-Grzhimailo, Alexei N., Prince, Kevin C., Callegari, Carlo, and Sansone, Giuseppe

Subjects
Physics - Optics, Physics - Atomic Physics
Abstract

Attosecond pulses are fundamental for the investigation of valence and core-electron dynamics on their natural timescale. At present the reproducible generation and characterisation of attosecond waveforms has been demonstrated only through the process of high-order harmonic generation. Several methods for the shaping of attosecond waveforms have been proposed, including metallic filters, multilayer mirrors and manipulation of the driving field. However, none of these approaches allow for the flexible manipulation of the temporal characteristics of the attosecond waveforms, and they suffer from the low conversion efficiency of the high-order harmonic generation process. Free Electron Lasers, on the contrary, deliver femtosecond, extreme ultraviolet and X-ray pulses with energies ranging from tens of $\mathrm{\mu}$J to a few mJ. Recent experiments have shown that they can generate sub-fs spikes, but with temporal characteristics that change shot-to-shot. Here we show the first demonstration of reproducible generation of high energy ($\mathrm{\mu}$J level) attosecond waveforms using a seeded Free Electron Laser. We demonstrate amplitude and phase manipulation of the harmonic components of an attosecond pulse train in combination with a novel approach for its temporal reconstruction. The results presented here open the way to perform attosecond time-resolved experiments with Free Electron Lasers.

Published
2020
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7. High-Gain Harmonic Generation with temporally overlapping seed pulses and application to ultrafast spectroscopy

Author

Wituschek, Andreas, Bruder, Lukas, Allaria, Enrico, Bangert, Ulrich, Binz, Marcel, Callegari, Carlo, Cinquegrana, Paolo, Danailov, Miltcho, Demidovich, Alexander, Di Fraia, Michele, Feifel, Raimund, Laarmann, Tim, Michiels, Rupert, Mudrich, Marcel, Nikolov, Ivaylo, Piseri, Paolo, Plekan, Oksana, Prince, Kevin Charles, Przystawik, Andreas, Ribič, Primož Rebernic, Sigalotti, Paolo, Stranges, Stefano, Uhl, Daniel, Giannessi, Luca, and Stienkemeier, Frank

Subjects
Physics - Atomic Physics, Physics - Optics
Abstract

Collinear double-pulse seeding of the High-Gain Harmonic Generation (HGHG) process in a free-electron laser (FEL) is a promising approach to facilitate various coherent nonlinear spectroscopy schemes in the extreme ultraviolet (XUV) spectral range. However, in collinear arrangements using a single nonlinear medium, temporally overlapping seed pulses may introduce nonlinear mixing signals that compromise the experiment at short time delays. Here, we investigate these effects in detail by extending the analysis described in a recent publication (Wituschek et al., Nat. Commun., 11, 883, 2020). High-order fringe-resolved autocorrelation and wave-packet interferometry experiments at photon energies > $23\,$eV are performed, accompanied by numerical simulations. It turns out that both the autocorrelation and the wave-packet interferometry data are very sensitive to saturation effects and can thus be used to characterize saturation in the HGHG process. Our results further imply that time-resolved spectroscopy experiments are feasible even for time delays smaller than the seed pulse duration., Comment: This is accepted version of the article. The Version of Record is available online at https://doi.org/10.1364/OE.401249

Published
2020
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8. Tracking the Ultraviolet Photochemistry of Thiophenone During and Beyond the Initial Ultrafast Ring Opening

Author

Pathak, Shashank, Ibele, Lea M., Boll, Rebecca, Callegari, Carlo, Demidovich, Alexander, Erk, Benjamin, Feifel, Raimund, Forbes, Ruaridh, Di Fraia, Michele, Giannessi, Luca, Hansen, Christopher S., Holland, David M. P., Ingle, Rebecca A., Mason, Robert, Plekan, Oksana, Prince, Kevin C., Rouzée, Arnaud, Squibb, Richard J., Tross, Jan, Ashfold, Michael N. R., Curchod, Basile F. E., and Rolles, Daniel

Subjects
Physics - Chemical Physics
Abstract

Photoinduced isomerization reactions, including ring-opening reactions, lie at the heart of many processes in nature. The mechanisms of such reactions are determined by a delicate interplay of coupled electronic and nuclear dynamics unfolding on the femtosecond scale, followed by the slower redistribution of energy into different vibrational degrees of freedom. Here we apply time-resolved photoelectron spectroscopy with a seeded extreme ultraviolet free electron laser to trace the ultrafast ring opening of gas phase thiophenone molecules following photoexcitation at 265 nm. When combined with cutting edge ab initio electronic structure and molecular dynamics calculations of both the excited and ground state molecules, the results provide unprecedented insights into both electronic and nuclear dynamics of this fundamental class of reactions. The initial ring opening and non-adiabatic coupling to the electronic ground state is shown to be driven by ballistic SC bond extension and to be complete within 350 femtoseconds. Theory and experiment also allow clear visualization of the rich ground-state dynamics involving formation of, and interconversion between, several ring opened isomers and the reformed cyclic structure, and fragmentation (CO loss) over much longer timescales., Comment: 40 pages, 21 figures Changes from the previous version: 1) Added theoretical calculations for explaining long timescale changes in shown in Figure 4(a). 2) Reworked on fitting (modelling) of the experimental data in Figure 2(b). Added another panel i.e. Figure 2(c). 3) Other minor changes and rewording in response to questions and suggestions by the referees

Published
2019

9. Attosecond coherent control of electronic wave packets in two-colour photoionization using a novel timing tool for seeded free-electron laser

Author

Maroju, Praveen Kumar, Di Fraia, Michele, Plekan, Oksana, Bonanomi, Matteo, Merzuk, Barbara, Busto, David, Makos, Ioannis, Schmoll, Marvin, Shah, Ronak, Ribič, Primož Rebernik, Giannessi, Luca, De Ninno, Giovanni, Spezzani, Carlo, Penco, Giuseppe, Demidovich, Alexander, Danailov, Miltcho, Coreno, Marcello, Zangrando, Marco, Simoncig, Alberto, Manfredda, Michele, Squibb, Richard J., Feifel, Raimund, Bengtsson, Samuel, Simpson, Emma Rose, Csizmadia, Tamás, Dumergue, Mathieu, Kühn, Sergei, Ueda, Kiyoshi, Li, Jianxiong, Schafer, Kenneth J., Frassetto, Fabio, Poletto, Luca, Prince, Kevin C., Mauritsson, Johan, Callegari, Carlo, and Sansone, Giuseppe

Published
2023
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10. Tracking Attosecond Electronic Coherences Using Phase-Manipulated Extreme Ultraviolet Pulses

Author

Wituschek, Andreas, Bruder, Lukas, Allaria, Enrico, Bangert, Ulrich, Binz, Marcel, Callegari, Carlo, Cerullo, Giulio, Cinquegrana, Paolo, Gianessi, Luca, Danailov, Miltcho, Demidovich, Alexander, Di Fraia, Michele, Drabbels, Marcel, Feifel, Raimund, Laarmann, Tim, Michiels, Rupert, Mirian, Najmeh Sadat, Mudrich, Marcel, Nikolov, Ivaylo, O'Shea, Finn H., Penco, Giuseppe, Piseri, Paolo, Plekan, Oksana, Prince, Kevin Charles, Przystawik, Andreas, Ribič, Primož Rebernik, Sansone, Giuseppe, Sigalotti, Paolo, Spampinati, Simone, Spezzani, Carlo, Squibb, Richard James, Stranges, Stefano, Uhl, Daniel, and Stienkemeier, Frank

Subjects
Physics - Atomic Physics, Physics - Atomic and Molecular Clusters, Physics - Optics, Quantum Physics
Abstract

The recent development of ultrafast extreme ultraviolet (XUV) coherent light sources bears great potential for a better understanding of the structure and dynamics of matter. Promising routes are advanced coherent control and nonlinear spectroscopy schemes in the XUV energy range, yielding unprecedented spatial and temporal resolution. However, their implementation has been hampered by the experimental challenge of generating XUV pulse sequences with precisely controlled timing and phase properties. In particular, direct control and manipulation of the phase of individual pulses within a XUV pulse sequence opens exciting possibilities for coherent control and multidimensional spectroscopy, but has not been accomplished. Here, we overcome these constraints in a highly time-stabilized and phase-modulated XUV-pump, XUV-probe experiment, which directly probes the evolution and dephasing of an inner subshell electronic coherence. This approach, avoiding any XUV optics for direct pulse manipulation, opens up extensive applications of advanced nonlinear optics and spectroscopy at XUV wavelengths., Comment: This is the accepted version of the article. The Version of Record is available online at 10.1038/s41467-020-14721-2

Published
2019
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12. Impulsive laser-induced alignment of OCS molecules at FERMI

Author

Di Fraia, Michele, Finetti, Paola, Richter, Robert, Prince, Kevin C., Wiese, Joss, Devetta, Michele, Negro, Matteo, Vozzi, Caterina, Ciriolo, Anna G., Pusala, Aditya, Demidovich, Alexander, Danailov, Miltcho B., Karamatskos, Evangelos T., Trippel, Sebastian, Küpper, Jochen, and Callegari, Carlo

Subjects
Physics - Chemical Physics, Physics - Atomic and Molecular Clusters
Abstract

We demonstrate the experimental realization of impulsive alignment of carbonyl sulfide (OCS) molecules at the Low Density Matter Beamline (LDM) at the free-electron laser FERMI. OCS molecules in a molecular beam were impulsively aligned using 200 fs pulses from a near-infrared laser. The alignment was probed through time-delayed ionization above the sulphur 2p edge, resulting in multiple ionization via Auger decay and subsequent Coulomb explosion of the molecules. The ionic fragments were collected using a time-of-flight mass spectrometer and the analysis of ion-ion covariance maps confirmed the correlation between fragments after Coulomb explosion. The analysis of the CO+ and S+ channels allowed us to extract the rotational dynamics, which is in agreement with our theoretical description as well as with previous experiments. This result opens the way for a new class of experiments at LDM within the field of coherent control of molecules with the possibilities that a precisely synchronized optical-pump XUV-probe laser setup like FERMI can offer., Comment: 7 pages, 6 figures

Published
2018
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13. Coherent soft X-ray pulses from an echo-enabled harmonic generation free-electron laser

Author

Rebernik Ribič, Primož, Abrami, Alessandro, Badano, Laura, Bossi, Maurizio, Braun, Hans-Heinrich, Bruchon, Niky, Capotondi, Flavio, Castronovo, Davide, Cautero, Marco, Cinquegrana, Paolo, Coreno, Marcello, Couprie, Marie Emmanuelle, Cudin, Ivan, Boyanov Danailov, Miltcho, De Ninno, Giovanni, Demidovich, Alexander, Di Mitri, Simone, Diviacco, Bruno, Fawley, William M, Feng, Chao, Ferianis, Mario, Ferrari, Eugenio, Foglia, Laura, Frassetto, Fabio, Gaio, Giulio, Garzella, David, Ghaith, Amin, Giacuzzo, Fabio, Giannessi, Luca, Grattoni, Vanessa, Grulja, Sandi, Hemsing, Erik, Iazzourene, Fatma, Kurdi, Gabor, Lonza, Marco, Mahne, Nicola, Malvestuto, Marco, Manfredda, Michele, Masciovecchio, Claudio, Miotti, Paolo, Mirian, Najmeh S, Petrov Nikolov, Ivaylo, Penco, Giuseppe Maria, Penn, Gregory, Poletto, Luca, Pop, Mihai, Prat, Eduard, Principi, Emiliano, Raimondi, Lorenzo, Reiche, Sven, Roussel, Eléonore, Sauro, Roberto, Scafuri, Claudio, Sigalotti, Paolo, Spampinati, Simone, Spezzani, Carlo, Sturari, Luca, Svandrlik, Michele, Tanikawa, Takanori, Trovó, Mauro, Veronese, Marco, Vivoda, Davide, Xiang, Dao, Zaccaria, Maurizio, Zangrando, Dino, Zangrando, Marco, and Allaria, Enrico Massimiliano

Subjects
Atomic, Molecular and Optical Physics, Physical Sciences, Mathematical Sciences, Optoelectronics & Photonics, Mathematical sciences, Physical sciences
Abstract

X-ray free-electron lasers (FELs), which amplify light emitted by a relativistic electron beam, are extending nonlinear optical techniques to shorter wavelengths, adding element specificity by exciting and probing electronic transitions from core levels. These techniques would benefit tremendously from having a stable FEL source, generating spectrally pure and wavelength-tunable pulses. We show that such requirements can be met by operating the FEL in the so-called echo-enabled harmonic generation (EEHG) configuration. Here, two external conventional lasers are used to precisely tailor the longitudinal phase space of the electron beam before emission of X-rays. We demonstrate high-gain EEHG lasing producing stable, intense, nearly fully coherent pulses at wavelengths as short as 5.9 nm (~211 eV) at the FERMI FEL user facility. Low sensitivity to electron-beam imperfections and observation of stable, narrow-band, coherent emission down to 2.6 nm (~474 eV) make the technique a prime candidate for generating laser-like pulses in the X-ray spectral region, opening the door to multidimensional coherent spectroscopies at short wavelengths.

Published
2019

15. Wave packet dynamics and control in excited states of molecular nitrogen

Author

Fushitani, Mizuho, primary, Fujise, Hikaru, additional, Hishikawa, Akiyoshi, additional, You, Daehyun, additional, Saito, Shu, additional, Luo, Yu, additional, Ueda, Kiyoshi, additional, Ibrahim, Heide, additional, Légaré, Francois, additional, Pratt, Stephen T., additional, Eng-Johnsson, Per, additional, Mauritsson, Johan, additional, Olofsson, Anna, additional, Peschel, Jasper, additional, Simpson, Emma R., additional, Carpeggiani, Paolo Antonio, additional, Ertel, Dominik, additional, Maroju, Praveen Kumar, additional, Moioli, Matteo, additional, Sansone, Giuseppe, additional, Shah, Ronak, additional, Csizmadia, Tamás, additional, Dumergue, Mathieu, additional, Nandiga Gopalakrishna, Harshitha, additional, Kühn, Sergei, additional, Callegari, Carlo, additional, Danailov, Miltcho, additional, Demidovich, Alexander, additional, Raimondi, Lorenzo, additional, Zangrando, Marco, additional, De Ninno, Giovanni, additional, Di Fraia, Michele, additional, Giannessi, Luca, additional, Plekan, Oksana, additional, Rebernik Ribic, Primoz, additional, and Prince, Kevin C., additional

Published
2024
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16. Generation and measurement of intense few-femtosecond superradiant extreme-ultraviolet free-electron laser pulses

Author

Mirian, Najmeh S., Di Fraia, Michele, Spampinati, Simone, Sottocorona, Filippo, Allaria, Enrico, Badano, Laura, Danailov, Miltcho B., Demidovich, Alexander, De Ninno, Giovanni, Di Mitri, Simone, Penco, Giuseppe, Rebernik Ribič, Primož, Spezzani, Carlo, Gaio, Giulio, Trovó, Mauro, Mahne, Nicola, Manfredda, Michele, Raimondi, Lorenzo, Zangrando, Marco, Plekan, Oksana, Prince, Kevin C., Mazza, Tommaso, Squibb, Richard J., Callegari, Carlo, Yang, Xi, and Giannessi, Luca

Published
2021
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17. Spectro-temporal shaping of seeded free-electron laser pulses

Author

Gauthier, David, Ribič, Primož Rebernik, De Ninno, Giovanni, Allaria, Enrico, Cinquegrana, Paolo, Danailov, Miltcho Boyanov, Demidovich, Alexander, Ferrari, Eugenio, Giannessi, Luca, Mahieu, Benoît, and Penco, Giuseppe

Subjects
Physics - Optics
Abstract

We demonstrate the ability to control and shape the spectro-temporal content of extreme-ultraviolet (XUV) pulses produced by a seeded free-electron laser (FEL). The control over the spectro-temporal properties of XUV light was achieved by precisely manipulating the linear frequency chirp of the seed laser. Our results agree with existing theory, which allows retrieving the temporal properties (amplitude and phase) of the FEL pulse from measurements of the spectra as a function of the FEL operating parameters. Furthermore, we show the first direct evidence of the full temporal coherence of FEL light and generate Fourier limited pulses by fine-tuning the FEL temporal phase. The possibility to tailor the spectro-temporal content of intense short-wavelength pulses represents the first step towards efficient nonlinear optics in the XUV to X-ray spectral region and will enable precise manipulation of core-electron excitations using the methods of coherent quantum control., Comment: 5 pages, 3 figures

Published
2015
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18. Generation of interferometrically stable pulse pairs from a free-electron laser using a birefringent interferometer

Author

Ardini, Benedetto, primary, Richter, Fabian, additional, Uboldi, Lorenzo, additional, Cinquegrana, Paolo, additional, Danailov, Miltcho, additional, Demidovich, Alexander, additional, Ganeshamandiram, Sarang Dev, additional, Hartweg, Sebastian, additional, Kurdi, Gabor, additional, Landmesser, Friedemann, additional, Michelbach, Moritz, additional, Ngai, Aaron, additional, Nikolov, Ivaylo, additional, Rendler, Nicolas, additional, Stienkemeier, Frank, additional, Uhl, Daniel, additional, Bruder, Lukas, additional, Cerullo, Giulio, additional, and Manzoni, Cristian, additional

Published
2024
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19. Photoelectric effect with a twist

Author

De Ninno, Giovanni, Wätzel, Jonas, Ribič, Primož Rebernik, Allaria, Enrico, Coreno, Marcello, Danailov, Miltcho B., David, Christian, Demidovich, Alexander, Di Fraia, Michele, Giannessi, Luca, Hansen, Klavs, Krušič, Špela, Manfredda, Michele, Meyer, Michael, Mihelič, Andrej, Mirian, Najmeh, Plekan, Oksana, Ressel, Barbara, Rösner, Benedikt, Simoncig, Alberto, Spampinati, Simone, Stupar, Matija, Žitnik, Matjaž, Zangrando, Marco, Callegari, Carlo, and Berakdar, Jamal

Published
2020
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20. Tracking the ultraviolet-induced photochemistry of thiophenone during and after ultrafast ring opening

Author

Pathak, Shashank, Ibele, Lea M., Boll, Rebecca, Callegari, Carlo, Demidovich, Alexander, Erk, Benjamin, Feifel, Raimund, Forbes, Ruaridh, Di Fraia, Michele, Giannessi, Luca, Hansen, Christopher S., Holland, David M. P., Ingle, Rebecca A., Mason, Robert, Plekan, Oksana, Prince, Kevin C., Rouzée, Arnaud, Squibb, Richard J., Tross, Jan, Ashfold, Michael N. R., Curchod, Basile F. E., and Rolles, Daniel

Published
2020
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22. Tracking attosecond electronic coherences using phase-manipulated extreme ultraviolet pulses

Author

Wituschek, Andreas, Bruder, Lukas, Allaria, Enrico, Bangert, Ulrich, Binz, Marcel, Borghes, Roberto, Callegari, Carlo, Cerullo, Giulio, Cinquegrana, Paolo, Giannessi, Luca, Danailov, Miltcho, Demidovich, Alexander, Di Fraia, Michele, Drabbels, Marcel, Feifel, Raimund, Laarmann, Tim, Michiels, Rupert, Mirian, Najmeh Sadat, Mudrich, Marcel, Nikolov, Ivaylo, O’Shea, Finn H., Penco, Giuseppe, Piseri, Paolo, Plekan, Oksana, Prince, Kevin Charles, Przystawik, Andreas, Ribič, Primož Rebernik, Sansone, Giuseppe, Sigalotti, Paolo, Spampinati, Simone, Spezzani, Carlo, Squibb, Richard James, Stranges, Stefano, Uhl, Daniel, and Stienkemeier, Frank

Published
2020
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23. Chirped Pulse Amplification in a Seeded FEL: Towards the Generation of High-Power Few-Femtosecond Pulses Below 10 nm

Author

Giannessi,Luca, Allaria,Enrico, Garzella,David, Diviacco,Bruno, Poletto,Luca, Sottocorona,Filippo, Frassetto,Fabio, Di Mitri,Simone, Callegari,Carlo, Demidovich,Alexander, De Ninno,Giovanni, Cudin,Ivan, Rebernik Ribic,Primoz, Simoncig,Alberto, Zangrando,Marco, Zeitoun,Philippe, Penco,Giuseppe, Cinquegrana,Paolo, Trovo,Mauro, Coreno,Marcello, Danailov,Miltcho, Brynes,Alexander, Perosa,Giovanni, Sturari,Luca, and Novinec,Luka

Subjects
seeded-fel - Seeded FEL, Accelerator Physics
Abstract

In optical conventional lasers, chirped pulse amplification (CPA) has become an extremely powerful technique for the generation of ultrashort pulses in the infrared and visible spectral ranges. In this contribution we report the successful implementation of CPA in a seeded XUV FEL. A second experiment, using a two-stage harmonic generation scheme (FERMI FEL-2) has the objective to generate coherent and phase-tailored few-femtosecond FEL pulses, with gigawatt peak power in the sub-10 nm spectral range. This second experiment is still in progress. We will discuss the main scientific and technical bottlenecks and the implications.

Published
2023
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24. Non-linear Harmonics of a Seeded FEL at the Water Window and Beyond

Author

Nikolov,Ivaylo, Manfredda,Michele, Stefano,Pelli Cresi, Masciovecchio,Claudio, Perosa,Giovanni, Pedersoli,Emanuele, Bencivenga,Filippo, Allaria,Enrico, Roesner,Benedikt, Dal Zilio,Simone, Vodungbo,Boris, Malvestuto,Marco, Luning,Jan, Giannessi,Luca, Hennes,Marcel, Sottocorona,Filippo, Kurdi,Gabor, Di Mitri,Simone, Spezzani,Carlo, Callegari,Carlo, Roussel,Eléonore, Capotondi,Flavio, Mincigrucci,Riccardo, Demidovich,Alexander, Sacchi,Maurizio, De Ninno,Giovanni, Rebernik Ribic,Primoz, Badano,Laura, Simoncig,Alberto, Zangrando,Marco, David,Christian, Bougiatioti,Panagiota, Penco,Giuseppe, Jal,Emmanuelle, Cinquegrana,Paolo, Spampinati,Simone, Trovo,Mauro, Foglia,Laura, Gaio,Giulio, Caretta,Antonio, Principi,Emiliano, Danailov,Miltcho, Brynes,Alexander, Chardonnet,Valentin, Gessini,Alessandro, and De Angelis,Dario

Subjects
seeded-fel - Seeded FEL, Accelerator Physics
Abstract

The advent of free electron lasers (FELs) in the soft and hard X-ray spectral region has opened the possibility to probe electronic, magnetic and structural dynamics, in both diluted and condensed matter samples, with femtosecond time resolution. In particular, FELs strongly enhanced the capabilities of several analytical techniques, which took advantage of the high degree of transverse coherence provided. FELs based on the harmonic up-conversion of an external seed laser are characterised also by a high degree of longitudinal coherence, since electrons inherit the coherence properties of the seed. At the present state of the art, the shortest wavelength delivered to user experiments by an externally seeded FEL light source is about 4 nm. We show here that pulses with a high longitudinal degree of coherence (first and second order) covering the water window and with photon energy extending up to 790 eV can be generated by exploiting the so-called nonlinear harmonic regime, which allows generation of radiation at harmonics of the resonant FEL wavelength. Moreover, we report the results of two proof-of-principle experiments: one measuring the oxygen K-edge absorption in water ($\sim$ 530 eV), the other analysing the spin dynamics of Fe and Co through magnetic small angle x-ray scattering at their L-edges (707 eV and 780 eV)

Published
2023
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25. Future Upgrade Strategy of the FERMI Seeded FEL Facility

Author

Lonza,Marco, Nikolov,Ivaylo, Manfredda,Michele, Prince,Kevin, Masciovecchio,Claudio, Tanaka,Takashi, Giannessi,Luca, Ferianis,Mario, Bencivenga,Filippo, Allaria,Enrico, Shafqat,Nuaman, Scafuri,Claudio, Malvestuto,Marco, Diviacco,Bruno, Sigalotti,Paolo, Gelmetti,Federico, Delgiusto,Paolo, Sottocorona,Filippo, Fawley,William, Di Mitri,Simone, Kurdi,Gabor, Capotondi,Flavio, Callegari,Carlo, Spezzani,Carlo, Demidovich,Alexander, De Ninno,Giovanni, Rebernik Ribic,Primoz, Badano,Laura, Simoncig,Alberto, Castronovo,Davide, Zangrando,Marco, Penn,Gregory, Penco,Giuseppe, Visintini,Roberto, Cinquegrana,Paolo, Veronese,Marco, Spampinati,Simone, Trovo,Mauro, Coreno,Marcello, Gaio,Giulio, Principi,Emiliano, Danailov,Miltcho, Perosa,Giovanni, and Sturari,Luca

Subjects
seeded-fel - Seeded FEL, Accelerator Physics
Abstract

FERMI is implementing a development plan to keep the facility in a world-leading position on the base of the requests coming from the user community and the advises from the Scientific Advisory Council and the Machine Advisory Committee. The ultimate goal of this plan consists in doubling the maximum photon energy available and in reducing the pulse duration below the characteristic lifetime of the atomic core levels in the source spectral range. An upgrade of FERMI aimed at reaching the oxygen K-edge requires a profound modification of the FEL configurations and of the main components of the machine, including the linac and the undulator lines. One of the most promising approaches for this upgrade is to implement the echo-enabled harmonic generation (EEHG) scheme, relying on two external lasers to precisely control the spectrotemporal properties of the FEL pulse. The conversion to EEHG of the first stage of the double-stage harmonic cascade presently in use on FEL-2, would allow to reach harmonics as high as 120, enabling to generate coherent pulses down to 2 nm. The main aspects of the upgrade strategy will be discussed in this contribution.

Published
2023
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26. All-optical spin injection in silicon investigated by element-specific time-resolved Kerr effect

Author

Laterza, Simone, primary, Caretta, Antonio, additional, Bhardwaj, Richa, additional, Flammini, Roberto, additional, Moras, Paolo, additional, Jugovac, Matteo, additional, Rajak, Piu, additional, Islam, Mahabul, additional, Ciancio, Regina, additional, Bonanni, Valentina, additional, Casarin, Barbara, additional, Simoncig, Alberto, additional, Zangrando, Marco, additional, Ribič, Primož Rebernik, additional, Penco, Giuseppe, additional, De Ninno, Giovanni, additional, Giannessi, Luca, additional, Demidovich, Alexander, additional, Danailov, Miltcho, additional, Parmigiani, Fulvio, additional, and Malvestuto, Marco, additional

Published
2022
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27. All-optical spin injection in silicon investigated by element-specific time-resolved Kerr effect

Author

Laterza, Simone, Caretta, Antonio, Bhardwaj, Richa, Lammini, Roberto F., Moras, Paolo, Jugovac, Matteo, Rajak, Piu, Islam, Mahabul, Ciancio, Regina, Bonanni, Valentina, Casarin, Barbara, Simoncig, Alberto, Zangrando, Marco, Ribic, Primoz Rebernik, Penco, Giuseppe, De Ninno, Giovanni, Giannessi, Luca, Demidovich, Alexander, Danailov, Miltcho, Parmigiani, Fulvio, Malvestuto, Marco, Laterza, Simone, Caretta, Antonio, Bhardwaj, Richa, Lammini, Roberto F., Moras, Paolo, Jugovac, Matteo, Rajak, Piu, Islam, Mahabul, Ciancio, Regina, Bonanni, Valentina, Casarin, Barbara, Simoncig, Alberto, Zangrando, Marco, Ribic, Primoz Rebernik, Penco, Giuseppe, De Ninno, Giovanni, Giannessi, Luca, Demidovich, Alexander, Danailov, Miltcho, Parmigiani, Fulvio, and Malvestuto, Marco

Abstract

Understanding howa spin current flows across metal-semiconductor interfaces at pico- and femtosecond time scales is of paramount importance for ultrafast spintronics, data processing, and storage applications. However, the possibility to directly access the propagation of spin currents, within such time scales, has been hampered by the simultaneous lack of both ultrafast element-specific magnetic sensitive probes and tailoredwell-built and characterized metal-semiconductor interfaces. Here, by means of a novel free-electron laser-based element-sensitive ultrafast time-resolved Kerr spectroscopy, we reveal different magnetodynamics for the Ni M-2;3 and Si L-2;3 absorption edges. These results are assumed to be the experimental evidence of photoinduced spin currents propagating at a speed of similar to 0.2 nm/fs across the Ni/Si interface.

Published
2022

28. Light-Induced Magnetization at the Nanoscale

Author

Wätzel, Jonas, primary, Rebernik Ribič, Primož, additional, Coreno, Marcello, additional, Danailov, Miltcho B., additional, David, Christian, additional, Demidovich, Alexander, additional, Di Fraia, Michele, additional, Giannessi, Luca, additional, Hansen, Klavs, additional, Krušič, Špela, additional, Manfredda, Michele, additional, Meyer, Michael, additional, Mihelič, Andrej, additional, Mirian, Najmeh, additional, Plekan, Oksana, additional, Ressel, Barbara, additional, Rösner, Benedikt, additional, Simoncig, Alberto, additional, Spampinati, Simone, additional, Stupar, Matija, additional, Žitnik, Matjaž, additional, Zangrando, Marco, additional, Callegari, Carlo, additional, Berakdar, Jamal, additional, and De Ninno, Giovanni, additional

Published
2022
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29. FERMI FEL-1 Upgrade to EEHG

Author

Spezzani, Carlo, Allaria, Enrico, Badano, Laura, Castronovo, Davide, Cinquegrana, Paolo, Danailov, Miltcho, De Monte, Raffaele, De Ninno, Giovanni, Delgiusto, Paolo, Demidovich, Alexander, Di Mitri, Simone, Diviacco, Bruno, Ferianis, Mario, Gaio, Giulio, Gelmetti, Federico, Giannessi, Luca, Kurdi, Gabor, Lonza, Marco, Masciovecchio, Claudio, Nikolov, Ivaylo, Penco, Giuseppe, Perosa, Giovanni, Rebernik Ribič, Primoz, Scafuri, Claudio, Shafqat, Nuaman, Sigalotti, Paolo, Sottocorona, Filippo, Spampinati, Simone, Sturari, Luca, Trovò, Mauro, Veronese, Marco, and Visintini, Roberto

Subjects
MC2: Photon Sources and Electron Accelerators, Accelerator Physics
Abstract

The Fermi free-electron laser (FEL) facility is operating since 2010 providing the user community with ultrashort pulses in the VUV- XUV range. Using the High Gain Harmonic Generation (HGHG) setup, nearly transform-limited pulses with gigawatt peak power are made available. Furthermore, several multicolor and coherent control schemes are possible and highly required from the user community. To meet the request of extending the spectral range over the whole water window, an upgrade strategy of the FERMI facility has recently initiated. During the first phase of the upgrade, the single cascade FEL-1 will be adapted to operate either in Echo Enabled Harmonic Generation (EEHG) or in HGHG. Required modifications can be achieved with limited impact on FERMI operations and will improve FEL-1’s spectral range, spectral quality and flexibility. The second phase includes modification of the FEL-2 setup and will benefit from the experience gained with phase 1. The two phases will proceed in parallel to the linac upgrade aiming at extending the beam energy to 1.8 GeV. We report here details on the upgrade of the FEL-1 foreseen to provide light to users in the new configuration by spring 2023., Proceedings of the 13th International Particle Accelerator Conference, IPAC2022, Bangkok, Thailand

Published
2022
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30. Fermi 2.0 Future Upgrade Strategy

Author

Giannessi, Luca, Allaria, Enrico, Badano, Laura, Bencivenga, Filippo, Callegari, Carlo, Capotondi, Flavio, Castronovo, Davide, Cinquegrana, Paolo, Coreno, Marcello, Danailov, Miltcho, De Ninno, Giovanni, Delgiusto, Paolo, Demidovich, Alexander, Di Mitri, Simone, Diviacco, Bruno, Fawley, William, Ferianis, Mario, Gaio, Giulio, Gelmetti, Federico, Kurdi, Gabor, Lonza, Marco, Malvestuto, Marco, Manfredda, Michele, Masciovecchio, Claudio, Nikolov, Ivaylo, Penco, Giuseppe, Penn, Gregory, Perosa, Giovanni, Prince, Kevin, Principi, Emiliano, Rebernik Ribič, Primoz, Scafuri, Claudio, Shafqat, Nuaman, Sigalotti, Paolo, Simoncig, Alberto, Sottocorona, Filippo, Spampinati, Simone, Spezzani, Carlo, Sturari, Luca, Tanaka, Takashi, Trovò, Mauro, Veronese, Marco, Visintini, Roberto, and Zangrando, Marco

Subjects
MC2: Photon Sources and Electron Accelerators, Accelerator Physics
Abstract

FERMI is studying a series of developments to keep the facility in a world-leading position on the base of the requests coming from the user community, the Scientific Advisory Council and the Machine Advisory Committee. The ultimate goal of the development plan consists in doubling the photon energy range and reducing the pulse duration below the characteristic lifetime of the atomic core levels located in the energy range of the source. One of the most promising approaches is the echo-enabled harmonic generation (EEHG) scheme, relying on two external lasers to precisely control the spectro-temporal properties of the FEL pulse. The implementation of EEHG in the double-stage harmonic cascade presently in use on FEL-2, would allow harmonics as high as 120 enabling to generate coherent pulses down to 2 nm starting from UV lasers. An upgrade of FERMI aimed at reaching the oxygen K-edge requires a profound modification of the FEL configurations and of the main components of the machine, including the linac and the undulator lines. The main aspects of the upgrade strategy will be discussed in this presentation., Proceedings of the 13th International Particle Accelerator Conference, IPAC2022, Bangkok, Thailand

Published
2022
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31. A novel free-electron laser single-pulse Wollaston polarimeter for magneto-dynamical studies

Author

Caretta, Antonio, Laterza, Simone, Bonanni, Valentina, Sergo, Rudi, Dri, Carlo, Cautero, Giuseppe, Galassi, Fabio, Zamolo, Matteo, Simoncig, Alberto, Zangrando, Marco, Gessini, Alessandro, Dal Zilio, Simone, Flammini, Roberto, Moras, Paolo, Demidovich, Alexander, Danailov, Miltcho, Parmigiani, Fulvio, Malvestuto, Marco, Caretta, Antonio, Laterza, Simone, Bonanni, Valentina, Sergo, Rudi, Dri, Carlo, Cautero, Giuseppe, Galassi, Fabio, Zamolo, Matteo, Simoncig, Alberto, Zangrando, Marco, Gessini, Alessandro, Dal Zilio, Simone, Flammini, Roberto, Moras, Paolo, Demidovich, Alexander, Danailov, Miltcho, Parmigiani, Fulvio, and Malvestuto, Marco

Abstract

Here, we report on the conceptual design, the hardware realization, and the first experimental results of a novel and compact x-ray polarimeter capable of a single-pulse linear polarization angle detection in the extreme ultraviolet photon energy range. The polarimeter is tested by performing time resolved pump-probe experiments on a Ni80Fe20 Permalloy film at the M-2,M-3 Ni edge at an externally seeded free-electron laser source. Comparison with similar experiments reported in the literature shows the advantages of our approach also in view of future experiments.

Published
2021

32. A novel free-electron laser single-pulse Wollaston polarimeter for magneto-dynamical studies

Author

Caretta, Antonio, primary, Laterza, Simone, additional, Bonanni, Valentina, additional, Sergo, Rudi, additional, Dri, Carlo, additional, Cautero, Giuseppe, additional, Galassi, Fabio, additional, Zamolo, Matteo, additional, Simoncig, Alberto, additional, Zangrando, Marco, additional, Gessini, Alessandro, additional, Zilio, Simone Dal, additional, Flammini, Roberto, additional, Moras, Paolo, additional, Demidovich, Alexander, additional, Danailov, Miltcho, additional, Parmigiani, Fulvio, additional, and Malvestuto, Marco, additional

Published
2021
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33. Time-resolved photoelectron imaging of complex resonances in molecular nitrogen

Author

Fushitani, Mizuho, primary, Pratt, Stephen T., additional, You, Daehyun, additional, Saito, Shu, additional, Luo, Yu, additional, Ueda, Kiyoshi, additional, Fujise, Hikaru, additional, Hishikawa, Akiyoshi, additional, Ibrahim, Heide, additional, Légaré, François, additional, Johnsson, Per, additional, Peschel, Jasper, additional, Simpson, Emma R., additional, Olofsson, Anna, additional, Mauritsson, Johan, additional, Carpeggiani, Paolo Antonio, additional, Maroju, Praveen Kumar, additional, Moioli, Matteo, additional, Ertel, Dominik, additional, Shah, Ronak, additional, Sansone, Giuseppe, additional, Csizmadia, Tamás, additional, Dumergue, Mathieu, additional, Harshitha, N. G., additional, Kühn, Sergei, additional, Callegari, Carlo, additional, Plekan, Oksana, additional, Di Fraia, Michele, additional, Danailov, Miltcho B., additional, Demidovich, Alexander, additional, Giannessi, Luca, additional, Raimondi, Lorenzo, additional, Zangrando, Marco, additional, De Ninno, Giovanni, additional, Ribič, Primož Rebernik, additional, and Prince, Kevin C., additional

Published
2021
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35. DFG-based mid-IR tunable source with 0.5 mJ energy and a 30 pm linewidth

Author

Stoychev, Lyubomir I., primary, Cabrera, Humberto, additional, Suárez-Vargas, Jose J., additional, Baruzzo, Marco, additional, Gadedjisso-Tossou, Komlan S., additional, Nikolov, Ivaylo P., additional, Sigalotti, Paolo, additional, Demidovich, Alexander A., additional, Mocchiutti, Emiliano, additional, Pizzolotto, Cecilia, additional, Niemela, Joseph, additional, Toci, Guido, additional, Danailov, Miltcho B., additional, and Vacchi, Andrea, additional

Published
2020
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36. High-gain harmonic generation with temporally overlapping seed pulses and application to ultrafast spectroscopy

Author

Wituschek, Andreas, primary, Bruder, Lukas, additional, Allaria, Enrico, additional, Bangert, Ulrich, additional, Binz, Marcel, additional, Callegari, Carlo, additional, Cinquegrana, Paolo, additional, Danailov, Miltcho, additional, Demidovich, Alexander, additional, Di Fraia, Michele, additional, Feifel, Raimund, additional, Laarmann, Tim, additional, Michiels, Rupert, additional, Mudrich, Marcel, additional, Nikolov, Ivaylo, additional, Piseri, Paolo, additional, Plekan, Oksana, additional, Charles Prince, Kevin, additional, Przystawik, Andreas, additional, Rebernic Ribič, Primož, additional, Sigalotti, Paolo, additional, Stranges, Stefano, additional, Uhl, Daniel, additional, Giannessi, Luca, additional, and Stienkemeier, Frank, additional

Published
2020
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37. Attosecond pulse shaping using a seeded free-electron laser

Author

Maroju, Praveen Kumar, primary, Grazioli, Cesare, additional, Di Fraia, Michele, additional, Moioli, Matteo, additional, Ertel, Dominik, additional, Ahmadi, Hamed, additional, Plekan, Oksana, additional, Finetti, Paola, additional, Allaria, Enrico, additional, Giannessi, Luca, additional, De Ninno, Giovanni, additional, Spezzani, Carlo, additional, Penco, Giuseppe, additional, Spampinati, Simone, additional, Demidovich, Alexander, additional, Danailov, Miltcho B., additional, Borghes, Roberto, additional, Kourousias, George, additional, Sanches Dos Reis, Carlos Eduardo, additional, Billé, Fulvio, additional, Lutman, Alberto A., additional, Squibb, Richard J., additional, Feifel, Raimund, additional, Carpeggiani, Paolo, additional, Reduzzi, Maurizio, additional, Mazza, Tommaso, additional, Meyer, Michael, additional, Bengtsson, Samuel, additional, Ibrakovic, Neven, additional, Simpson, Emma Rose, additional, Mauritsson, Johan, additional, Csizmadia, Tamás, additional, Dumergue, Mathieu, additional, Kühn, Sergei, additional, Nandiga Gopalakrishna, Harshitha, additional, You, Daehyun, additional, Ueda, Kiyoshi, additional, Labeye, Marie, additional, Bækhøj, Jens Egebjerg, additional, Schafer, Kenneth J., additional, Gryzlova, Elena V., additional, Grum-Grzhimailo, Alexei N., additional, Prince, Kevin C., additional, Callegari, Carlo, additional, and Sansone, Giuseppe, additional

Published
2020
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38. A Novel Attosecond Timing Tool for Free-Electron Laser Experiment

Author

Maroju, Praveen K., primary, Moioli, Matteo, additional, Ertel, Dominik, additional, Ahmadi, Hamed, additional, Sansone, Giuseppe, additional, Grazioli, Cesare, additional, Di Fraia, Michele, additional, Plekan, Oksana, additional, Finetti, Paola, additional, Allaria, Enrico, additional, Giannessi, Luca, additional, Spezzani, Carlo, additional, Penco, Giuseppe, additional, Spampinati, Simone, additional, Demidovich, Alexander, additional, Danailov, Miltcho, additional, Borghes, Roberto, additional, Kourousias, Georgios, additional, Reis, Carlos Eduardo Sanches Dos, additional, Billé, Fulvio, additional, Prince, Kevin C., additional, Callegari, Carlo, additional, De Ninno, Giovanni, additional, Lutman, A., additional, Squibb, Richard J., additional, Feifel, Raimund, additional, Carpeggiani, Paolo, additional, Mazza, Tommaso, additional, Meyer, Michael, additional, Bengtsson, Samuel, additional, Ibrakovic, Neven, additional, Simpson, Emma Rose, additional, Mauritsson, Johan, additional, Csizmadia, Tamás, additional, Dumergue, Mathieu, additional, Kühn, Sergei, additional, Harshitha, N.G., additional, You, Daehyun, additional, Ueda, Kiyoshi, additional, Labeye, Marie, additional, Bækhøj, Jens Egebjerg, additional, Schafer, Kenneth J., additional, Gryzlova, Elena V., additional, and Grum-Grzhimailo, Alexei N., additional

Published
2020
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39. First Lasing of a Free Electron Laser in the Soft X-Ray Spectral Range with Echo Enabled Harmonic Generation

Author

Allaria, Enrico, Abrami, Alessandro, Badano, Laura, Bossi, Maurizio, Braun, Hans-Heinrich, Bruchon, Niky, Capotondi, Flavio, Castronovo, Davide, Cautero, Marco, Cinquegrana, Paolo, Coreno, Marcello, Couprie, Marie-Emmanuelle, Cudin, Ivan, Danailov, Miltcho, De Ninno, Giovanni, Demidovich, Alexander, Di Mitri, Simone, Diviacco, Bruno, Fawley, William, Feng, Chao, Ferianis, Mario, Ferrari, Eugenio, Foglia, Laura, Frassetto, Fabio, Gaio, Giulio, Garzella, David, Ghaith, Amin, Giacuzzo, Fabio, Giannessi, Luca, Grattoni, Vanessa, Grulja, Sandi, Hemsing, Erik, Iazzourene, Fatma, Kurdi, Gabor, Lonza, Marco, Mahne, Nicola, Malvestuto, Marco, Manfredda, Michele, Masciovecchio, Claudio, Miotti, Paolo, Mirian, Najmeh, Nikolov, Ivaylo, Penco, Giuseppe, Penn, Gregory, Poletto, Luca, Pop, Mihai, Prat, Eduard, Principi, Emiliano, Raimondi, Lorenzo, Rebernik Ribič, Primoz, Reiche, Sven, Roussel, Eléonore, Sauro, Roberto, Scafuri, Claudio, Sigalotti, Paolo, Spampinati, Simone, Spezzani, Carlo, Sturari, Luca, Svandrlik, Michele, Tanikawa, Takanori, Trovò, Mauro, Veronese, Marco, Vivoda, Davide, Xiang, Dao, Zaccaria, Maurizio, Zangrando, Dino, Zangrando, Marco, Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 (PhLAM), and Université de Lille-Centre National de la Recherche Scientifique (CNRS)

Subjects
FEL, electron, free-electron laser, experiment, echo enabled harmonic generation, [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], free-electron-laser, Accelerator Physics, First Lasing, laser
Abstract

We report on the successful operation of a Free Electron Laser (FEL) in the Echo Enabled Harmonic Generation (EEHG) scheme at the FERMI facility at Sincrotrone Trieste. The experiment required a modification of the FEL-2 undulator line which, in normal operation, uses two stages of high-gain harmonic generation separated by a delay line. In addition to a new seed laser, the dispersion in the delay-line was increased, the second stage modulator changed and a new manipulator installed in the delay-line chicane hosting additional diagnostic components. With this modified setup we have demonstrated the first evidence of strong exponential gain in a free electron laser operated in EEHG mode at wavelengths as short as 5 nm., Proceedings of the 39th Free Electron Laser Conference, FEL2019, Hamburg, Germany

Published
2019
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40. Status and Perspectives of the FERMI FEL Facility (2019)

Author

Giannessi, Luca, Allaria, Enrico, Badano, Laura, Bassanese, Silvano, Bencivenga, Filippo, Callegari, Carlo, Capotondi, Flavio, Castronovo, Davide, Cilento, Federico, Cinquegrana, Paolo, Coreno, Marcello, Cudin, Ivan, D'Auria, Gerardo, Danailov, Miltcho, De Monte, Raffaele, De Ninno, Giovanni, Delgiusto, Paolo, Demidovich, Alexander, Di Fraia, Michele, Di Mitri, Simone, Diviacco, Bruno, Fabris, Alessandro, Fabris, Riccardo, Fawley, William, Ferianis, Mario, Foglia, Laura, Furlan Radivo, Paolo, Gaio, Giulio, Gelmetti, Federico, Iazzourene, Fatma, Krecic, Stefano, Kurdi, Gabor, Lonza, Marco, Mahne, Nicola, Malvestuto, Marco, Manfredda, Michele, Masciovecchio, Claudio, Milloch, Massimo, Mincigrucci, Riccardo, Mirian, Najmeh, Nikolov, Ivaylo, O'Shea, Finn, Penco, Giuseppe, Perucchi, Andrea, Plekan, Oksana, Predonzani, Mauro, Prince, Kevin, Principi, Emiliano, Raimondi, Lorenzo, Rebernik Ribič, Primoz, Rossi, Fabio, Rumiz, Luca, Scafuri, Claudio, Serpico, Claudio, Shafqat, Nuaman, Sigalotti, Paolo, Simoncig, Alberto, Spampinati, Simone, Spezzani, Carlo, Svandrlik, Michele, Trovò, Mauro, Vascotto, Alessandro, Veronese, Marco, Visintini, Roberto, Zangrando, Dino, and Zangrando, Marco

Subjects
Status of Projects and Facilities, Accelerator Physics
Abstract

FERMI is the seeded Free Electron Laser (FEL) user facility at the Elettra laboratory in Trieste, operating in the VUV to EUV and soft X-rays spectral range; the radiation produced by the seeded FEL is characterized by wavelength stability, low temporal jitter and longitudinal coherence in the range 100-4 nm. During 2018 a dedicated experiment has shown the potential of the Echo Enabled Harmonic Generation (EEHG) scheme [1] to cover most of this spectral range with a single stage cascade [2]. Such a scheme, combined to an increment of the beam energy and of the accelerator performances, could extend the FERMI operating range toward the oxygen k-edge. With this perspective, we present the development plans under consideration for the next 3 to 5 years. These include an upgrade of the linac and of the existing FEL lines, consisting in the conversion of FEL-1 first, and FEL-2 successively, into EEHG seeded FELs., Proceedings of the 39th Free Electron Laser Conference, FEL2019, Hamburg, Germany

Published
2019
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41. Status and Perspectives of the FERMI FEL Facility

Author

Giannessi, Luca, Allaria, Enrico, Badano, Laura, Bencivenga, Filippo, Callegari, Carlo, Capotondi, Flavio, Cilento, Federico, Cinquegrana, Paolo, Coreno, Marcello, Cudin, Ivan, D'Auria, Gerardo, Danailov, Miltcho, De Monte, Raffaele, De Ninno, Giovanni, Delgiusto, Paolo, Demidovich, Alexander, Di Fraia, Michele, Di Mitri, Simone, Diviacco, Bruno, Fabris, Alessandro, Fabris, Riccardo, Fawley, William, Ferianis, Mario, Furlan Radivo, Paolo, Gaio, Giulio, Gauthier, David, Gelmetti, Federico, Iazzourene, Fatma, Krecic, Stefano, Lonza, Marco, Mahne, Nicola, Malvestuto, Marco, Masciovecchio, Claudio, Milloch, Massimo, Mirian, Najmeh, Parmigiani, Fulvio, Penco, Giuseppe, Perucchi, Andrea, Pivetta, Lorenzo, Plekan, Oksana, Predonzani, Mauro, Principi, Emiliano, Raimondi, Lorenzo, Rebernik Ribič, Primoz, Rossi, Fabio, Roussel, Eléonore, Rumiz, Luca, Scafuri, Claudio, Serpico, Claudio, Sigalotti, Paolo, Spampinati, Simone, Spezzani, Carlo, Svandrlik, Michele, Trovò, Mauro, Vascotto, Alessandro, Veronese, Marco, Visintini, Roberto, Zangrando, Dino, and Zangrando, Marco

Subjects
New Lasing & Status of Projects, Accelerator Physics
Abstract

FERMI is the seeded Free Electron Laser (FEL) user facility at the Elettra laboratory in Trieste, operating in the VUV to EUV and soft X-rays spectral range; the radiation produced by the seeded FEL is characterised by a number of desirable properties, such as wavelength stability, low temporal jitter and longitudinal coherence. In this paper, after an overview of the FELs performances, we will present the development plans under consideration for the next 3 to 5 years. These include an upgrade of the LINAC and of the existing FEL lines, the possibility to perform multi-pulse experiments in different configurations and an Echo Enabled Harmonic Generation experiment on FEL-2, the FEL line extending to 4 nm (310 eV)., Proceedings of the 38th Int. Free Electron Laser Conf., FEL2017, Santa Fe, NM, USA

Published
2018
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42. 24 mJ Cr+4:forsterite four-stage master-oscillator power-amplifier laser system for high resolution mid-infrared spectroscopy

Author

Stoychev, Lyubomir I., primary, Cabrera, Humberto, additional, Gadedjisso-Tossou, Komlan S., additional, Vasiliev, Nikolai, additional, Zaporozhchenko, Yuri, additional, Nikolov, Ivaylo P., additional, Sigalotti, Paolo, additional, Demidovich, Alexander A., additional, Suárez-Vargas, José J., additional, Mocchiutti, Emiliano, additional, Pizzolotto, Cecilia, additional, Niemela, Joseph, additional, Baruzzo, Marco, additional, Danailov, Miltcho B., additional, and Vacchi, Andrea, additional

Published
2019
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44. Non-Standard Use of Laser Heater for FEL Control and THz Generation

Author

Allaria, Enrico, Badano, Laura, Danailov, Miltcho, Demidovich, Alexander, Di Mitri, Simone, Gauthier, David, Giannessi, Luca, Penco, Giuseppe, Roussel, Eléonore, Sigalotti, Paolo, Spampinati, Simone, Trovò, Mauro, Veronese, Marco, Synchrotron SOLEIL (SSOLEIL), and Centre National de la Recherche Scientifique (CNRS)

Subjects
FEL, electron, [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], Physics::Optics, Physics::Accelerator Physics, controls, ion, 7. Clean energy, Accelerator Physics, Electron Beam Dynamics, laser
Abstract

The laser heater system is currently used at various FEL facilities for an accurate control of the electron beam energy spread in order to suppress the micro-bunching instabilities that can develop in high brightness electron beams. More recently, studies and experiments have shown that laser-electron interaction developing in the laser heater can open new possibilities for tailoring the electron beam properties to meet special requirements. A suitable time-shaping of the laser heater pulse opened the door to the generation of (tens of) femtosecond-long FEL pulses. Using standard laser techniques it is also possible to imprint onto the electron bunch, energy and density modulations in the THz frequency range that, properly sustained through the accelerator, can be exploited for generation of coherent THz radiation at GeV beam energies. Such recent results at the FERMI FEL are here reported, together with near future plans., Proceedings of the 38th Int. Free Electron Laser Conf., FEL2017, Santa Fe, NM, USA

Published
2017
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45. Control of Seeded FEL Pulse Duration Using Laser Heater Pulse Shaping

Author

Grattoni, Vanessa, Allaria, Enrico, Badano, Laura, Danailov, Miltcho, Demidovich, Alexander, Di Mitri, Simone, Ferrari, Eugenio, Giannessi, Luca, Penco, Giuseppe, Roussel, EléOnore, Sigalotti, Paolo, Spampinati, Simone, Trovò, Mauro, and Veronese, Marco

Subjects
Physics::Accelerator Physics, 02 Photon Sources and Electron Accelerators, Accelerator Physics
Abstract

New Free-Electron Laser facilities deliver VUV and X-ray radiation with pulse length in the range of hundreds and tens of fs. A further reduction of the FEL pulse length is desired by those experiments aiming at probing ultrafast phenomena. Unlike SASE FEL, where the pulse duration is mainly driven by the electron bunch duration, in a seeded FEL the pulse duration can be determined by the seed laser properties. The use of techniques able to locally deteriorate the electron beam properties such as emittance or energy spread have been used in SASE FELs to reduce the region of the electron beam that is able to produce FEL radiation and hence reduce the FEL pulse length. The temporal shaping of the laser heater can be used to create an electron beam characterized by a very large energy spread all along the bunch except for a small region. We report measurements of the effect of the laser heater shaping on the electron beam phase-space performed at FERMI. Impact on the final FEL pulse properties are predicted with a series of numerical simulations., Proceedings of the 8th Int. Particle Accelerator Conf., IPAC2017, Copenhagen, Denmark

Published
2017
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46. Development Perspectives at FERMI

Author

Svandrlik, Michele, Allaria, Enrico, Badano, Laura, Bencivenga, Filippo, Callegari, Carlo, Capotondi, Flavio, Cilento, Federico, Cinquegrana, Paolo, Coreno, Marcello, Cudin, Ivan, D'Auria, Gerardo, Danailov, Miltcho, De Monte, Raffaele, De Ninno, Giovanni, Delgiusto, Paolo, Demidovich, Alexander, Di Fraia, Michele, Di Mitri, Simone, Diviacco, Bruno, Fabris, Alessandro, Fabris, Riccardo, Fawley, William, Ferianis, Mario, Furlan Radivo, Paolo, Gaio, Giulio, Gauthier, David, Gelmetti, Federico, Giannessi, Luca, Iazzourene, Fatma, Krecic, Stefano, Lonza, Marco, Mahne, Nicola, Malvestuto, Marco, Masciovecchio, Claudio, Milloch, Massimo, Parmigiani, Fulvio, Penco, Giuseppe, Perucchi, Andrea, Pivetta, Lorenzo, Plekan, Oksana, Predonzani, Mauro, Principi, Emiliano, Raimondi, Lorenzo, Rebernik Ribič, Primoz, Rossi, Fabio, Roussel, EléOnore, Rumiz, Luca, Scafuri, Claudio, Serpico, Claudio, Sigalotti, Paolo, Trovò, Mauro, Vascotto, Alessandro, Veronese, Marco, Visintini, Roberto, Zangrando, Dino, and Zangrando, Marco

Subjects
02 Photon Sources and Electron Accelerators, Accelerator Physics
Abstract

FERMI is the seeded Free Electron Laser (FEL) user facility at the Elettra laboratory in Trieste, operating in the ultraviolet to soft X-rays spectral range; the radiation produced by the seeded FEL is characterized by a number of desirable properties, such as wavelength stability, low temporal jitter and longitudinal coherence. In this paper, after an overview of the FEL performances, we will present the development plans under consideration for the next 3 to 5 years. These include an upgrade of the linac and of the existing FEL lines, the possibility to perform multipulse experiments in different configurations and an Echo Enabled Harmonic Generation (EEHG) experiment on FEL-2, the FEL line extending to 4 nm (310 eV)., Proceedings of the 8th Int. Particle Accelerator Conf., IPAC2017, Copenhagen, Denmark

Published
2017
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47. Impulsive laser-induced alignment of OCS molecules at FERMI

Author

Di Fraia, Michele, Finetti, Paola, Richter, Robert, Prince, Kevin C., Wiese, Joss, Devetta, Michele, Negro, Matteo, Vozzi, Caterina, Ciriolo, Anna G., Pusala, Aditya, Demidovich, Alexander, Danailov, Miltcho B., Karamatskos, Evangelos T., Trippel, Sebastian, Küpper, Jochen, and Callegari, Carlo

Abstract

We demonstrate the experimental realization of impulsive alignment of carbonyl sulfide (OCS) molecules at the Low Density Matter Beamline (LDM) at the free-electron laser FERMI. OCS molecules in a molecular beam were impulsively aligned using 200 fs pulses from a near-infrared laser. The alignment was probed through time-delayed ionization above the sulphur 2p edge, resulting in multiple ionization via Auger decay and subsequent Coulomb explosion of the molecules. The ionic fragments were collected using a time-of-flight mass spectrometer and the analysis of ion-ion covariance maps confirmed the correlation between fragments after Coulomb explosion. The analysis of the CO+ and S+ channels allowed us to extract the rotational dynamics, which is in agreement with our theoretical description as well as with previous experiments. This result opens the way for a new class of experiments at LDM within the field of coherent control of molecules with the possibilities that a precisely synchronized optical-pump XUV-probe laser setup like FERMI can offer.

Published
2017
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48. Two-bunch operation with ns temporal separation at the FERMI FEL facility

Author

Penco, Giuseppe, primary, Allaria, Enrico, additional, Bassanese, Silvano, additional, Cinquegrana, Paolo, additional, Cleva, Stefano, additional, Danailov, Miltcho B, additional, Demidovich, Alexander, additional, Ferianis, Mario, additional, Gaio, Giulio, additional, Giannessi, Luca, additional, Masciovecchio, Claudio, additional, Predonzani, Mauro, additional, Rossi, Fabio, additional, Roussel, Eleonore, additional, Spampinati, Simone, additional, and Trovò, Mauro, additional

Published
2018
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49. Widely tunable two-colour seeded free-electron laser source for resonant-pump resonant-probe magnetic scattering

Author

Ferrari, Eugenio, Spezzani, Carlo, Fortuna, Franck, Delaunay, Renaud, Vidal, Franck, Nikolov, Ivaylo, Cinquegrana, Paolo, Diviacco, Bruno, Gauthier, David, Penco, Giuseppe, Ribic, Primoz Rebernik, Roussel, Eleonore, Trovo, Marco, Moussy, Jean Baptiste, Pincelli, Tommaso, Lounis, Lounès, Manfredda, Michele, Pedersoli, Emanuele, Capotondi, Flavio, Svetina, Cristian, Mahne, Nicola, Zangrando, Marco, Raimondi, Lorenzo, Demidovich, Alexander, Giannessi, Luca, De Ninno, Giovanni, Danailov, Miltcho Boyanov, Allaria, Enrico, Sacchi, Maurizio, Elettra Sincrotrone Trieste, ELETTRA Sincrotrone Trieste, Dipartimento di Fisica ( DIPARTIMENTO DI FISICA ), Università degli studi di Trieste, Laboratoire de Physique des Solides ( LPS ), Université Paris-Sud - Paris 11 ( UP11 ) -Centre National de la Recherche Scientifique ( CNRS ), Centre de Sciences Nucléaires et de Sciences de la Matière ( CSNSM ), Université Paris-Sud - Paris 11 ( UP11 ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de Chimie Physique - Matière et Rayonnement ( LCPMR ), Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Centre National de la Recherche Scientifique ( CNRS ), Croissance et propriétés de systèmes hybrides en couches minces ( INSP-E8 ), Institut des Nanosciences de Paris ( INSP ), Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Centre National de la Recherche Scientifique ( CNRS ) -Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Centre National de la Recherche Scientifique ( CNRS ), Service de physique de l'état condensé ( SPEC - UMR3680 ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay-Centre National de la Recherche Scientifique ( CNRS ), Dipartimento di Fisica (Milano), Università degli studi di Milano [Milano], École normale supérieure - Paris ( ENS Paris ), Graduate School of Nanotechnology, CNR - Istituto Officina dei Materiali ( IOM ), Consiglio Nazionale delle Ricerche [Roma] ( CNR ), Italian National agency for new technologies, Energy and sustainable economic development [Frascati] ( ENEA ), Laboratory of Quantum Optics, University of Nova Gorica, Synchrotron SOLEIL ( SSOLEIL ), Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de Physique des Solides (LPS), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), CSNSM PS2, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Chimie Physique - Matière et Rayonnement (LCPMR), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Croissance et propriétés de systèmes hybrides en couches minces (INSP-E8), Institut des Nanosciences de Paris (INSP), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 (PhLAM), Université de Lille-Centre National de la Recherche Scientifique (CNRS), Laboratoire Nano-Magnétisme et Oxydes (LNO), Service de physique de l'état condensé (SPEC - UMR3680), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, PSL Research University (PSL), CNR Istituto Officina dei Materiali (IOM), Consiglio Nazionale delle Ricerche [Roma] (CNR), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Dipartimento di Fisica [Trieste], Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université Pierre et Marie Curie - Paris 6 (UPMC), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Università degli Studi di Milano [Milano] (UNIMI), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL), Italian National agency for new technologies, Energy and sustainable economic development [Frascati] (ENEA), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], Science, General Physics and Astronomy, Physics::Optics, 02 engineering and technology, Electron, 01 natural sciences, 7. Clean energy, Article, General Biochemistry, Genetics and Molecular Biology, law.invention, Optics, Optical physics, law, 0103 physical sciences, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], 010306 general physics, Physics, [PHYS]Physics [physics], Range (particle radiation), Multidisciplinary, [ PHYS ] Physics [physics], business.industry, Scattering, Free-electron laser, General Chemistry, 021001 nanoscience & nanotechnology, Laser, Physical sciences, Applied physics, Wavelength, Extreme ultraviolet, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Optoelectronics, Physics::Accelerator Physics, 0210 nano-technology, business
Abstract

The advent of free-electron laser (FEL) sources delivering two synchronized pulses of different wavelengths (or colours) has made available a whole range of novel pump–probe experiments. This communication describes a major step forward using a new configuration of the FERMI FEL-seeded source to deliver two pulses with different wavelengths, each tunable independently over a broad spectral range with adjustable time delay. The FEL scheme makes use of two seed laser beams of different wavelengths and of a split radiator section to generate two extreme ultraviolet pulses from distinct portions of the same electron bunch. The tunability range of this new two-colour source meets the requirements of double-resonant FEL pump/FEL probe time-resolved studies. We demonstrate its performance in a proof-of-principle magnetic scattering experiment in Fe–Ni compounds, by tuning the FEL wavelengths to the Fe and Ni 3p resonances., Two-colour X-ray free electron laser is a powerful tool for pump–probe measurements, but currently constrained by limited tunability. Here, Ferrari et al. develop a configuration that allows tuning both the pump and the probe to specific electronic excitations, providing element selectivity.

Published
2016
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50. Optical setup for two-colour experiments at the low density matter beamline of FERMI

Author

Finetti, Paola, primary, Demidovich, Alexander, additional, Plekan, Oksana, additional, Fraia, Michele Di, additional, Cucini, Riccardo, additional, Callegari, Carlo, additional, Cinquegrana, Paolo, additional, Sigalotti, Paolo, additional, Ivanov, Rosen, additional, Danailov, Miltcho B, additional, Fava, Claudio, additional, De Ninno, Giovanni, additional, Coreno, Marcello, additional, Grazioli, Cesare, additional, Feifel, Raimund, additional, Squibb, Richard J, additional, Mazza, Tommaso, additional, Meyer, Michael, additional, and Prince, Kevin C, additional

Published
2017
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