title: Generation of Phase-Locked Pulses from a Seeded Free-Electron Laser.
abstract: In a coherent control experiment, light pulses are used to guide the real-time evolution of a quantum system. This requires the coherence and the control of the pulses' electric-field carrier waves. In this work, we use frequency-domain interferometry to demonstrate the mutual coherence of time-delayed pulses generated by an extreme ultraviolet seeded free-electron laser. Furthermore, we use the driving seed laser to lock and precisely control the relative phase between the two free-electron laser pulses. This new capability opens the way to a multitude of coherent control experiments, which will take advantage of the high intensity, short wavelength, and short duration of the pulses generated by seeded free-electron lasers.
authors.affiliation: Elettra-Sincrotrone Trieste, Strada Statale 14-km 163,5, 34149 Basovizza, Trieste, Italy.
authors.forename: David
authors.initials: D
authors.lastname: Gauthier
authors.affiliation: Elettra-Sincrotrone Trieste, Strada Statale 14-km 163,5, 34149 Basovizza, Trieste, Italy.
authors.forename: Primož Rebernik
authors.initials: PR
authors.lastname: Ribič
authors.affiliation: Elettra-Sincrotrone Trieste, Strada Statale 14-km 163,5, 34149 Basovizza, Trieste, Italy.|Laboratory of Quantum Optics, University of Nova Gorica, 5001 Nova Gorica, Slovenia.
authors.forename: Giovanni
authors.initials: G
authors.lastname: De Ninno
authors.affiliation: Elettra-Sincrotrone Trieste, Strada Statale 14-km 163,5, 34149 Basovizza, Trieste, Italy.
authors.forename: Enrico
authors.initials: E
authors.lastname: Allaria
authors.affiliation: Elettra-Sincrotrone Trieste, Strada Statale 14-km 163,5, 34149 Basovizza, Trieste, Italy.
authors.forename: Paolo
authors.initials: P
authors.lastname: Cinquegrana
authors.affiliation: Elettra-Sincrotrone Trieste, Strada Statale 14-km 163,5, 34149 Basovizza, Trieste, Italy.
authors.forename: Miltcho Bojanov
authors.initials: MB
authors.lastname: Danailov
authors.affiliation: Elettra-Sincrotrone Trieste, Strada Statale 14-km 163,5, 34149 Basovizza, Trieste, Italy.
authors.forename: Alexander
authors.initials: A
authors.lastname: Demidovich
authors.affiliation: Elettra-Sincrotrone Trieste, Strada Statale 14-km 163,5, 34149 Basovizza, Trieste, Italy.|Università degli Studi di Trieste, Dipartimento di Fisica, Piazzale Europa 1, 34100 Trieste, Italy.
authors.forename: Eugenio
authors.initials: E
authors.lastname: Ferrari
authors.affiliation: Elettra-Sincrotrone Trieste, Strada Statale 14-km 163,5, 34149 Basovizza, Trieste, Italy.|Theory Group ENEA Frascati, Via Enrico Fermi 45, 00044 Frascati, Italy.
authors.forename: Luca
authors.initials: L
authors.lastname: Giannessi