Attosecond Pulse-shaping using a seeded free-electron laser
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 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 (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.
Cite
@article{arxiv.2012.09714,
title = {Attosecond Pulse-shaping using a seeded free-electron laser},
author = {Praveen Kumar Maroju and Cesare Grazioli and Michele Di Fraia and Matteo Moioli and Dominik Ertel and Hamed Ahmadi and Oksana Plekan and Paola Finetti and Enrico Allaria and Luca Giannessi and Giovanni De Ninno and Carlo Spezzani and Giuseppe Penco and Alexander Demidovich and Miltcho Danailov and Roberto Borghes and Georgios Kourousias and Carlos Eduardo Sanches Dos Reis and Fulvio Billé and Alberto A. Lutman and Richard J. Squibb and Raimund Feifel and Paolo Carpeggiani and Maurizio Reduzzi and Tommaso Mazza and Michael Meyer and Samuel Bengtsson and Neven Ibrakovic and Emma Rose Simpson and Johan Mauritsson and Tamás Csizmadia and Mathieu Dumergue and Sergei Kühn and Harshitha N. G. and Daehyun You and Kiyoshi Ueda and Marie Labeye and Jens Egebjerg Bækhøj and Kenneth J. Schafer and Elena V. Gryzlova and Alexei N. Grum-Grzhimailo and Kevin C. Prince and Carlo Callegari and Giuseppe Sansone},
journal= {arXiv preprint arXiv:2012.09714},
year = {2020}
}