Attosecond Metrology at FEM FERMI

Speaker: Dr. Praveeen Kumar Maroju

Program Description
Over the years, several advancements in free-electron laser (FEL) technologies pushed FELs to be ideal radiation sources with unprecedented intensities in extreme ultraviolet (XUV) to hard x-ray spectral regimes with pulses as short as a few to few tens of femtoseconds1-4. However, the generation of attosecond pulses remained elusive at the FEL facilities until recently 5,6. In this talk, I will present the generation, characterization and shaping of the reproducible attosecond pulsetrains (APTs) at the seeded FEL FERMI. I will also discuss the unique capability of FEL FERMI to generate multiple phase-locked harmonics (consecutive and/or non-consecutive) of a seed laser, enabling the generation of tailored APTs with spectral selectivity to match specific experimental requirements

References1. Ackermann, W. et al. Nat. Photon. 1, 336 (2007)2. Allaria, E. et al. Nat. Photon. 6, 699 (2012)3. Emma, P. et al. Nat. Photon. 4, 641 (2010)4. Marinelli, A. et al. Appl. Phys. Lett. 111, 151101 (2017)5. Duris, J et al. Nat. Photon. 14, 30 (2020)6. Maroju, P.K. et al. Nature 578, 386 (2020