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FM: Fall Meeting

FM 41: Poster: Quantum Sensing

FM 41.22: Poster

Dienstag, 24. September 2019, 16:30–18:30, Tents

Attosecond pulse generation at FERMI FEL — •Praveen Kumar Maroju — Physikalisches Institut, Albert-Ludwigs-Universität Freiburg Hermann-Herder-Straße 3, 79104 Freiburg, Germany

Extreme ultraviolet table-top sources based on high-order harmonic generation (HHG) in gases deliver attosecond pulses (trains and isolated), but at rather low photon flux, due to the intrinsic low-conversion efficiency of the HHG-process. On the other hand, Free Electron Lasers (FELs) deliver femtosecond pulses with energies up to the mJ-level. However, the majority of FELs operating in the XUV and X-ray spectral range are based on the self-amplified spontaneous emission (SASE) mechanism, resulting in a poor longitudinal coherence. Recently the temporal coherence between two harmonics of the same seed wavelength, was demonstrated at the seeded-FEL FERMI[1]. This experiment suggested the possibility to synthetize a comb of phase-locked frequencies, which should correspond in the time domain to a train of attosecond pulses. In this work we demonstrate for the first time the attosecond pulse train generation and characterisation at the FERMI FEL along with independent amplitude and phase control.

References:

1. K. C. Prince et al., Nat. Photonics 10, 176, (2016)